What Is the Name of TIG Welding? GTAW, Heliarc & More

Quick Note: Military training material makes the point nicely. The U.S. Navy’s NAVEDTRA 14250A steelworker manual explicitly notes that the process is also called TIG welding and, on European deployments, WIG welding. Sailors rotating between fleets had to recognize all three.

Quick Note: TIG and GTAW are not two different processes. They are two names for one identical process — the informal name and the code you will find stamped on procedure specifications and welder qualification records.

Quick Note: In the welding symbol itself, the process name usually goes in the tail of the symbol, where notes like “GTAW,” a specification, or a procedure reference belong. And in international standards, ISO 4063 assigns the numeric code 141 to this process, so a European drawing may identify your TIG weld by number alone.

Quick Note: When an old-timer says “Heliarc,” they are naming the helium-era version of the same process. When a spec sheet says GTAW, it is naming the argon-era, AC-capable version. Same arc, same tungsten, different chapter of the history.

Quick Note: The heat is genuinely intense. ASM International’s Metals Handbook coverage of gas tungsten arc welding puts weld pool temperatures approaching roughly

TIG vs. MIG vs. Stick: How Arc Welding Names Compare

Once you know that TIG welding and GTAW are two names for the same process, a bigger question usually follows: if TIG has an official name, what about every other welder on the floor? The good news is that AWS did not name these processes randomly. Every arc process title follows the same short formula, and once you can see it, you can decode nearly any acronym you meet on a print, a WPS, or a welding symbol without reaching for a glossary.

The AWS Naming Pattern: Shielding, Electrode, Arc

Almost every AWS arc process name reads like a three-part sentence, delivered in reverse order of how you might describe the work:

1. **What shields the weld** (gas, flux, or a coating)
2. **What the electrode is made of** (metal, tungsten, or flux-cored wire)
3. **The word “arc,”** because an electric arc is the heat source

So gas tungsten arc welding means: a gas shields it, a tungsten electrode produces the arc, and the arc does the melting. Swap tungsten for metal and you get gas metal arc welding (GMAW), which the shop floor calls MIG or MAG. The American Welding Society codifies this vocabulary in its standard welding terms and symbols publication, which is why the same words show up consistently across job prints and certification documents (AWS A3.0, Standard Welding Terms and Definitions).

There is a subtlety worth catching here. In American usage, “MIG” is applied loosely to nearly every wire feed process, even when the shielding gas is a CO₂ or argon/CO₂ mixture. European practice is stricter: metal inert gas (MIG) means truly inert shielding such as argon or helium, while metal active gas (MAG) means the gas participates in the arc chemistry, as CO₂-rich blends do. So the same machine set up with 75/25 argon-CO₂ is technically running MAG by European naming, even though most US welders would still say MIG.

Why SMAW and FCAW Break the Pattern

Shielded metal arc welding (SMAW) is the exception that proves the rule. There is no external gas cylinder at all. Instead, the electrode itself is a consumable metal wire coated in flux, and when the arc melts the coating it generates its own shielding gas and slag blanket. That is why the name says shielded instead of gas: the shielding comes from the consumable, not a bottle. The “stick” nickname simply describes the bare end you clamp in the holder, not the physics (Advantages of Stick Welding: Why SMAW Still Wins).

Flux-cored arc welding (FCAW) works on a related idea. The wire is a hollow tube filled with flux, so it can shield itself (self-shielded FCAW) or accept supplementary gas from a bottle (gas-shielded FCAW). Once again the name tells you exactly what is happening: flux inside the core of the wire, an arc doing the work (Aluminum Flux Core Welding: What Actually Works in 2026).

Consumable vs. Non-Consumable: The Real Divide

The deepest split in arc welding is not shielding method. It is whether the electrode ends up in the weld.

– **Non-consumable:** Only GTAW works this way. The tungsten merely holds the arc; it does not melt into the puddle. Filler metal, when needed, is fed in separately by hand. That separation is what gives the welder independent control of heat and filler volume, and it is the mechanical reason behind the phrase “non-consumable electrode” you will see in every textbook definition of the process (AWS Welding Digest: What Is GTA Welding?).
– **Consumable:** GMAW, SMAW, and FCAW all feed electrode metal straight into the puddle. Deposition rates are higher and travel speeds faster, but heat input and filler composition are coupled together (Aluminum MIG Welding: The Complete Practical Guide).

U.S. Navy welding training literature states the trade-off plainly: GTAW gives the welder greater control than SMAW or GMAW, allowing stronger and higher-quality welds, but it is more complex to master and significantly slower than most other welding techniques (U.S. Navy Welding Training Manual). That single sentence explains most specification decisions on high-spec work.

Side-by-Side: The Four Processes Compared

Naming the Consumables: Tungsten Electrodes, Gases, and Filler Rods

Once you accept that TIG, GTAW, Heliarc, and WIG all describe the same process, you will notice the same naming logic runs through the whole shopping list. The torch, the gas bottle, the tungsten, and the filler rod each carry their own code, and those codes are not marketing labels. They tell you what the part is made of, what current it likes, and which metals it can join. Read them well and you order a rod that works instead of one that cracks on the first pass.

How Tungsten Electrodes Are Classified (AWS A5.12)

Tungsten electrodes follow the AWS A5.12M/A5.12 specification, aligned with ISO 6848, which covers tungsten and oxide-dispersed tungsten electrodes for arc welding and cutting. Every designation begins with EW, meaning electrode tungsten, followed by a suffix that names the oxide blended into the tungsten plus a number showing how much is there.

The backstory here is thorium. EWTh-2 was the traditional workhorse for GTAW of nickel- and cobalt-base alloys because it carries current well, starts reliably, and holds up under heat. Thorium, however, is a low-level radioactive material, so its grinding dust needs careful handling and dedicated containment. That is why ceriated and lanthanated electrodes have moved from niche alternatives to everyday choices in most shops: they deliver comparable arc starting and longevity without the radioactivity, and lanthanated in particular runs on both AC and DC, so you are not forced to keep two sets of tungsten on the bench.

Electrode naming matters because arc starting, current type, and material compatibility all hinge on it. A zirconiated tungsten balls up evenly on AC for aluminum and magnesium, while a thoriated or lanthanated tip gives the focused, stable cathode spot that DCEN work on steel and stainless demands. The same discipline applies across processes, and you will see it again in alloy steel electrode selection for stick welding, where the AWS classification printed on the flux coating tells you the same story in a different code.

Shielding Gases: Argon, Helium, and Mixes

The gas has its own naming vocabulary, and it starts with grade. TIG calls for high-purity, welding-grade gas rather than general industrial gas, because trace moisture and oxygen show up as porosity and cloudy, discolored beads. Argon is the default for most work: inert, inexpensive relative to helium, and calm enough to give a stable arc that beginners learn on easily. Helium conducts heat better and delivers a hotter, deeper-penetrating arc for thick sections, which is where the historical Heliarc name comes from. Deliberate mixes blend the two, pairing argon’s arc stability with helium’s penetration, and small hydrogen-bearing mixes sharpen the arc and improve wetting on austenitic stainless. Cylinder handling, regulators, and purge practice get thorough treatment in this guide to welding gas supply and cylinder safety.

Filler Rods: Decoding ER4043, ER5356, and ER70S-2

Filler rods follow the same AWS habit of spelling things out. The ER prefix means the product works as either an electrode or a rod. The numbers that follow identify the alloy family. ER70S-2 is a carbon steel rod under AWS A5.18: the 70 signals its tensile strength class, the S means it contains deoxidizers, and the 2 indicates the specific element package. Aluminum filler falls under AWS A5.10, the specification for bare aluminum and aluminum-alloy welding and brazing electrodes and rods, which is where the familiar names ER4043 and ER5356 come from. ER4043 is the general-purpose silicon-bearing rod that flows smoothly and resists cracking across a wide range of base alloys, while ER5356 is a magnesium-bearing rod with higher as-welded strength that holds its color better on anodized work. Matching rod to base metal is only half the job; the joint also has to be chemically clean, and proper aluminum cleaning before welding keeps a correctly specified filler from porosing up anyway. For a broader look at filler naming and how rod classifications differ by position and alloy, see this all-position welding rod guide.

When a drawing, a WPS, or a supplier invoice specifies these classifications by name, as described in AWS’s own overview of GTA welding, it removes ambiguity about chemistry, performance, and traceability. Terminology standards such as AWS A3.0, Standard Welding Terms and Definitions exist for exactly that reason: the name on the consumable is part of the weld record, and the weld record is what proves the joint was made with the right material.

Where TIG Welding Is Used: Industries That Specify GTAW by Name

Open a power-plant piping print, an aerospace weldment spec, or a semiconductor tubing drawing and you will rarely see the letters TIG. You will see GTAW, sometimes followed by a process number and a code reference. That is not snobbery. When the consequences of a bad weld are measured in millions of dollars or human safety, engineers write the official AWS terminology so there is zero room for interpretation across vendors, shops, and inspectors.

The American Welding Society puts it plainly: because of the high quality of welds GTAW can produce, the process has become indispensable in aerospace, nuclear, marine, petrochemical, and semiconductor manufacturing (AWS Welding Digest). Those five industries explain most of the GTAW language you will meet, and each has a reason rooted in inspection and metallurgy rather than habit.

What a GTAW spec line actually says

Spec lines are compressed on purpose. A note like “Root pass: GTAW, ER308L per AWS A5.9, full argon purge” hands the welder the process, the filler classification, and the shielding requirement in one breath. Attach a standard such as ASME B31.3 and it also fixes how the joint is prepared, qualified, examined, and rejected. Shop shorthand like “run a TIG root” never makes it into that record.

The process name carries equal weight in qualification paperwork. ASME Section IX procedure and performance qualification documents name the process in full, while ISO-format welder certificates identify GTAW by the number 141. When a welder’s card reads GTAW or 141, that is exactly what an inspector matches against the weld map, so slang only raises questions nobody wants mid-job.

The filler reference matters just as much, because it tells the receiving shop what to buy: AWS A5 filler metal specifications cover ER70S-2 for carbon steel roots, ER308L for stainless, and ER4043 or ER5356 for aluminum. The process name and the filler classification always travel together on a good drawing.

The industries that name GTAW

AWS’s list is a good map of where the term shows up. The pattern underneath is simple: the higher the pressure, the purity, or the inspection burden, the more likely the drawing names GTAW instead of leaving the welder to guess.

Semiconductor work is where GTAW gets most technical. High-purity gas lines are joined with automated orbital heads that walk the arc around a clamped tube, argon flowing inside and out, leaving a smooth, fully penetrated bore with nothing to trap contamination. The weld schedule fixes purge time, amperage profile, travel speed, and overlap, and a single sugared root is enough to condemn a gas system. That is why those drawings say orbital GTAW rather than simply “weld the tubing.”

Other specs push the same logic further. Thin-wall titanium and aluminum hydraulic lines in aerospace cannot afford a heavy heat-affected zone, so GTAW’s foot-pedal amperage control and separate filler hand get written into the procedure. Nuclear work adds qualified coupons and mandatory volumetric inspection before service, and marine or offshore systems rely on GTAW for stainless and alloy piping where an oxidised root would shorten service life. Medical device and implant fabrication follows the same discipline at a much smaller scale.

None of this stops you calling it TIG at the machine, and the power sources themselves are labeled that way. But the moment a job becomes a document, TIG vanishes: filler certifications, welder qualification records, weld maps, and inspection reports all say GTAW. Read the print, use the term it gives you, and the paperwork stays as clean as the bead.

Safety and Health: What the Name Doesn’t Tell You About TIG Welding

“Tungsten Inert Gas” sounds clean. The word inert even suggests something harmless. But the name only describes how the arc is shielded, not what the process does to the air in your shop or to the person holding the torch. Understanding what GTAW is called matters, and so does understanding what it does not promise.

The Hazards OSHA Actually Lists

The Occupational Safety and Health Administration groups welding, cutting, and brazing hazards into two categories. Health hazards include exposure to metal fumes and ultraviolet radiation. Safety hazards include burns, eye damage, electrical shock, and cuts from sharp edges and hot material. The work is regulated under 29 CFR 1910 Subpart Q for general industry and 29 CFR 1926 Subpart J for construction, and OSHA’s own welding safety fact sheet walks through the same list in plain language.

TIG welding is often considered a “cleaner” process than stick or flux-cored, and comparatively it is. There is no coating burning off the electrode and no flux breaking down in the arc. That does not make the fume harmless. Any arc above roughly 2,500 °F vaporizes a thin layer of base metal and filler, and that vapor condenses into particles fine enough to reach the deep lung. The UV output is intense as well, which is why a shade-appropriate helmet, gloves, and covered skin are non-negotiable regardless of which process name is on the print.

What NIOSH Says About Fume Limits

NIOSH’s welding fume PEL project set an 8-hour time-weighted average limit of 5 mg/m³ for total welding fume produced from iron, mild steel, or aluminum, documented in its published PEL threshold values. The same work estimated that 30 to 40 percent of all welders had experienced metal fume fever at some point, a flu-like episode of chills, nausea, and headache that follows heavy exposure, often to zinc or stainless fume. It is reversible, but recurring episodes are a signal that ventilation is failing, not that the welder is “getting used to it.”

The Thoriated Tungsten Problem

Here is a hazard unique to the process that bears TIG’s name. Many common tungsten electrodes are thoriated, meaning they contain 1 to 4 percent thorium oxide, a radioactive additive that improves arc starting and current capacity. Grinding a thoriated tungsten produces a fine dust, and the spent electrode becomes low-level radioactive waste. The American Welding Society’s Safety and Health Fact Sheet No. 27 recommends choosing thorium-free alternatives such as cerium-, lanthanum-, yttrium-, or zirconium-bearing types, and controlling grinding dust with dedicated local exhaust or a contained sharpener.

Electrode choice is a safety decision as much as an arc-performance one, and the same logic applies to filler and base metal selection. Any time you are matching consumables to a specification, resources such as our guide to alloy steel welding electrodes help keep selection and handling practices aligned.

Nano-Scale Fume: The Research Frontier

Recent work has complicated the picture further. A peer-reviewed study of apprentice welders measuring breathing-zone particles during TIG work found a mean geometric particle diameter of roughly 45 nanometers, with 92 percent of particle counts below 100 nanometers. Particles that small behave differently from the coarse dust older exposure limits were built around, which is why researchers continue to question whether a 5 mg/m³ mass limit captures the real risk. The practical takeaway is conservative: assume the fume is finer than it looks.

Controls That Actually Work

Exposure control follows a predictable hierarchy:

• Local exhaust ventilation positioned close to the arc, capturing fume before it reaches the breathing zone.
• Fume-extraction torches and guns that draw contaminant through the handle itself, useful in out-of-position and field work.
• Electrode substitution swapping thoriated tungsten for ceriated or lanthanated equivalents, plus thorium-free grinding discipline.
• Respiratory protection when engineering controls cannot hold exposure below limits, selected through a written program rather than bought off the shelf.
• Wind and draft control since shielding gas blowaway both ruins the weld and changes what ends up in the room.

Good habits are teachable, and formal training tends to install them earlier, which is one reason structured programs like an aluminium welding course cover fume handling alongside technique. The name TIG tells you how the arc is shielded. Everything above tells you how to survive working under it.

Common Misconceptions, Mistakes, and Practical Takeaways

You now know the full naming story: TIG, GTAW, Heliarc, and WIG all describe one process. Before we wrap up, it is worth clearing out the myths that survive in shops and classrooms, because those myths cause real mistakes at the bench and real errors on paperwork.

Myth 1: “TIG” Is a Brand or a Separate Process

TIG is not a brand name, and it is not a second process sitting next to GTAW on the machine. “TIG welding” and “GTAW” are two labels for the identical operation: an arc struck between a non-consumable tungsten electrode and the workpiece, shielded by inert gas. The American Welding Society defines the process once, under one name, and you can read that definition in the AWS Welding Digest explainer on GTA welding. If a shop traveler says “GTAW” and a welder says “TIG,” the same weld procedure, the same welder performance qualification, and the same inspection criteria apply. Treating them as separate leads people to assume a “TIG procedure” can substitute for a qualified GTAW procedure without review. It cannot, because there was never a distinction to begin with.

Myth 2: TIG Is the Same as Plasma Arc Welding

Plasma arc welding (PAW) shares GTAW’s family DNA, and many plasma machines literally start life as TIG power sources. But PAW constricts the arc through a small nozzle orifice, producing a hotter, more focused plasma jet that cuts deeper and travels faster. That constricted arc is the whole difference, and it changes travel speed, joint design, and heat input. Writing “PAW” and “GTAW” interchangeably on a drawing is a specification error, not a rounding error. When a print calls for GTAW specifically, it usually wants the broader, gentler arc and the manual control that comes with it, the kind of work you see in aerospace TIG welding applications.

Beginner Mistakes That Come From Misunderstanding the Name

Several classic beginner errors trace directly back to not really believing what “non-consumable tungsten electrode” means.

• Contaminating the tungsten. Because the electrode is not meant to be consumed, touching it to the puddle transfers weld metal onto it and destabilizes the arc. The fix is always the same: stop, let it cool, regrind to a clean geometry, and start again. Grind lengthwise so the scratches run with the arc, not around it.
• Wrong polarity and current type. Steel and stainless typically run DC electrode negative, while aluminum and magnesium need AC to crack their oxide layer. Welders who learned one setting and carry it everywhere struggle with etching, poor cleaning action, or overheated tungsten.
• Inadequate gas coverage. Argon flow that is too low leaves the puddle unprotected; flow that is too high creates turbulence that pulls air in. Oversized cups, long stick-out, and drafty bays all defeat the shielding envelope.
• Ignoring wind drafts. The shielding gas stream is a gentle laminar blanket, and a shop fan or an outdoor breeze can blow it straight off the arc. This single limitation pushes many field welders toward stick or flux-cored processes outside.
• Expecting high deposition. GTAW is relatively slow with low filler deposition, so it is inefficient on thick sections. For heavy plate, GMAW or FCAW earn their place; comparing the trade-offs is exactly what our aluminum MIG welding guide walks through.

A Terminology Checklist for the Shop and the Office

Use this list the next time you review a print, write a WPS, or fill out a welder qualification record:

1. Write the AWS process name (GTAW) on drawings and procedures; use “TIG” only as a friendly shop synonym.
2. Check ISO 4063 numbering if the document is international, since European drawings often carry the process code instead of a name.
3. Confirm filler and electrode specifications use AWS classification designations, not casual nicknames.
4. Verify current type and polarity are spelled out, since AC versus DCEN changes both the result and the electrode selection.
5. Note shielding gas and flow requirements explicitly, including wind limits for outdoor work.
6. Match the process name to the application honestly: TIG for precision and root passes, GMAW, FCAW, or SMAW where deposition and speed matter more, as our stick welding advantages guide explains.
7. Keep safety documentation aligned with the actual process, since shielding gas asphyxiation, UV exposure, and electrode-specific hazards differ by process; OSHA’s welding, cutting, and brazing hazard guidance is the right starting reference.

Conclusion: The Short Answer, Restated

So, what is the name of TIG welding? The shop name is TIG, short for tungsten inert gas. The official AWS name is GTAW, gas tungsten arc welding, and that is what belongs on drawings, procedures, and certification paperwork. Historically and regionally you will also hear Heliarc, a legacy of Linde’s helium-era commercialization, and WIG, the German-language equivalent. One process, one tungsten electrode, one inert gas shield, four names. Learn to translate between them and you will never be caught off guard in the middle of that conversation again.

Frequently Asked Questions

What is the real name of TIG welding?

The official American Welding Society name is gas tungsten arc welding, abbreviated GTAW. “TIG” is the common short form of tungsten inert gas welding, the name most U.S. welders use on the shop floor. Both names describe exactly the same process.

What does TIG stand for?

TIG stands for Tungsten Inert Gas: tungsten for the non-consumable electrode, inert for the unreactive shielding gas (argon or helium), and gas for the way that shielding is delivered around the arc through the torch.

Why do some people call TIG welding Heliarc?

Heliarc was the original name given to the process by Russell Meredith at Northrop Aircraft in the early 1940s, because it used an electric arc with helium as the shielding gas. Linde Division of Union Carbide bought the patents and sold torches under the Heliarc name, so the nickname stuck for decades.

Is WIG welding the same as TIG welding?

Yes. WIG is the German acronym for Wolfram-Inertgas-Schweißen, which translates to tungsten inert gas welding. European drawings and procedures, especially from German-speaking countries, commonly specify WIG for the same process Americans call TIG or GTAW.

What is the difference between TIG and GTAW?

There is no technical difference; it is purely a naming difference. GTAW is the formal AWS designation used in codes and procedure documents, while TIG is the informal shorthand used by welders. A WPS that says GTAW and a welder who says TIG are talking about the same process.

Is TIG welding the same as plasma arc welding?

No, they are distinct processes with related DNA. In GTAW the arc is established between a non-consumable tungsten electrode and the workpiece, while plasma arc welding constricts the arc through a nozzle to create a higher-energy plasma jet. AWS classifies them separately.

What does GTAW stand for and how is it different from GMAW?

GTAW is gas tungsten arc welding, using a non-consumable tungsten electrode and inert gas shielding. GMAW is gas metal arc welding, commonly called MIG, which uses a continuously fed consumable metal wire electrode. The electrode type is the key difference between the two names.

Why do some welders say TIG welding is hard to learn?

TIG requires coordinating both hands (torch and filler rod) plus often a foot pedal for amperage, with tight tolerances on arc length, travel speed, and gas coverage. It is also slower than MIG or stick welding, and the tungsten electrode is easily contaminated, so mistakes interrupt the work.