TIG welding
What thickness can you weld with tig welding?
Quick answer
TIG welds from 0.5 mm foil up to 6 mm comfortably with the right tungsten and current; thicker sections need multi-pass or bevelled prep like any process.
Numbers by machine/output class
| Thickness (steel) | Current (DCEN) | Tungsten | Filler rod |
|---|---|---|---|
| 1 mm | 30–60 A | 1.6 mm | 1.6 mm |
| 1.5–2 mm | 50–90 A | 1.6–2.4 mm | 1.6–2.4 mm |
| 3 mm | 90–130 A | 2.4 mm | 2.4 mm |
| 6 mm | 150–200 A | 2.4–3.2 mm | 3.2 mm |
Beyond single-pass
Thickness limits assume full-penetation single-pass welds. Bevelling the joint, multi-pass stacking and preheat on thick sections extend any process dramatically — that's how structural welders join 50 mm plate with the same physics. Match the machine class to the thickness you actually weld 90% of the time.