AC TIG is generally used to weld aluminum and magnesium materials. For the best appearance, highest quality and leak free welds on aluminum AC TIG welding is the process of choice.
DC TIG is generally used to weld exotic material like stainless steel, nickel alloys, copper, titanium and critical welds that must be flawless such as aircraft engine parts.
The primary gas used for TIG welding is argon and in some applications as with thick aluminum when additional penetration is needed an argon/helium mixture or pure helium is used. TIG welding offers the user the greatest amount of flexibility to weld the widest range of materials and thicknesses. TIG is the cleanest welding application with a minimal amount of sparks, spatter and smoke.
