GTAW Surfacing: 7 Checks for a Sound Weld Overlay<\/title><meta name=\"description\" content=\"Understand GTAW surfacing, cold- and hot-wire TIG, dilution, alloy choice and weld-overlay acceptance before specifying a cladding system.\"><\/head><br \/>\n<body><\/p>\n<div class=\"seo-blog-content\" style=\"padding:1px 0;\">\n<p>An aesthetically pleasing final surface can mask the wrong chemistry. GTAW surfacing is the deposition of weld metal on a component surface; it allows control over the arc and filler addition, but the important consideration is what remains after machining and inspection. A purchasing specification must correlate the surface with its service requirement.<\/p>\n<p>The seven checks below cover purpose, wire delivery, dilution, process controls, equipment, cost and acceptance. They incorporate published research and public standards. The lab results retain their condition and material, and the purchasing scenarios are illustrative. Use the included worksheets to prepare for an application review with the assigned welding engineer.<\/p>\n<h2 id=\"meaning\" style=\"margin:48px 0 16px;\">What is GTAW surfacing?<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01.png\" alt=\"What is GTAW surfacing? \u2014 Aubrik\" class=\"wp-image-4829\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>GTAW surfacing adds weld metal to a component in order to modify the surface properties or restore the dimension. Gas tungsten arc welding uses a non-consumable tungsten electrode to create an electric arc. Separately supplied filler metal forms the overlay, while shielding gas shields the molten weld from the surrounding air.<\/p>\n<p>The GTAW process is another name for the TIG process, or tungsten inert gas welding. In this case, it’s the electrode that supplies the arc, not the alloy that’s being deposited. Argon shielding gas is familiar in most TIG applications, where the qualified welding application determines the gas and its delivery. <a href=\"https:\/\/obis.osha.gov\/Publications\/OSHA_FS-3647_Welding.html\" rel=\"nofollow noopener\" target=\"_blank\">OSHA’s welding process summary<\/a> defines the external gas shield and non-consumable electrode.<\/p>\n<p>An overlay weld in fusion adds a working surface. Weld joints join adjacent surfaces. Weld penetration determines the depth of the resulting weld and must establish the required fusion. Substrate melting affects the composition of the weld. Therefore, an overlay with a lot of weld penetration won’t automatically produce a better weld.<\/p>\n<p><\/p>\n<p>Let’s look at a valve bore exposed to a corrosive fluid. The bore drawing should give finished-surface information after machining, applicable alloy information, and the acceptance criteria. If the only note is ‘TIG weld’, then the decisions are undefined by the execution presented. Applications of GTAW include joining stainless steel and non-ferrous metals, but the demonstration of joining isn’t sufficient to answer this overlay question.<\/p>\n<p>For an illustrative cross-section, 2 mm\u00b2 of melted substrate within 20 mm\u00b2 of total fused area gives 10% geometric dilution. Those areas describe mixing geometry. Establishing an acceptable GTAW overlay still requires finishing layer measurement; the area of fused geometry is insufficient to define the surface chemistry of the valve.<\/p>\n<h2 id=\"purpose\" style=\"margin:48px 0 16px;\">Match the overlay alloy to the failure mechanism<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02.png\" alt=\"Match the overlay alloy to the failure mechanism \u2014 Aubrik\" class=\"wp-image-4830\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>For a surfacing weld, the function it will perform must be defined in order to select an alloy or machine. The acceptability criteria for corrosion resistant welds, wear resistant welds and buildup welds are all different. Hardfacing welds don’t by themselves demonstrate corrosion resistance, and repair of a worn dimension doesn’t demonstrate that the repaired component is suitable for service.<\/p>\n<p>There’s some overlap in the terminology of the quotations. The following classification matrix isn’t a list of approved materials or required tests, but more of a tool to answer the questions behind the terminology.<\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table id=\"purpose-matrix\" style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Surfacing terms and the requirement each should trigger<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Term or job type<\/th>\n<th scope=\"col\">Main question<\/th>\n<th scope=\"col\">Evidence to request<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Corrosion-resistant overlay<\/th>\n<td>What environment reaches the surface?<\/td>\n<td>Specified chemistry and relevant corrosion acceptance<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Wear-resistant hardfacing<\/th>\n<td>What wear mechanism dominates?<\/td>\n<td>Material selection tied to that mechanism<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Dimensional buildup<\/th>\n<td>What geometry must be restored?<\/td>\n<td>Repair basis and final dimensions<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Buttering<\/th>\n<td>What subsequent weld must it accommodate?<\/td>\n<td>Applicable joining and qualification route<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Internal-bore cladding<\/th>\n<td>Can the full bore be reached?<\/td>\n<td>Access and inspection demonstration<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">External cylindrical overlay<\/th>\n<td>How is continuous travel maintained?<\/td>\n<td>Workholding and coordinated motion trial<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Localized repair deposit<\/th>\n<td>What damage surrounds the repair?<\/td>\n<td>Approved repair extent and assessment<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Single-layer proposal<\/th>\n<td>Does the finished layer meet requirements?<\/td>\n<td>Measurements at the specified surface<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Multilayer proposal<\/th>\n<td>What changes between successive layers?<\/td>\n<td>Layer sequence and final acceptance records<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><\/p>\n<p>A worn shaft has a different purchasing problem from a valve bore. Restoring the diameter may require a repair assessment before choosing the filler wire. Who approves the repair route and releases the component? The alloy designation doesn’t help here.<\/p>\n<p><a href=\"https:\/\/www.iso.org\/standard\/57926.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO 15614-7:2016’s public scope<\/a> covers overlay procedure qualification, while routing buildup and repair of parent metal to ISO 15613 or ISO 15614-1. Its dissimilar-material buttering provision also points to Part 1. Applicability belongs to the project specification and responsible engineer.<\/p>\n<p>The 12.7 mm plate used in a laboratory cladding trial is a research substrate and not a qualified thickness range for a shaft repair. Maintaining this distinction will discourage a buyer from interpreting a material sample to mean that a different component, damage severity, or repair method is acceptable.<\/p>\n<h2 id=\"wire\" style=\"margin:48px 0 16px;\">Cold-wire and hot-wire GTAW: where the tradeoff changes<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03.png\" alt=\"Cold-wire and hot-wire GTAW: where the tradeoff changes \u2014 Aubrik\" class=\"wp-image-4831\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>When the filler wire remains cold, the welding arc melts the filler. With hot wire, resistance heating is commonly used to heat the wire before it reaches the weld pool. Separating the demand for heating the wire from the arc heating demand can increase the rate of melting, but the advantage is dependent upon the welding procedure.<\/p>\n<div class=\"ecc-versus\" style=\"display:flex;flex-wrap:wrap;gap:16px;margin:30px 0;\">\n<div class=\"ecc-versus-col\" style=\"flex:1;min-width:250px;padding:20px 22px;background:#f5f5f5;border:1px solid #e0e0e0;\"><strong class=\"ecc-versus-title\">Cold-wire GTAW<\/strong><\/p>\n<ul>\n<li>Arc melts the incoming filler wire.<\/li>\n<li>Wire addition must remain compatible with the weld pool.<\/li>\n<li>Compare accepted coverage and finishing time.<\/li>\n<\/ul>\n<\/div>\n<div class=\"ecc-versus-col\" style=\"flex:1;min-width:250px;padding:20px 22px;background:#fff;border:1px solid #e0e0e0;\"><strong class=\"ecc-versus-title\">Hot-wire GTAW<\/strong><\/p>\n<ul>\n<li>Additional heating preheats the filler wire.<\/li>\n<li>Wire heating and arc behavior need coordinated control.<\/li>\n<li>Compare accepted coverage and finishing time.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>It’s easy to draw incorrect conclusions from deposition rate data. In particular, the study conducted by <a href=\"https:\/\/www.scielo.br\/j\/si\/a\/hZtYWpPhF93xPVFRMSStzLr\/?lang=en\" rel=\"nofollow noopener\" target=\"_blank\">Egerland and colleagues (2015)<\/a>, a team including Fronius-associated researchers, looked at single- and dual-cathode cases. By changing the number of electrodes and wires, the comparison is also changed. The best rate of one arrangement isn’t a direct comparison of hot-wire versus cold-wire cases.<\/p>\n<p>Where applicable, gas metal arc welding should be considered. The <a href=\"https:\/\/rave.ohiolink.edu\/etdc\/view?acc_num=osu1620613360761292\" rel=\"nofollow noopener\" target=\"_blank\">public abstract of Babyak\u2019s 2021 Ohio State thesis<\/a> reports on optimized cold metal transfer trials of nickel alloys 625, 686, and 825 on X65 steel, and challenges the reliance on hot-wire GTAW. They don’t rank every production job or establish another supplier’s capability.<\/p>\n<p><\/p>\n<p>Ask a supplier that has quoted higher weld deposition rates to show the desired geometry and inspection needs. The constraint of motion will be different for travel and orbital GTAW compared to manual GTAW. Orbital welding equipment used for joining the end of pipes isn’t automatically suited to cover a bore surface.<\/p>\n<h3 style=\"margin:32px 0 12px;\">Compare arc welding processes on a common trial<\/h3>\n<p>A useful benchmark begins with the same starting substrate with the same finished coverage and acceptance requirements. Indicate the filler consumed and the material removed during machining, and include the welding time. If competitor trials yield different finished thicknesses, state that difference prior to determining productivity. Otherwise, the apparent better performer may have simply completed a lesser portion of the task.<\/p>\n<p>What weld defects does the suggested examination reveal and what coverage does it provide? Neither the phrase \u201chigh-quality welds\u201d nor the photograph provides this information. If a supplier intends to modify the process following the trial, refer that change back to the responsible engineer for qualification and acceptance review. That assessment is part of selecting a process for production, and isn’t evidence that all other alternatives are inferior.<\/p>\n<p>Egerland’s trial used 1.2 mm nickel-alloy wire and aimed for approximately 2.5 mm of deposit for each layer in a two layer build. These dimensions are part of the build design. When comparing hot wire weld offers, a potential buyer should request the actual layer build plan and finish allowance for the part in question prior to accepting a rate of deposition comparison.<\/p>\n<h2 id=\"dilution\" style=\"margin:48px 0 16px;\">Read dilution together with finished weld chemistry<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04.png\" alt=\"Read dilution together with finished weld chemistry \u2014 Aubrik\" class=\"wp-image-4832\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>The term dilution describes the contribution of the melted substrate to the deposited weld metal, but reported percentages can be based on different measurements. A geometric cross-section ratio and a measured iron fraction can’t be interchanged. Note the method, sampling position and surface condition before deciding if a dilution figure supports the overlay\u2019s acceptance requirements.<\/p>\n<h3 style=\"margin:32px 0 12px;\">The 2\/20 example: geometry cannot supply chemistry<\/h3>\n<p>Suppose a prepared cross-section contains 2 mm\u00b2 of melted base metal and 18 mm\u00b2 of deposited material above the original surface. Total fused area is 20 mm\u00b2. The illustrative area ratio is 2 \u00f7 20 \u00d7 100 = 10%. It isn’t a measured 10% iron content. Composition also depends on the materials being mixed.<\/p>\n<p>Sampling provides additional clarification. A bulk sample means local variations can be concealed. For instance, by machining, different depths from the as-deposited surface can be exposed. Determine which location of the surface will be in service. The purchaser\u2019s comment, \u201cthe report already says low dilution,\u201d is explained by looking at what the report actually measured.<\/p>\n<p><\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Reported single-bead geometry in da Cruz et al. (2026), Results 3.1<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Measurement<\/th>\n<th scope=\"col\">Cold-wire<\/th>\n<th scope=\"col\">Indirect hot-wire<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Bead width<\/th>\n<td>5.8 mm<\/td>\n<td>6.1 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Reinforcement height<\/th>\n<td>1.0 mm<\/td>\n<td>1.2 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Average penetration depth<\/th>\n<td>0.5 mm<\/td>\n<td>0.3 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Geometric dilution<\/th>\n<td>26.7%<\/td>\n<td>19.8%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The <a href=\"https:\/\/www.mdpi.com\/2076-3417\/16\/3\/1527\" rel=\"nofollow noopener\" target=\"_blank\">2026 experiment<\/a> used A516 Gr.70 substrate and ER385\/904L filler, with four specimens per condition. Its conclusion rounds the dilution values differently, and some operating-parameter labels conflict. The table reports the Results section; it supplies neither a production recipe nor proof that hot-wire always improves corrosion resistance.<\/p>\n<p>In the specific material that was studied, dilution dropped from 26.7% to 19.8%, and there was a change in bead shape. Either of these changes would lose the conditions of the study if we were to treat either of these percentages as universal acceptance criteria. For a purchased overlay, tie the specified chemistry and the required remaining thickness to the finish-machined surface and the agreed sampling method.<\/p>\n<h2 id=\"controls\" style=\"margin:48px 0 16px;\">Control the weld pool without treating settings as a recipe<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05.png\" alt=\"Control the weld pool without treating settings as a recipe \u2014 Aubrik\" class=\"wp-image-4833\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>A GTAW overlay procedure requires control of the arc energy, travel, filler and thermal history. Recording only heat input conceals various combinations of weld current and travel speed. The contribution of hot-wire energy and its measurement basis should be documented, rather than implicitly included or omitted from an arc-only figure.<\/p>\n<p>The arc current is regulated by a constant-current welding power supply, but this doesn’t fix every feature of the weld. The situation at the weld puddle is also influenced by the arc length and electrode condition and the manner of filler metal introduction. A demonstrated procedure can’t be replaced by a short arc length or pulsed current. Ask for the ranges investigated, the documentation during the production process and the changes that require further review.<\/p>\n<p><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/cra-weld-overlay-influence-of-welding-process-and-parameters-on-dilution-and-corrosion-resistance\" rel=\"nofollow noopener\" target=\"_blank\">TWI’s 2010 Alloy 625 study<\/a> gives a useful warning. At approximately equal heat input, 148 A with 80 mm\/min travel produced about 20% measured Fe fraction, versus 50\u201360% at 208 A with 120 mm\/min. These data refer to C-Mn steel, not recommended welding settings.<\/p>\n<p>The control of shielding must be assessed separately from the power source. The gas shield is affected by the gas flow, the torch access and surrounding conditions. Pulsed current GTAW introduces pulsed current level and timing. Pulsed welding still needs shielding. An attractive weld appearance and a stable arc don’t establish an acceptable atmosphere for the operator.<\/p>\n<p>OSHA has noted oxygen displacement by argon or helium especially in closed environments. The presence of low visible fumes doesn’t eliminate the risk. The relevant site teams are responsible for providing the appropriate controls and required ventilation. This document doesn’t contain step-by-step confined space work instructions nor gas flow rates.<\/p>\n<p>In the TWI comparison, changing 148 A\/80 mm\/min to 208 A\/120 mm\/min preserved approximate heat input but changed measured Fe fraction substantially. The purchasing implication is specific: require current, travel and the hot-wire energy-accounting basis alongside the heat-input record. Equal calculated energy per length does not ensure equal chemistry deposited.<\/p>\n<h2 id=\"equipment\" style=\"margin:48px 0 16px;\">Build the GTAW system around the actual part geometry<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06.png\" alt=\"Build the GTAW system around the actual part geometry \u2014 Aubrik\" class=\"wp-image-4834\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>Choose GTAW equipment based on the surface to be reached and the records to be produced. The welding torch, wire feed, motion axes, workholding and cooling must operate in synchronization along the entire intended path. Demonstrated equipment capability, procedure qualification, and final product acceptance are distinct issues that require their own evidence.<\/p>\n<p>Review clearance along the path for bores, including wire entry and return movement of the torch. For cylindrical parts, review rotation and the transition between adjacent beads. A water-cooled torch requires the cooling arrangement specified for the intended duty. A robot isn’t enough to answer these application questions.<\/p>\n<p>For the GTAW machine proposal, review the power supplies and interfaces. The supplier should explain how the controller manages the arc, wire feed, and separate wire heating. Request production records rather than accepting a list of installed components as a description of process control. Distinguish demonstrations on thin materials from the intended substrate thickness and heat-sink conditions.<\/p>\n<p><a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/could-gtaw-hot-wire-go-mainstream\" rel=\"nofollow noopener\" target=\"_blank\">Allford and Hebble’s 2019 practitioner article<\/a> describes the relationship between torch height, wire impingement and contact-tip distance. Both authors were affiliated with ARC Specialties. Their description supports checking coordinated motion; supplier productivity claims still need a representative trial.<\/p>\n<p><\/p>\n<p>In your hypothetical question about a valve bore, request a review of access based on the drawing and a trial that includes the least accessible area. A flat bench-top demonstration of the welding method leaves the access issue unresolved. The trial ought to make clear what it demonstrates and what remains unexamined.<\/p>\n<p>The motion and workholding categories include Aubrik’s <a href=\"https:\/\/aubrikmc.com\/welding-positioners\/\">positioners for controlled part rotation<\/a> and <a href=\"https:\/\/aubrikmc.com\/welding-manipulators-column-boom\/\">column-and-boom torch support equipment<\/a>. Their public pages don\u2019t cite a procedure qualification for your overlay. The background for the equipment talk is given in the <a href=\"https:\/\/aubrikmc.com\/blog\/how-to-use-a-welding-positioner\/\">guide for using a welding positioner<\/a>.<\/p>\n<p>A study using 1.2 mm filler wire and a water-cooled torch sets out what was tested by its authors, rather than what could be expected of a production cell. Be wary of accepting a similar sounding equipment list until a comparison is done of the part drawing, torch envelope, and required path. Keep the equipment manufacturer’s catalogue description separated from the application demonstration.<\/p>\n<h2 id=\"cost\" style=\"margin:48px 0 16px;\">Compare quotes by accepted overlay, including rework<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07.png\" alt=\"Compare quotes by accepted overlay, including rework \u2014 Aubrik\" class=\"wp-image-4835\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>Comparing quotes for the same quantity, finished geometry and acceptance scope should be done. Arc-on deposition is just part of the cost of an accepted overlay. The preparation, repositioning, machining and inspection can affect the cost, while uncertainty about rework, scrap and first-pass acceptance may remain outside a headline welding price.<\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table id=\"quote-comparison\" style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Illustrative quotation for one identical component; arbitrary currency units<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Included operation<\/th>\n<th scope=\"col\">Quote A<\/th>\n<th scope=\"col\">Quote B<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Welding<\/th>\n<td>400 units<\/td>\n<td>300 units<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Finish machining<\/th>\n<td>150 units<\/td>\n<td>240 units<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Inspection<\/th>\n<td>50 units<\/td>\n<td>80 units<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Subtotal before rework or scrap<\/th>\n<td>600 units<\/td>\n<td>620 units<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>For the (imagined) figures, 400 + 150 + 50 = 600 units, while 300 + 240 + 80 = 620 units. The cheaper welding line doesn’t give the cheaper subtotal. Neither of these subtotals proves a cost per accepted part. Specify whether the supplier or purchaser covers the costs of inspections and repairs of failed parts.<\/p>\n<p>Actual production accounting is done by dividing the total batch cost agreed, including the allocated rework and scrap costs, by the accepted output. State what the numerator includes. Don’t divide a quote that already guarantees accepted delivery by yield again; that can double-count failure costs.<\/p>\n<p id=\"bottleneck-map\">Disentangle the hidden bottleneck by timing each step in preparation, arc deposition, movement, machining, and inspection separately. If machining is the constraint, an increase in deposition rate may not improve delivery. <a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/better-cladding-better-inspection\" rel=\"nofollow noopener\" target=\"_blank\">Kahlich’s 2010 cladding discussion<\/a>, written from the perspective of ARC Specialties, notes that finishing and repair should be addressed.<\/p>\n<p>In both Quote A, representing 600 units, and Quote B, representing 620 units, rework and scrap are excluded. A fair buying decision requires the same agreement on cost scope, acceptance criteria, and quantity, with first-pass yield uncertainty disclosed. Compare the costs with demonstrated capacity and delivery time; no single subtotal establishes the best welding process.<\/p>\n<h2 id=\"acceptance\" style=\"margin:48px 0 16px;\">Use an overlay acceptance matrix before the production run<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08.png\" alt=\"Use an overlay acceptance matrix before the production run \u2014 Aubrik\" class=\"wp-image-4836\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>Each requirement is linked to a measurement, location, and decision-maker in an overlay acceptance matrix. This aids a purchaser in differentiating qualification of a procedure from production inspection and assessment of service. The matrix shown here is used for a technical review, and the applicable construction code, contract, and responsible engineer determine the specific tests, limits, and release requirements.<\/p>\n<h3 style=\"margin:32px 0 12px;\">Finished-Surface Evidence Chain<\/h3>\n<p>This worksheet is named the Finished-Surface Evidence Chain. Follow the requirement to the exposed surface after machining. Each row must be assigned to an owner; an empty acceptance limit is an unspecified requirement awaiting resolution.<\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table id=\"acceptance-matrix\" style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Acceptance review worksheet; project-specific limits must be supplied<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Requirement<\/th>\n<th scope=\"col\">Record and location<\/th>\n<th scope=\"col\">Proposed owner<\/th>\n<th scope=\"col\">Decision<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Service exposure<\/th>\n<td>Fluid, wear or repair conditions<\/td>\n<td>Design engineer<\/td>\n<td>Approve material basis<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Procedure applicability<\/th>\n<td>Qualification record and covered variables<\/td>\n<td>Welding engineer<\/td>\n<td>Confirm applicable range<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Personnel qualification<\/th>\n<td>Applicable welder or operator records<\/td>\n<td>Welding coordination<\/td>\n<td>Confirm required coverage<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Finished dimensions<\/th>\n<td>Measurement after machining<\/td>\n<td>Dimensional inspection<\/td>\n<td>Compare with drawing<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Remaining overlay<\/th>\n<td>Thickness at specified locations<\/td>\n<td>Quality team<\/td>\n<td>Confirm required minimum<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Deposited chemistry<\/th>\n<td>Method, depth and sample location<\/td>\n<td>Materials engineer<\/td>\n<td>Compare with specification<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Bond and discontinuities<\/th>\n<td>Agreed examination and coverage<\/td>\n<td>Inspection authority<\/td>\n<td>Apply stated acceptance criteria<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Corrosion-test relevance<\/th>\n<td>Method, preparation and exposure<\/td>\n<td>Materials engineer<\/td>\n<td>Confirm what result demonstrates<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Repair and release<\/th>\n<td>Disposition and traceable final record<\/td>\n<td>Authorized release owner<\/td>\n<td>Accept, repair or reject<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<blockquote style=\"margin:24px 0;padding:16px 24px;border-left:3px solid #2d2d2d;background:#f5f5f5;\">\n<p>\u201cBuilding up and repair of parent metal is covered by ISO 15613 or ISO 15614\u20111.\u201d<\/p>\n<footer style=\"margin-top:8px;color:#6b7280;\"> <a href=\"https:\/\/www.iso.org\/standard\/57926.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO, ISO 15614-7:2016 public scope<\/a><\/footer>\n<\/blockquote>\n<p>The distinction quoted prevents silent extension of an overlay procedure approval to a parent-metal repair. Qualification of a procedure and personnel also doesn’t substitute for the product examinations required. A weld quality report should specify which obligation it addresses.<\/p>\n<p>According to <a href=\"https:\/\/store.astm.org\/standards\/g48\" rel=\"nofollow noopener\" target=\"_blank\">ASTM G48-25’s public guidance<\/a>, the chloride test doesn\u2019t assess the propagation of localized corrosion. It only evaluates the initiation of localized corrosion under defined chloride test conditions, without establishing susceptibility in non-chloride environments. It is possible to make a test specimen unrepresentative of the part or weld by grinding or pickling. Make sure to record the method and location of the test, along with the preparation of the specimen.<\/p>\n<p>In the case of valve bores, addressing the objection “the coupon passed” would require investigation as to whether or not the coupon represents the production variables and the final surface. An attractive weld bead, a chemistry result and a laboratory corrosion result answer different questions. It’s the responsibility of the engineer to link those records to the acceptance basis that was defined.<\/p>\n<p>For example, if an illustrative report describes the filler grade, it may fail to describe the depth of the chemistry sample. Return that report for clarification before considering that report as finished-surface evidence. If another report describes a corrosion test result with no specimen preparation, request the preparation record. Neither omission provides any basis to conclude that the overlay failed; both prevent a reviewer from understanding whether the evidence addresses the question that’s under consideration.<\/p>\n<p>For traceable acceptance, require each GTAW weld overlay to retain a link to the corresponding production records and any approved repair disposition. The proposed responsible owners of the worksheet may be changed to match the contract, which should identify an authorized person who can settle a discrepancy. The documents can be collected by Purchasing, while the technical acceptance belongs to the designated competent authority. Agreeing to responsibility for the work prior to manufacturing avoids the confusion of a handover.<\/p>\n<h2 id=\"developments\" style=\"margin:48px 0 16px;\">Assess newer GTAW technology through the same acceptance test<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09.png\" alt=\"Assess newer GTAW technology through the same acceptance test \u2014 Aubrik\" class=\"wp-image-4837\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>New GTAW technology should be assessed through an application-specific comparison. Wire preheating and the use of multiple electrodes combined with coordinated controls may alter the process, but a dated research result isn’t evidence of current availability or suitability for that part. Require the same finished-surface acceptance basis for evaluating a proposed improvement.<\/p>\n<p>The February 2026 da Cruz study on indirect inductive wire heating on 150 \u00d7 150 \u00d7 12.7 mm plates showed some geometric observations, but made some inconsistent reports. Request the underlying trial record when a sales presentation cites a single percentage from that publication. The publication year doesn’t determine if a given welding technology is appropriate, or settle the weld integrity.<\/p>\n<div class=\"ecc-takeaway\" style=\"margin:30px 0;padding:22px 26px;background:#f5f5f5;border:1px solid #e0e0e0;border-left:4px solid #2d2d2d;\"><strong class=\"ecc-takeaway-label\" style=\"display:block;color:#6b7280;margin-bottom:8px;\">Key takeaway<\/strong><\/p>\n<p style=\"margin:0;\">Specify GTAW surfacing around the accepted finished surface. Connect the service requirement to the procedure, representative measurements and production records before comparing equipment or deposition claims.<\/p>\n<\/div>\n<p>For application discussion, review Aubrik\u2019s <a href=\"https:\/\/aubrikmc.com\/cnc-machining-metal-welding-services\/metal-welding-services\/\">metal-welding service scope<\/a> and <a href=\"https:\/\/aubrikmc.com\/contact-us\/\">send the component drawing and overlay requirements<\/a>. Confirm capability and qualification requirements for the job during that review.<\/p>\n<h2 id=\"faq\" style=\"margin:48px 0 16px;\">Frequently Asked Questions About GTAW Surfacing<\/h2>\n<div style=\"margin:20px 0;\">\n<h3>What does GTAW stand for?<\/h3>\n<details>\n<summary>GTAW stands for gas tungsten arc welding.<\/summary>\n<div style=\"padding:12px 20px 16px;\">The name identifies the gas protection and the tungsten electrode for starting the arc. The term TIG welding is another name for the process used in this surfacing discussion. Separately added filler supplies the overlay alloy. The abbreviation names the welding process; it does not specify the filler grade, the thickness of the layer, or the criteria for acceptance of the overlay. These should be part of the drawing and the procedure describing the operation.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>Are GTAW and TIG the same thing?<\/h3>\n<details>\n<summary>Yes. GTAW is the formal process name commonly called TIG; the name alone does not specify wire heating, travel automation or the acceptance requirements for an overlay.<\/summary>\n<div style=\"padding:12px 20px 16px;\">Both terms identify welding performed with a non-consumable tungsten electrode and an external inert shielding gas. \u201cGTAW or TIG\u201d does not indicate whether the system uses cold-wire or hot-wire addition. This does not distinguish manual welding from mechanized travel. When comparing systems, request these details. Autogenous TIG, without added filler, does not deposit the alloy layer discussed in this surfacing article and thus does not provide this overlay.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>Why would a surfacing weld be used?<\/h3>\n<details>\n<summary>A surfacing weld can add a required surface alloy or restore a component’s dimensions, with material choice and acceptance tied to the service conditions and approved repair basis.<\/summary>\n<div style=\"padding:12px 20px 16px;\">This includes a corrosion resistant layer on a suitable substrate, a wear resistant deposit or an approved dimensional repair. Service suitability and performance are dependent on the function. Hardness alone does not demonstrate corrosion resistance, and restoring dimension does not demonstrate service suitability. Process alternatives, including shielded metal arc welding or gas metal arc welding, must be evaluated against the same application requirements rather than selected from their names alone.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>What are the disadvantages of GTAW?<\/h3>\n<details>\n<summary>GTAW can impose deposition, access and control constraints that increase production time, so compare the complete route through finishing and inspection when evaluating the cost of an accepted part.<\/summary>\n<div style=\"padding:12px 20px 16px;\">Attention to detail is important for separate wire delivery, shielding, and precise motion. Hot-wire can increase deposition capability, but also introduces additional heating and coordination. Consider the complete accepted-part route, including finishing and inspection, rather than assuming either manual GTAW or automated hot-wire is cheaper.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>Is weld overlay the same as cladding?<\/h3>\n<details>\n<summary>Weld overlay is one way to apply a cladding layer; procurement terminology can overlap, so a purchase specification should name the deposition process, surface function and acceptance basis.<\/summary>\n<div style=\"padding:12px 20px 16px;\">In this article, cladding refers to the protective layer, while weld overlay refers to the welding deposition of cladding. There are other cladding routes, so the word cladding alone does not define the cladding process. Also, the word surfacing is used more broadly to include hardfacing and dimensional build up. A purchase order should indicate the function of the required surface, the material to be deposited, and the basis of acceptance. Indicate whether the dimensions are referring to the as deposited condition or the finished machined part. Then, describe how the thickness of the remaining layer and the chemistry of the layer will be examined at that point. For repairs or buttering, confirm the appropriate qualification route independently. This differentiates materially different technical obligations.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:32px 0;padding:22px;background:#f5f5f5;border:1px solid #e0e0e0;\">\n<h3>References & Sources<\/h3>\n<ul>\n<li><a href=\"https:\/\/obis.osha.gov\/Publications\/OSHA_FS-3647_Welding.html\" rel=\"nofollow noopener\" target=\"_blank\">OSHA: Controlling Hazardous Fume and Gases during Welding<\/a>, 2013 public fact sheet.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/57926.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO 15614-7:2016<\/a>, public scope and status, reviewed and confirmed in 2022.<\/li>\n<li><a href=\"https:\/\/www.scielo.br\/j\/si\/a\/hZtYWpPhF93xPVFRMSStzLr\/?lang=en\" rel=\"nofollow noopener\" target=\"_blank\">Egerland et al.: Advanced Gas Tungsten Arc Weld Surfacing Current Status and Application<\/a>, 2015; supplier-affiliated primary study.<\/li>\n<li><a href=\"https:\/\/www.mdpi.com\/2076-3417\/16\/3\/1527\" rel=\"nofollow noopener\" target=\"_blank\">da Cruz et al., Applied Sciences 16(3), 1527<\/a>, 2026; indirect hot-wire cladding experiment.<\/li>\n<li><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/cra-weld-overlay-influence-of-welding-process-and-parameters-on-dilution-and-corrosion-resistance\" rel=\"nofollow noopener\" target=\"_blank\">TWI: Influence of welding process and parameters on dilution and corrosion resistance<\/a>, 2010 primary experiment.<\/li>\n<li><a href=\"https:\/\/rave.ohiolink.edu\/etdc\/view?acc_num=osu1620613360761292\" rel=\"nofollow noopener\" target=\"_blank\">Babyak: Corrosion Resistant Weld Overlays for Pipelines, Oil and Gas, and Petrochemical Installations<\/a>, Ohio State University, 2021; public thesis abstract.<\/li>\n<li><a href=\"https:\/\/store.astm.org\/standards\/g48\" rel=\"nofollow noopener\" target=\"_blank\">ASTM G48-25<\/a>, public Scope and Significance and Use.<\/li>\n<li><a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/could-gtaw-hot-wire-go-mainstream\" rel=\"nofollow noopener\" target=\"_blank\">Allford and Hebble: Could GTAW hot-wire go mainstream?<\/a>, 2019; supplier-affiliated practitioner article.<\/li>\n<li><a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/better-cladding-better-inspection\" rel=\"nofollow noopener\" target=\"_blank\">Kahlich: Better cladding, better inspection<\/a>, 2010; supplier-affiliated practitioner article.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p><\/body><br \/>\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>GTAW Surfacing: 7 Checks for a Sound Weld Overlay An aesthetically pleasing final surface can mask the wrong chemistry. GTAW surfacing is the deposition of weld metal on a component surface; it allows control over the arc and filler addition, but the important consideration is what remains after machining and inspection. A purchasing specification must […]<\/p>\n","protected":false},"author":1,"featured_media":4828,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aubrik"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"_links":{"self":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts\/4838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/comments?post=4838"}],"version-history":[{"count":1,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts\/4838\/revisions"}],"predecessor-version":[{"id":4840,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts\/4838\/revisions\/4840"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/media\/4828"}],"wp:attachment":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/media?parent=4838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/categories?post=4838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/tags?post=4838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":4838,"date":"2026-09-08T10:28:40","date_gmt":"2026-09-08T10:28:40","guid":{"rendered":"https:\/\/aubrikmc.com\/?p=4838"},"modified":"2026-09-08T11:01:46","modified_gmt":"2026-09-08T11:01:46","slug":"gtaw-surfacing","status":"publish","type":"post","link":"https:\/\/aubrikmc.com\/pt\/blog\/gtaw-surfacing\/","title":{"rendered":"Superf\u00edcie GTAW: Aceita\u00e7\u00e3o de Processo, Dilui\u00e7\u00e3o e Sobreposi\u00e7\u00e3o"},"content":{"rendered":"

\n
\nGTAW Surfacing: 7 Checks for a Sound Weld Overlay<\/title><meta name=\"description\" content=\"Understand GTAW surfacing, cold- and hot-wire TIG, dilution, alloy choice and weld-overlay acceptance before specifying a cladding system.\"><\/head><br \/>\n<body><\/p>\n<div class=\"seo-blog-content\" style=\"padding:1px 0;\">\n<p>An aesthetically pleasing final surface can mask the wrong chemistry. GTAW surfacing is the deposition of weld metal on a component surface; it allows control over the arc and filler addition, but the important consideration is what remains after machining and inspection. A purchasing specification must correlate the surface with its service requirement.<\/p>\n<p>The seven checks below cover purpose, wire delivery, dilution, process controls, equipment, cost and acceptance. They incorporate published research and public standards. The lab results retain their condition and material, and the purchasing scenarios are illustrative. Use the included worksheets to prepare for an application review with the assigned welding engineer.<\/p>\n<h2 id=\"meaning\" style=\"margin:48px 0 16px;\">What is GTAW surfacing?<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01.png\" alt=\"What is GTAW surfacing? \u2014 Aubrik\" class=\"wp-image-4829\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_01-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>GTAW surfacing adds weld metal to a component in order to modify the surface properties or restore the dimension. Gas tungsten arc welding uses a non-consumable tungsten electrode to create an electric arc. Separately supplied filler metal forms the overlay, while shielding gas shields the molten weld from the surrounding air.<\/p>\n<p>The GTAW process is another name for the TIG process, or tungsten inert gas welding. In this case, it’s the electrode that supplies the arc, not the alloy that’s being deposited. Argon shielding gas is familiar in most TIG applications, where the qualified welding application determines the gas and its delivery. <a href=\"https:\/\/obis.osha.gov\/Publications\/OSHA_FS-3647_Welding.html\" rel=\"nofollow noopener\" target=\"_blank\">OSHA’s welding process summary<\/a> defines the external gas shield and non-consumable electrode.<\/p>\n<p>An overlay weld in fusion adds a working surface. Weld joints join adjacent surfaces. Weld penetration determines the depth of the resulting weld and must establish the required fusion. Substrate melting affects the composition of the weld. Therefore, an overlay with a lot of weld penetration won’t automatically produce a better weld.<\/p>\n<p><\/p>\n<p>Let’s look at a valve bore exposed to a corrosive fluid. The bore drawing should give finished-surface information after machining, applicable alloy information, and the acceptance criteria. If the only note is ‘TIG weld’, then the decisions are undefined by the execution presented. Applications of GTAW include joining stainless steel and non-ferrous metals, but the demonstration of joining isn’t sufficient to answer this overlay question.<\/p>\n<p>For an illustrative cross-section, 2 mm\u00b2 of melted substrate within 20 mm\u00b2 of total fused area gives 10% geometric dilution. Those areas describe mixing geometry. Establishing an acceptable GTAW overlay still requires finishing layer measurement; the area of fused geometry is insufficient to define the surface chemistry of the valve.<\/p>\n<h2 id=\"purpose\" style=\"margin:48px 0 16px;\">Match the overlay alloy to the failure mechanism<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02.png\" alt=\"Match the overlay alloy to the failure mechanism \u2014 Aubrik\" class=\"wp-image-4830\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_02-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>For a surfacing weld, the function it will perform must be defined in order to select an alloy or machine. The acceptability criteria for corrosion resistant welds, wear resistant welds and buildup welds are all different. Hardfacing welds don’t by themselves demonstrate corrosion resistance, and repair of a worn dimension doesn’t demonstrate that the repaired component is suitable for service.<\/p>\n<p>There’s some overlap in the terminology of the quotations. The following classification matrix isn’t a list of approved materials or required tests, but more of a tool to answer the questions behind the terminology.<\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table id=\"purpose-matrix\" style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Surfacing terms and the requirement each should trigger<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Term or job type<\/th>\n<th scope=\"col\">Main question<\/th>\n<th scope=\"col\">Evidence to request<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Corrosion-resistant overlay<\/th>\n<td>What environment reaches the surface?<\/td>\n<td>Specified chemistry and relevant corrosion acceptance<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Wear-resistant hardfacing<\/th>\n<td>What wear mechanism dominates?<\/td>\n<td>Material selection tied to that mechanism<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Dimensional buildup<\/th>\n<td>What geometry must be restored?<\/td>\n<td>Repair basis and final dimensions<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Buttering<\/th>\n<td>What subsequent weld must it accommodate?<\/td>\n<td>Applicable joining and qualification route<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Internal-bore cladding<\/th>\n<td>Can the full bore be reached?<\/td>\n<td>Access and inspection demonstration<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">External cylindrical overlay<\/th>\n<td>How is continuous travel maintained?<\/td>\n<td>Workholding and coordinated motion trial<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Localized repair deposit<\/th>\n<td>What damage surrounds the repair?<\/td>\n<td>Approved repair extent and assessment<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Single-layer proposal<\/th>\n<td>Does the finished layer meet requirements?<\/td>\n<td>Measurements at the specified surface<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Multilayer proposal<\/th>\n<td>What changes between successive layers?<\/td>\n<td>Layer sequence and final acceptance records<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><\/p>\n<p>A worn shaft has a different purchasing problem from a valve bore. Restoring the diameter may require a repair assessment before choosing the filler wire. Who approves the repair route and releases the component? The alloy designation doesn’t help here.<\/p>\n<p><a href=\"https:\/\/www.iso.org\/standard\/57926.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO 15614-7:2016’s public scope<\/a> covers overlay procedure qualification, while routing buildup and repair of parent metal to ISO 15613 or ISO 15614-1. Its dissimilar-material buttering provision also points to Part 1. Applicability belongs to the project specification and responsible engineer.<\/p>\n<p>The 12.7 mm plate used in a laboratory cladding trial is a research substrate and not a qualified thickness range for a shaft repair. Maintaining this distinction will discourage a buyer from interpreting a material sample to mean that a different component, damage severity, or repair method is acceptable.<\/p>\n<h2 id=\"wire\" style=\"margin:48px 0 16px;\">Cold-wire and hot-wire GTAW: where the tradeoff changes<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03.png\" alt=\"Cold-wire and hot-wire GTAW: where the tradeoff changes \u2014 Aubrik\" class=\"wp-image-4831\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_03-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>When the filler wire remains cold, the welding arc melts the filler. With hot wire, resistance heating is commonly used to heat the wire before it reaches the weld pool. Separating the demand for heating the wire from the arc heating demand can increase the rate of melting, but the advantage is dependent upon the welding procedure.<\/p>\n<div class=\"ecc-versus\" style=\"display:flex;flex-wrap:wrap;gap:16px;margin:30px 0;\">\n<div class=\"ecc-versus-col\" style=\"flex:1;min-width:250px;padding:20px 22px;background:#f5f5f5;border:1px solid #e0e0e0;\"><strong class=\"ecc-versus-title\">Cold-wire GTAW<\/strong><\/p>\n<ul>\n<li>Arc melts the incoming filler wire.<\/li>\n<li>Wire addition must remain compatible with the weld pool.<\/li>\n<li>Compare accepted coverage and finishing time.<\/li>\n<\/ul>\n<\/div>\n<div class=\"ecc-versus-col\" style=\"flex:1;min-width:250px;padding:20px 22px;background:#fff;border:1px solid #e0e0e0;\"><strong class=\"ecc-versus-title\">Hot-wire GTAW<\/strong><\/p>\n<ul>\n<li>Additional heating preheats the filler wire.<\/li>\n<li>Wire heating and arc behavior need coordinated control.<\/li>\n<li>Compare accepted coverage and finishing time.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>It’s easy to draw incorrect conclusions from deposition rate data. In particular, the study conducted by <a href=\"https:\/\/www.scielo.br\/j\/si\/a\/hZtYWpPhF93xPVFRMSStzLr\/?lang=en\" rel=\"nofollow noopener\" target=\"_blank\">Egerland and colleagues (2015)<\/a>, a team including Fronius-associated researchers, looked at single- and dual-cathode cases. By changing the number of electrodes and wires, the comparison is also changed. The best rate of one arrangement isn’t a direct comparison of hot-wire versus cold-wire cases.<\/p>\n<p>Where applicable, gas metal arc welding should be considered. The <a href=\"https:\/\/rave.ohiolink.edu\/etdc\/view?acc_num=osu1620613360761292\" rel=\"nofollow noopener\" target=\"_blank\">public abstract of Babyak\u2019s 2021 Ohio State thesis<\/a> reports on optimized cold metal transfer trials of nickel alloys 625, 686, and 825 on X65 steel, and challenges the reliance on hot-wire GTAW. They don’t rank every production job or establish another supplier’s capability.<\/p>\n<p><\/p>\n<p>Ask a supplier that has quoted higher weld deposition rates to show the desired geometry and inspection needs. The constraint of motion will be different for travel and orbital GTAW compared to manual GTAW. Orbital welding equipment used for joining the end of pipes isn’t automatically suited to cover a bore surface.<\/p>\n<h3 style=\"margin:32px 0 12px;\">Compare arc welding processes on a common trial<\/h3>\n<p>A useful benchmark begins with the same starting substrate with the same finished coverage and acceptance requirements. Indicate the filler consumed and the material removed during machining, and include the welding time. If competitor trials yield different finished thicknesses, state that difference prior to determining productivity. Otherwise, the apparent better performer may have simply completed a lesser portion of the task.<\/p>\n<p>What weld defects does the suggested examination reveal and what coverage does it provide? Neither the phrase \u201chigh-quality welds\u201d nor the photograph provides this information. If a supplier intends to modify the process following the trial, refer that change back to the responsible engineer for qualification and acceptance review. That assessment is part of selecting a process for production, and isn’t evidence that all other alternatives are inferior.<\/p>\n<p>Egerland’s trial used 1.2 mm nickel-alloy wire and aimed for approximately 2.5 mm of deposit for each layer in a two layer build. These dimensions are part of the build design. When comparing hot wire weld offers, a potential buyer should request the actual layer build plan and finish allowance for the part in question prior to accepting a rate of deposition comparison.<\/p>\n<h2 id=\"dilution\" style=\"margin:48px 0 16px;\">Read dilution together with finished weld chemistry<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04.png\" alt=\"Read dilution together with finished weld chemistry \u2014 Aubrik\" class=\"wp-image-4832\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_04-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>The term dilution describes the contribution of the melted substrate to the deposited weld metal, but reported percentages can be based on different measurements. A geometric cross-section ratio and a measured iron fraction can’t be interchanged. Note the method, sampling position and surface condition before deciding if a dilution figure supports the overlay\u2019s acceptance requirements.<\/p>\n<h3 style=\"margin:32px 0 12px;\">The 2\/20 example: geometry cannot supply chemistry<\/h3>\n<p>Suppose a prepared cross-section contains 2 mm\u00b2 of melted base metal and 18 mm\u00b2 of deposited material above the original surface. Total fused area is 20 mm\u00b2. The illustrative area ratio is 2 \u00f7 20 \u00d7 100 = 10%. It isn’t a measured 10% iron content. Composition also depends on the materials being mixed.<\/p>\n<p>Sampling provides additional clarification. A bulk sample means local variations can be concealed. For instance, by machining, different depths from the as-deposited surface can be exposed. Determine which location of the surface will be in service. The purchaser\u2019s comment, \u201cthe report already says low dilution,\u201d is explained by looking at what the report actually measured.<\/p>\n<p><\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Reported single-bead geometry in da Cruz et al. (2026), Results 3.1<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Measurement<\/th>\n<th scope=\"col\">Cold-wire<\/th>\n<th scope=\"col\">Indirect hot-wire<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Bead width<\/th>\n<td>5.8 mm<\/td>\n<td>6.1 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Reinforcement height<\/th>\n<td>1.0 mm<\/td>\n<td>1.2 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Average penetration depth<\/th>\n<td>0.5 mm<\/td>\n<td>0.3 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Geometric dilution<\/th>\n<td>26.7%<\/td>\n<td>19.8%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The <a href=\"https:\/\/www.mdpi.com\/2076-3417\/16\/3\/1527\" rel=\"nofollow noopener\" target=\"_blank\">2026 experiment<\/a> used A516 Gr.70 substrate and ER385\/904L filler, with four specimens per condition. Its conclusion rounds the dilution values differently, and some operating-parameter labels conflict. The table reports the Results section; it supplies neither a production recipe nor proof that hot-wire always improves corrosion resistance.<\/p>\n<p>In the specific material that was studied, dilution dropped from 26.7% to 19.8%, and there was a change in bead shape. Either of these changes would lose the conditions of the study if we were to treat either of these percentages as universal acceptance criteria. For a purchased overlay, tie the specified chemistry and the required remaining thickness to the finish-machined surface and the agreed sampling method.<\/p>\n<h2 id=\"controls\" style=\"margin:48px 0 16px;\">Control the weld pool without treating settings as a recipe<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05.png\" alt=\"Control the weld pool without treating settings as a recipe \u2014 Aubrik\" class=\"wp-image-4833\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_05-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>A GTAW overlay procedure requires control of the arc energy, travel, filler and thermal history. Recording only heat input conceals various combinations of weld current and travel speed. The contribution of hot-wire energy and its measurement basis should be documented, rather than implicitly included or omitted from an arc-only figure.<\/p>\n<p>The arc current is regulated by a constant-current welding power supply, but this doesn’t fix every feature of the weld. The situation at the weld puddle is also influenced by the arc length and electrode condition and the manner of filler metal introduction. A demonstrated procedure can’t be replaced by a short arc length or pulsed current. Ask for the ranges investigated, the documentation during the production process and the changes that require further review.<\/p>\n<p><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/cra-weld-overlay-influence-of-welding-process-and-parameters-on-dilution-and-corrosion-resistance\" rel=\"nofollow noopener\" target=\"_blank\">TWI’s 2010 Alloy 625 study<\/a> gives a useful warning. At approximately equal heat input, 148 A with 80 mm\/min travel produced about 20% measured Fe fraction, versus 50\u201360% at 208 A with 120 mm\/min. These data refer to C-Mn steel, not recommended welding settings.<\/p>\n<p>The control of shielding must be assessed separately from the power source. The gas shield is affected by the gas flow, the torch access and surrounding conditions. Pulsed current GTAW introduces pulsed current level and timing. Pulsed welding still needs shielding. An attractive weld appearance and a stable arc don’t establish an acceptable atmosphere for the operator.<\/p>\n<p>OSHA has noted oxygen displacement by argon or helium especially in closed environments. The presence of low visible fumes doesn’t eliminate the risk. The relevant site teams are responsible for providing the appropriate controls and required ventilation. This document doesn’t contain step-by-step confined space work instructions nor gas flow rates.<\/p>\n<p>In the TWI comparison, changing 148 A\/80 mm\/min to 208 A\/120 mm\/min preserved approximate heat input but changed measured Fe fraction substantially. The purchasing implication is specific: require current, travel and the hot-wire energy-accounting basis alongside the heat-input record. Equal calculated energy per length does not ensure equal chemistry deposited.<\/p>\n<h2 id=\"equipment\" style=\"margin:48px 0 16px;\">Build the GTAW system around the actual part geometry<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06.png\" alt=\"Build the GTAW system around the actual part geometry \u2014 Aubrik\" class=\"wp-image-4834\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_06-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>Choose GTAW equipment based on the surface to be reached and the records to be produced. The welding torch, wire feed, motion axes, workholding and cooling must operate in synchronization along the entire intended path. Demonstrated equipment capability, procedure qualification, and final product acceptance are distinct issues that require their own evidence.<\/p>\n<p>Review clearance along the path for bores, including wire entry and return movement of the torch. For cylindrical parts, review rotation and the transition between adjacent beads. A water-cooled torch requires the cooling arrangement specified for the intended duty. A robot isn’t enough to answer these application questions.<\/p>\n<p>For the GTAW machine proposal, review the power supplies and interfaces. The supplier should explain how the controller manages the arc, wire feed, and separate wire heating. Request production records rather than accepting a list of installed components as a description of process control. Distinguish demonstrations on thin materials from the intended substrate thickness and heat-sink conditions.<\/p>\n<p><a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/could-gtaw-hot-wire-go-mainstream\" rel=\"nofollow noopener\" target=\"_blank\">Allford and Hebble’s 2019 practitioner article<\/a> describes the relationship between torch height, wire impingement and contact-tip distance. Both authors were affiliated with ARC Specialties. Their description supports checking coordinated motion; supplier productivity claims still need a representative trial.<\/p>\n<p><\/p>\n<p>In your hypothetical question about a valve bore, request a review of access based on the drawing and a trial that includes the least accessible area. A flat bench-top demonstration of the welding method leaves the access issue unresolved. The trial ought to make clear what it demonstrates and what remains unexamined.<\/p>\n<p>The motion and workholding categories include Aubrik’s <a href=\"https:\/\/aubrikmc.com\/welding-positioners\/\">positioners for controlled part rotation<\/a> and <a href=\"https:\/\/aubrikmc.com\/welding-manipulators-column-boom\/\">column-and-boom torch support equipment<\/a>. Their public pages don\u2019t cite a procedure qualification for your overlay. The background for the equipment talk is given in the <a href=\"https:\/\/aubrikmc.com\/blog\/how-to-use-a-welding-positioner\/\">guide for using a welding positioner<\/a>.<\/p>\n<p>A study using 1.2 mm filler wire and a water-cooled torch sets out what was tested by its authors, rather than what could be expected of a production cell. Be wary of accepting a similar sounding equipment list until a comparison is done of the part drawing, torch envelope, and required path. Keep the equipment manufacturer’s catalogue description separated from the application demonstration.<\/p>\n<h2 id=\"cost\" style=\"margin:48px 0 16px;\">Compare quotes by accepted overlay, including rework<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07.png\" alt=\"Compare quotes by accepted overlay, including rework \u2014 Aubrik\" class=\"wp-image-4835\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_07-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>Comparing quotes for the same quantity, finished geometry and acceptance scope should be done. Arc-on deposition is just part of the cost of an accepted overlay. The preparation, repositioning, machining and inspection can affect the cost, while uncertainty about rework, scrap and first-pass acceptance may remain outside a headline welding price.<\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table id=\"quote-comparison\" style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Illustrative quotation for one identical component; arbitrary currency units<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Included operation<\/th>\n<th scope=\"col\">Quote A<\/th>\n<th scope=\"col\">Quote B<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Welding<\/th>\n<td>400 units<\/td>\n<td>300 units<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Finish machining<\/th>\n<td>150 units<\/td>\n<td>240 units<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Inspection<\/th>\n<td>50 units<\/td>\n<td>80 units<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Subtotal before rework or scrap<\/th>\n<td>600 units<\/td>\n<td>620 units<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>For the (imagined) figures, 400 + 150 + 50 = 600 units, while 300 + 240 + 80 = 620 units. The cheaper welding line doesn’t give the cheaper subtotal. Neither of these subtotals proves a cost per accepted part. Specify whether the supplier or purchaser covers the costs of inspections and repairs of failed parts.<\/p>\n<p>Actual production accounting is done by dividing the total batch cost agreed, including the allocated rework and scrap costs, by the accepted output. State what the numerator includes. Don’t divide a quote that already guarantees accepted delivery by yield again; that can double-count failure costs.<\/p>\n<p id=\"bottleneck-map\">Disentangle the hidden bottleneck by timing each step in preparation, arc deposition, movement, machining, and inspection separately. If machining is the constraint, an increase in deposition rate may not improve delivery. <a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/better-cladding-better-inspection\" rel=\"nofollow noopener\" target=\"_blank\">Kahlich’s 2010 cladding discussion<\/a>, written from the perspective of ARC Specialties, notes that finishing and repair should be addressed.<\/p>\n<p>In both Quote A, representing 600 units, and Quote B, representing 620 units, rework and scrap are excluded. A fair buying decision requires the same agreement on cost scope, acceptance criteria, and quantity, with first-pass yield uncertainty disclosed. Compare the costs with demonstrated capacity and delivery time; no single subtotal establishes the best welding process.<\/p>\n<h2 id=\"acceptance\" style=\"margin:48px 0 16px;\">Use an overlay acceptance matrix before the production run<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08.png\" alt=\"Use an overlay acceptance matrix before the production run \u2014 Aubrik\" class=\"wp-image-4836\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_08-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>Each requirement is linked to a measurement, location, and decision-maker in an overlay acceptance matrix. This aids a purchaser in differentiating qualification of a procedure from production inspection and assessment of service. The matrix shown here is used for a technical review, and the applicable construction code, contract, and responsible engineer determine the specific tests, limits, and release requirements.<\/p>\n<h3 style=\"margin:32px 0 12px;\">Finished-Surface Evidence Chain<\/h3>\n<p>This worksheet is named the Finished-Surface Evidence Chain. Follow the requirement to the exposed surface after machining. Each row must be assigned to an owner; an empty acceptance limit is an unspecified requirement awaiting resolution.<\/p>\n<div style=\"overflow-x:auto;margin:24px 0;\">\n<table id=\"acceptance-matrix\" style=\"width:100%;border-collapse:collapse;\">\n<caption style=\"text-align:left;font-weight:600;\">Acceptance review worksheet; project-specific limits must be supplied<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Requirement<\/th>\n<th scope=\"col\">Record and location<\/th>\n<th scope=\"col\">Proposed owner<\/th>\n<th scope=\"col\">Decision<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th scope=\"row\">Service exposure<\/th>\n<td>Fluid, wear or repair conditions<\/td>\n<td>Design engineer<\/td>\n<td>Approve material basis<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Procedure applicability<\/th>\n<td>Qualification record and covered variables<\/td>\n<td>Welding engineer<\/td>\n<td>Confirm applicable range<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Personnel qualification<\/th>\n<td>Applicable welder or operator records<\/td>\n<td>Welding coordination<\/td>\n<td>Confirm required coverage<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Finished dimensions<\/th>\n<td>Measurement after machining<\/td>\n<td>Dimensional inspection<\/td>\n<td>Compare with drawing<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Remaining overlay<\/th>\n<td>Thickness at specified locations<\/td>\n<td>Quality team<\/td>\n<td>Confirm required minimum<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Deposited chemistry<\/th>\n<td>Method, depth and sample location<\/td>\n<td>Materials engineer<\/td>\n<td>Compare with specification<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Bond and discontinuities<\/th>\n<td>Agreed examination and coverage<\/td>\n<td>Inspection authority<\/td>\n<td>Apply stated acceptance criteria<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Corrosion-test relevance<\/th>\n<td>Method, preparation and exposure<\/td>\n<td>Materials engineer<\/td>\n<td>Confirm what result demonstrates<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Repair and release<\/th>\n<td>Disposition and traceable final record<\/td>\n<td>Authorized release owner<\/td>\n<td>Accept, repair or reject<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<blockquote style=\"margin:24px 0;padding:16px 24px;border-left:3px solid #2d2d2d;background:#f5f5f5;\">\n<p>\u201cBuilding up and repair of parent metal is covered by ISO 15613 or ISO 15614\u20111.\u201d<\/p>\n<footer style=\"margin-top:8px;color:#6b7280;\"> <a href=\"https:\/\/www.iso.org\/standard\/57926.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO, ISO 15614-7:2016 public scope<\/a><\/footer>\n<\/blockquote>\n<p>The distinction quoted prevents silent extension of an overlay procedure approval to a parent-metal repair. Qualification of a procedure and personnel also doesn’t substitute for the product examinations required. A weld quality report should specify which obligation it addresses.<\/p>\n<p>According to <a href=\"https:\/\/store.astm.org\/standards\/g48\" rel=\"nofollow noopener\" target=\"_blank\">ASTM G48-25’s public guidance<\/a>, the chloride test doesn\u2019t assess the propagation of localized corrosion. It only evaluates the initiation of localized corrosion under defined chloride test conditions, without establishing susceptibility in non-chloride environments. It is possible to make a test specimen unrepresentative of the part or weld by grinding or pickling. Make sure to record the method and location of the test, along with the preparation of the specimen.<\/p>\n<p>In the case of valve bores, addressing the objection “the coupon passed” would require investigation as to whether or not the coupon represents the production variables and the final surface. An attractive weld bead, a chemistry result and a laboratory corrosion result answer different questions. It’s the responsibility of the engineer to link those records to the acceptance basis that was defined.<\/p>\n<p>For example, if an illustrative report describes the filler grade, it may fail to describe the depth of the chemistry sample. Return that report for clarification before considering that report as finished-surface evidence. If another report describes a corrosion test result with no specimen preparation, request the preparation record. Neither omission provides any basis to conclude that the overlay failed; both prevent a reviewer from understanding whether the evidence addresses the question that’s under consideration.<\/p>\n<p>For traceable acceptance, require each GTAW weld overlay to retain a link to the corresponding production records and any approved repair disposition. The proposed responsible owners of the worksheet may be changed to match the contract, which should identify an authorized person who can settle a discrepancy. The documents can be collected by Purchasing, while the technical acceptance belongs to the designated competent authority. Agreeing to responsibility for the work prior to manufacturing avoids the confusion of a handover.<\/p>\n<h2 id=\"developments\" style=\"margin:48px 0 16px;\">Assess newer GTAW technology through the same acceptance test<\/h2>\n<figure style=\"margin:28px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09.png\" alt=\"Assess newer GTAW technology through the same acceptance test \u2014 Aubrik\" class=\"wp-image-4837\" width=\"1200\" height=\"800\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:8px;\" srcset=\"https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09.png 1200w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-300x200.png 300w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-1024x683.png 1024w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-768x512.png 768w, https:\/\/aubrikmc.com\/wp-content\/uploads\/2026\/09\/gtaw-surfacing-h2_09-18x12.png 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<p>New GTAW technology should be assessed through an application-specific comparison. Wire preheating and the use of multiple electrodes combined with coordinated controls may alter the process, but a dated research result isn’t evidence of current availability or suitability for that part. Require the same finished-surface acceptance basis for evaluating a proposed improvement.<\/p>\n<p>The February 2026 da Cruz study on indirect inductive wire heating on 150 \u00d7 150 \u00d7 12.7 mm plates showed some geometric observations, but made some inconsistent reports. Request the underlying trial record when a sales presentation cites a single percentage from that publication. The publication year doesn’t determine if a given welding technology is appropriate, or settle the weld integrity.<\/p>\n<div class=\"ecc-takeaway\" style=\"margin:30px 0;padding:22px 26px;background:#f5f5f5;border:1px solid #e0e0e0;border-left:4px solid #2d2d2d;\"><strong class=\"ecc-takeaway-label\" style=\"display:block;color:#6b7280;margin-bottom:8px;\">Key takeaway<\/strong><\/p>\n<p style=\"margin:0;\">Specify GTAW surfacing around the accepted finished surface. Connect the service requirement to the procedure, representative measurements and production records before comparing equipment or deposition claims.<\/p>\n<\/div>\n<p>For application discussion, review Aubrik\u2019s <a href=\"https:\/\/aubrikmc.com\/cnc-machining-metal-welding-services\/metal-welding-services\/\">metal-welding service scope<\/a> and <a href=\"https:\/\/aubrikmc.com\/contact-us\/\">send the component drawing and overlay requirements<\/a>. Confirm capability and qualification requirements for the job during that review.<\/p>\n<h2 id=\"faq\" style=\"margin:48px 0 16px;\">Frequently Asked Questions About GTAW Surfacing<\/h2>\n<div style=\"margin:20px 0;\">\n<h3>What does GTAW stand for?<\/h3>\n<details>\n<summary>GTAW stands for gas tungsten arc welding.<\/summary>\n<div style=\"padding:12px 20px 16px;\">The name identifies the gas protection and the tungsten electrode for starting the arc. The term TIG welding is another name for the process used in this surfacing discussion. Separately added filler supplies the overlay alloy. The abbreviation names the welding process; it does not specify the filler grade, the thickness of the layer, or the criteria for acceptance of the overlay. These should be part of the drawing and the procedure describing the operation.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>Are GTAW and TIG the same thing?<\/h3>\n<details>\n<summary>Yes. GTAW is the formal process name commonly called TIG; the name alone does not specify wire heating, travel automation or the acceptance requirements for an overlay.<\/summary>\n<div style=\"padding:12px 20px 16px;\">Both terms identify welding performed with a non-consumable tungsten electrode and an external inert shielding gas. \u201cGTAW or TIG\u201d does not indicate whether the system uses cold-wire or hot-wire addition. This does not distinguish manual welding from mechanized travel. When comparing systems, request these details. Autogenous TIG, without added filler, does not deposit the alloy layer discussed in this surfacing article and thus does not provide this overlay.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>Why would a surfacing weld be used?<\/h3>\n<details>\n<summary>A surfacing weld can add a required surface alloy or restore a component’s dimensions, with material choice and acceptance tied to the service conditions and approved repair basis.<\/summary>\n<div style=\"padding:12px 20px 16px;\">This includes a corrosion resistant layer on a suitable substrate, a wear resistant deposit or an approved dimensional repair. Service suitability and performance are dependent on the function. Hardness alone does not demonstrate corrosion resistance, and restoring dimension does not demonstrate service suitability. Process alternatives, including shielded metal arc welding or gas metal arc welding, must be evaluated against the same application requirements rather than selected from their names alone.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>What are the disadvantages of GTAW?<\/h3>\n<details>\n<summary>GTAW can impose deposition, access and control constraints that increase production time, so compare the complete route through finishing and inspection when evaluating the cost of an accepted part.<\/summary>\n<div style=\"padding:12px 20px 16px;\">Attention to detail is important for separate wire delivery, shielding, and precise motion. Hot-wire can increase deposition capability, but also introduces additional heating and coordination. Consider the complete accepted-part route, including finishing and inspection, rather than assuming either manual GTAW or automated hot-wire is cheaper.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:20px 0;\">\n<h3>Is weld overlay the same as cladding?<\/h3>\n<details>\n<summary>Weld overlay is one way to apply a cladding layer; procurement terminology can overlap, so a purchase specification should name the deposition process, surface function and acceptance basis.<\/summary>\n<div style=\"padding:12px 20px 16px;\">In this article, cladding refers to the protective layer, while weld overlay refers to the welding deposition of cladding. There are other cladding routes, so the word cladding alone does not define the cladding process. Also, the word surfacing is used more broadly to include hardfacing and dimensional build up. A purchase order should indicate the function of the required surface, the material to be deposited, and the basis of acceptance. Indicate whether the dimensions are referring to the as deposited condition or the finished machined part. Then, describe how the thickness of the remaining layer and the chemistry of the layer will be examined at that point. For repairs or buttering, confirm the appropriate qualification route independently. This differentiates materially different technical obligations.<\/div>\n<\/details>\n<\/div>\n<div style=\"margin:32px 0;padding:22px;background:#f5f5f5;border:1px solid #e0e0e0;\">\n<h3>References & Sources<\/h3>\n<ul>\n<li><a href=\"https:\/\/obis.osha.gov\/Publications\/OSHA_FS-3647_Welding.html\" rel=\"nofollow noopener\" target=\"_blank\">OSHA: Controlling Hazardous Fume and Gases during Welding<\/a>, 2013 public fact sheet.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/57926.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO 15614-7:2016<\/a>, public scope and status, reviewed and confirmed in 2022.<\/li>\n<li><a href=\"https:\/\/www.scielo.br\/j\/si\/a\/hZtYWpPhF93xPVFRMSStzLr\/?lang=en\" rel=\"nofollow noopener\" target=\"_blank\">Egerland et al.: Advanced Gas Tungsten Arc Weld Surfacing Current Status and Application<\/a>, 2015; supplier-affiliated primary study.<\/li>\n<li><a href=\"https:\/\/www.mdpi.com\/2076-3417\/16\/3\/1527\" rel=\"nofollow noopener\" target=\"_blank\">da Cruz et al., Applied Sciences 16(3), 1527<\/a>, 2026; indirect hot-wire cladding experiment.<\/li>\n<li><a href=\"https:\/\/www.twi-global.com\/technical-knowledge\/published-papers\/cra-weld-overlay-influence-of-welding-process-and-parameters-on-dilution-and-corrosion-resistance\" rel=\"nofollow noopener\" target=\"_blank\">TWI: Influence of welding process and parameters on dilution and corrosion resistance<\/a>, 2010 primary experiment.<\/li>\n<li><a href=\"https:\/\/rave.ohiolink.edu\/etdc\/view?acc_num=osu1620613360761292\" rel=\"nofollow noopener\" target=\"_blank\">Babyak: Corrosion Resistant Weld Overlays for Pipelines, Oil and Gas, and Petrochemical Installations<\/a>, Ohio State University, 2021; public thesis abstract.<\/li>\n<li><a href=\"https:\/\/store.astm.org\/standards\/g48\" rel=\"nofollow noopener\" target=\"_blank\">ASTM G48-25<\/a>, public Scope and Significance and Use.<\/li>\n<li><a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/could-gtaw-hot-wire-go-mainstream\" rel=\"nofollow noopener\" target=\"_blank\">Allford and Hebble: Could GTAW hot-wire go mainstream?<\/a>, 2019; supplier-affiliated practitioner article.<\/li>\n<li><a href=\"https:\/\/www.thefabricator.com\/thefabricator\/article\/arcwelding\/better-cladding-better-inspection\" rel=\"nofollow noopener\" target=\"_blank\">Kahlich: Better cladding, better inspection<\/a>, 2010; supplier-affiliated practitioner article.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p><\/body><br \/>\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>GTAW Surfacing: 7 Checks for a Sound Weld Overlay An aesthetically pleasing final surface can mask the wrong chemistry. GTAW surfacing is the deposition of weld metal on a component surface; it allows control over the arc and filler addition, but the important consideration is what remains after machining and inspection. A purchasing specification must […]<\/p>\n","protected":false},"author":1,"featured_media":4828,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aubrik"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"_links":{"self":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts\/4838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/comments?post=4838"}],"version-history":[{"count":1,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts\/4838\/revisions"}],"predecessor-version":[{"id":4840,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/posts\/4838\/revisions\/4840"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/media\/4828"}],"wp:attachment":[{"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/media?parent=4838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/categories?post=4838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aubrikmc.com\/pt\/wp-json\/wp\/v2\/tags?post=4838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}