In TIG welding an arc is formed between a nonconsumable tungsten electrode and the metal being welded. Argon is generally added to increase heat input (increase welding speed or weld penetration). Hydrogen/Helium will result in cleaner looking welds and also increase heat input.
TIG Welding Benefits:-
- Superior quality welds
- Welds can be made with or without filler metal
- Precise control of welding variables (heat)
- Free of spatter
- Low distortion