TIG welding is a welding procedure in which an arc is drawn between a non-consumable electrode and the workpiece. The molten bath and the electrode are protected by an inert (neutral) gas or gas mixture. The TIG name is an abbreviation of the English Tungsten Inert Gas (tungsten = tungsten). Sometimes also called the old American name Argonarc used. If inert gases are substantially argon and in some cases, helium or a mixture of both gases. AC is to date the most common type of current for welding aluminum because this occurs a combination of reasonable penetration and reasonable removal of the oxide scale.