The Complete TIG Welding Equipment Checklist

TIG welding, also known as GTAW (Gas Tungsten Arc Welding), rewards precision, cleanliness, and control. Having the right gear—and organizing it into a reliable system—makes the difference between a smooth, consistent bead and a frustrating session. This complete TIG welding equipment checklist covers the welder, torching setup, gas delivery, consumables, safety gear, prep tools, and a practical pre-weld routine. Use it to outfit a new bench or audit your existing setup for gaps before your next critical project.

Core TIG Welder and Power Source Requirements

Your power source is the heart of TIG. For most fabrication shops and serious hobbyists, an AC/DC inverter TIG welder with high-frequency (HF) start, pulse control, and a wide amperage range (e.g., 5–200 A on 120/240 V, or up to 250–350 A on 240 V) covers thin sheet through heavier sections. AC is essential for aluminum and magnesium; DC is used for steels, stainless, copper alloys, and most hard-facing. Look for a stable arc at low amps, repeatable arc starts, and useful AC controls (balance and frequency) if you weld aluminum. Duty cycle and input power (120 V vs 240 V, single-phase) should match your workload and shop circuits.

AC vs. DC and control features

On AC for aluminum, adjustable balance lets you tune cleaning action (EP) versus penetration (EN); many welders start around 65–75% EN for general work. AC frequency control (e.g., 80–120 Hz for general, higher for narrow beads) adjusts arc focus. On DC, a smooth, consistent current and reliable HF start minimize contamination from scratch starts. Built-in pulse (e.g., 0.5–2 Hz for heat control on thin stainless, faster pulses for cosmetic ripples) helps control distortion and improve puddle timing. If your projects vary, memory presets and a clear front panel save time between procedures.

Power and duty cycle considerations

Plan your machine size for the thickest jobs you intend to tackle regularly. A 200 A class inverter is versatile for thin to medium work; moving to 250–350 A makes sense for heavier aluminum or extended duty cycles. Verify duty cycle ratings (e.g., 200 A at 40% or better) and ensure your shop wiring—breaker size, receptacle, and extension cord gauge—is appropriate. Where portability matters, consider dual-voltage models and compact inverter footprints. For maximum arc stability and start reliability, HF start is preferred over lift-arc on critical work.

• Minimum capabilities: AC/DC, HF start, foot pedal compatibility, postflow control
• Advanced options: Pulse TIG, AC balance/frequency, programmable memories
• Match input power and duty cycle to your heaviest typical job

Torches, Leads, and Remote Controls

Your torch choice affects comfort, access, and heat management. Air-cooled torches (e.g., WP-9, WP-17, WP-26) are simple and portable; they’re ideal up to about 200 A with moderate duty. Water-cooled torches (e.g., WP-20) stay compact and cool at higher amperage (200–300 A and above) but require a cooler, hoses, and maintenance. Flex-head and swivel torches improve ergonomics, while braided super-flex leads reduce wrist strain and help with long beads. Ensure your torch connections match your welder (Dinse size, gas-through capability) and that strain reliefs and quick-connects are in good condition.

Air-cooled vs. water-cooled

Choose air-cooled for portability, lower cost, and simpler plumbing when most work is under ~200 A. For extended aluminum runs or thicker sections where heat builds quickly, a water-cooled WP-20-class torch is smaller in hand and keeps consumables alive longer. If you go water-cooled, pair torch, cooler, and hoses as a system and keep coolant clean and topped off to prevent pump wear. Quick-disconnects, a tidy hose management strategy, and a cooler interlock (if available) prevent accidental dry-running.

Foot pedal vs. torch-mounted control

A foot pedal provides the most intuitive amperage modulation for bench work and long beads. On ladders or in cramped positions, a torch switch or finger wheel offers on-the-fly control without relocating your stance. Many welders keep both: pedal for the bench and a torch switch for field or awkward joints. Whichever you use, keep cables protected with leather covers, route them to avoid tight bends, and verify the strain relief near the torch and pedal is intact.

• Common torches: WP-9 (small, light-duty), WP-17 (150 A air-cooled), WP-26 (200 A air-cooled), WP-20 (250 A water-cooled)
• Helpful add-ons: flex head, gas lens kits, clear cups, super-flex leads, leather cable cover
• Connections: correct Dinse size, gas-thru adapter, tight o-rings, quality quick-connects

Shielding Gas, Regulators, and Purge Gear

Pure argon (99.99%) is the standard shielding gas for TIG on steel, stainless, and aluminum. Typical flow settings range from roughly 10–20 CFH (5–10 L/min), adjusted for cup size, gas lens use, and drafts; larger cups or long stickout may require more flow. Helium or argon/helium blends can boost heat input and travel speed on thick nonferrous joints but are less common for general work. Use a quality regulator-flowmeter or a calibrated flow gauge, and keep hoses tight, o-rings healthy, and joints leak-free. Postflow protects hot tungsten and the puddle; a starting point is about 1 second per 10 amps, then adjust for tungsten size and cup volume.

Purge and trailing shields

On stainless steel, titanium, and other reactive alloys, back purging prevents sugaring and oxidation on the root. Use purge dams, tape, or inflatable bladders to contain purge gas, and target interior flows around 5–15 CFH depending on volume. Keep vent holes small and check oxygen levels before welding on ultra-critical materials. Trailing shields or larger cups with gas lenses extend coverage on long beads or slow-cooling alloys. Always confirm that purge gas is flowing and that the joint interior is clean and dry before striking an arc.

• Gas essentials: argon cylinder (securely chained), regulator-flowmeter or flow gauge, check valves
• Hoses and seals: tight fittings, good o-rings, leak-check with soapy water
• Purge kit: tape/dams, purge line and needle valve, trailing shield as needed

Tungsten Electrodes and Torch Consumables

Tungsten selection depends on material, amperage, and current type. For DC on steel and stainless, 2% lanthanated (blue) or 2% ceriated (gray) are popular for stable arcs and easy starts; 2% thoriated (red) performs well but contains thorium, so handle grinding dust with care. On AC for aluminum, 2% lanthanated or zirconiated (brown) hold shape and resist balling; modern inverters favor a pointed or slightly blunted taper rather than a large ball. Common diameters include 1/16 in (1.6 mm), 3/32 in (2.4 mm), and 1/8 in (3.2 mm). Match collets, collet bodies or gas lenses, and cups to your tungsten diameter and job geometry.

Grinding and tip prep

Prepare tungsten by grinding lengthwise (parallel to the electrode) to avoid circumferential scratches that destabilize the arc. A taper of about 2–3 times the electrode diameter with a small flat at the tip works for most DC joints. Dedicate a grinding wheel or, better, a diamond grinder to tungsten only to prevent contamination; collect dust safely. For AC aluminum, many inverter users run a pointed or slightly rounded tip to maintain a narrower arc, adjusting AC balance for cleaning instead of relying on a large balled tip. If the tip becomes contaminated, stop and regrind before continuing.

• DC steels/stainless: 2% lanthanated or ceriated, pointed/blunt tip
• AC aluminum: 2% lanthanated or zirconiated, pointed or slight dome
• Sizes to stock: 1/16 in for thin work, 3/32 in general purpose, 1/8 in for higher amps
• Consumables: collets, collet bodies or gas lenses, cups (#4–#12), back caps, o-rings

Gas lenses improve laminar flow and allow longer stickout with better shielding, especially on stainless and titanium. Ceramic (alumina) cups are durable and cost-effective; clear (quartz) cups improve visibility but can be more fragile and flow-sensitive. Keep a range of cups for tight access (#4–#6), general use (#7–#8), and wide coverage (#10–#12). Inspect collets for wear and cracking; a slipping tungsten often traces back to a tired collet or damaged back cap threads.

Filler Metals for Steel, Stainless, Aluminum, and More

Select filler rod to match the base metal and service conditions. For mild and low-alloy steel, ER70S-2 is a versatile choice with good deoxidizers for less-than-perfect prep; ER70S-6 is also common. Stainless jobs typically use ER308L for 304, ER309L for joining stainless to carbon steel, and ER316L for moly-bearing grades. Aluminum work often calls for ER4043 (good fluidity and crack resistance) or ER5356 (higher strength, better color match on anodized parts). Silicon bronze (ERCuSi-A) is useful for TIG brazing or joining dissimilar metals at lower heat input.

• Mild steel: ER70S-2 in 0.035 in, 1/16 in, 3/32 in
• Stainless: ER308L/309L/316L in 0.035 in, 1/16 in, 3/32 in (cleanliness is critical)
• Aluminum: ER4043 or ER5356 in 3/64 in, 1/16 in, 3/32 in (keep sealed and dry)
• Specialty: ERCuSi-A (silicon bronze), nickel alloys for specific applications

Keep filler rods clean and organized in labeled tubes to prevent cross-contamination. Wipe rods with acetone before critical stainless or aluminum work. Match rod diameter to puddle size—too heavy a rod will chill the puddle and cause inconsistencies, while too fine a rod can ball up before it reaches the molten pool. Practice consistent rod angle and dab timing to minimize tungsten contamination and maintain bead rhythm.

Safety Gear and Shop Setup for GTAW

Even though TIG is a clean process, it still produces UV radiation, ozone, and hot metal. Use an auto-darkening helmet with a shade range that covers 10–13 for most TIG, and ensure it is HF start compatible and sensitive enough for low-amp work. TIG gloves should offer dexterity and heat resistance; add a heat shield or thicker glove on the filler hand for long aluminum runs. Wear flame-resistant clothing (leather or FR cotton), high-top boots, and safety glasses under the hood. Keep your workspace uncluttered with a stable, grounded welding table and good task lighting.

Fume control and ventilation

Provide local exhaust ventilation or fume extraction, especially when welding stainless steels that can generate hexavalent chromium. A P100 respirator with appropriate filters may be needed where fume capture is insufficient; always verify compatibility with your application. Argon displaces oxygen—avoid purging into confined spaces without monitoring and ventilation. Secure gas cylinders upright with chains, cap them when not in use, and keep combustibles away from the work zone. Maintain a fire watch after welding on thick or heat-sinking assemblies.

• Helmet: auto-darkening, TIG-sensitive, quality lenses
• Hand protection: TIG gloves, heat shields, TIG finger for sliding rests
• Body protection: FR jacket/apron, natural fiber pants, boots
• Fume and gas: local extraction, respirator as needed, safe purge practices
• Shop: grounded table, good lighting, tidy cable routing, first aid and fire extinguisher

Workholding, Prep Tools, and Accessories

Clean metal and tight fit-up are non-negotiable in TIG. Degrease with acetone or a suitable solvent and use dedicated stainless steel brushes—one for aluminum, one for stainless—to avoid cross-contamination. For aluminum, remove oxide mechanically before welding and again if the joint sits for long. Prepare edges with flap wheels, carbide burrs, or a sander, and deburr to help wetting. Use copper or aluminum chill bars as heat sinks on thin material or to support edges during tacking.

• Surface prep: acetone, lint-free wipes, dedicated SS brushes, Scotch-Brite, flap wheels
• Cutting/fit-up: angle grinder, die grinder, saws, deburring tools, layout dye, scribe
• Workholding: C-clamps, self-adjusting clamps, magnets (keep away from arc as needed), V-blocks, squares, fixturing table
• Electrical: robust ground clamp, clean ground point near weld zone, cable covers and strain relief
• Tungsten prep: dedicated grinder or diamond wheel, collet organizer, spare o-rings/back caps

Good grounding reduces arc wander and porosity; attach the work lead close to the joint on clean metal. Keep a small collection of copper backing bars for thin stainless and sheet aluminum to reduce burn-through. Organize consumables—collets, cups, and tungstens—by size so changeovers are fast and error-free. Finally, stage your filler rods, pedal, and torch so your body posture is comfortable before you strike an arc.

Pre-Weld Setup and Maintenance Checklist

Turn a pile of gear into a repeatable process with a short routine. Start with safety and workspace checks, then verify gas, electricity, and consumables. Confirm machine settings and do a quick test on a coupon to dial in arc starts, amperage, and gas flow. Consistency here pays off with cleaner welds and less rework.

1. Secure the argon cylinder, confirm regulator is off, and inspect hoses and o-rings.
2. Verify torch assembly: correct tungsten type/size, clean tip, proper stickout, cup size, and gas lens if used.
3. Select filler rod and clean it; lay out a few rods within easy reach.
4. Prep the joint: degrease, brush, fit, and clamp; add copper backing or purge dams if needed.
5. Attach the work lead to clean metal near the weld; verify a solid, low-resistance connection.
6. Set the machine: process (AC/DC), amperage ceiling, pulse if desired, AC balance/frequency for aluminum.
7. Set gas flow: typically 10–20 CFH; more with larger cups/long stickout—verify with a flowmeter.
8. Dial postflow: about 1 second per 10 amps as a starting point; increase for larger tungstens.
9. Confirm remote: foot pedal or torch switch works smoothly; check HF start on a test coupon.
10. Execute a tack plan: place tacks to control distortion, verify fit after tacking, then proceed.

Routine maintenance

Weekly or after heavy use, check coolant levels on water-cooled systems and top off with the recommended mix. Inspect torches for cracked cups, damaged threads, loose back caps, and worn collets; replace before they cause contamination or slipping tungstens. Leak-test gas fittings with a mild soapy solution; bubbles flag issues early. Clean or replace torch o-rings and keep quick-connects free of grit. Keep a log of machine settings and issues—patterns emerge that speed troubleshooting.

Quick troubleshooting cues

• Grainy or sooty bead: increase gas flow, switch to a gas lens, shield from drafts, re-clean material.
• Tungsten contamination: stop, break the arc, regrind tip, and inspect collet tension and stickout.
• Arc wandering: improve ground contact, shorten stickout, center the tip, and verify tungsten geometry.
• Overheated torch: lower amperage/duty, increase postflow, or move to a water-cooled torch.
• Poor AC cleaning on aluminum: increase EP (less EN), verify oxide removal, adjust AC frequency.

With the right TIG welder, a comfortable torch and remote, reliable gas delivery, properly prepared tungsten, and clean filler rods, your technique can shine. Combine that with disciplined prep, good fixturing, and a short pre-flight checklist, and you’ll see immediate gains in arc stability, bead appearance, and joint quality. Use this equipment checklist as your baseline, expand it to match your materials and projects, and revisit it regularly to keep your GTAW setup dialed.