Gas Tungsten-Arc Welding (GTAW), also known as Tungsten Inert Gas or TIG
welding, uses tungsten electrodes as one pole of the arc to generate the heat
required. The gas is usually argon, helium, or a mixture of the two. A filler wire
provides the molten material if necessary.
The GTAW process is especially suited to thin materials producing welds of excellent quality and surface finish. Filler wire is usually selected to be similar in composition to the materials being welded.
Atomic Hydrogen Welding (AHW) is similar and uses an arc between two tungsten or carbon electrodes in a shielding atmosphere of hydrogen. Therefore, the work piece is not part of the electrical circuit.
