Cutting discs shopping in the UK in 2023? TIG stands for Tungsten Inert Gas; this is because a tungsten electrode combined with an inert gas (argon) is used for this welding method. TIG welders are used in industry for precise welding. A tungsten electrode is used to strike an arc that allows welding of all materials. You can use a TIG welding machine to weld mild steel, stainless steel & aluminium. Aluminium TIG welding requires an AC welding output that can only be found on an AC DC TIG welder. This type of welder is usually more expensive than a …