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Gas tungsten arc welding

Gas tungsten arc welding (GTAW) is commonly known as tungsten inert gas welding (TIG), however since some process variations utilize active (other than inert) shielding gases, the correct technical term is GTAW.

In this process a non-consumable tungsten electrode is used and the electric arc occurs between this electrode and the work. Filler metal usage is optional; a weld when no external filler metal is used it is known as an autogenous weld. The molten weld and the arc zone are protected from atmospheric contamination by a shielding gas (usually, but not always, an inert gas such as argon). A constant current welding power supply produces energy which is conducted across the arc through a column of highly ionized gas and metal vapours known as a plasma.

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Welding Encyclopedia

1 History of Welding

2 Arc Welding processes

2.2 Gas welding

2.3 Resistance welding

3 Welding costs

4 Safety issues