AC DC TIG WELDING MACHINEtungsten inert gas(TIG)welding, is anarc weldingprocess that uses a non-consumabletungstenelectrodeto produce theweld. The weld area and electrode is protected from oxidation or other atmospheric contamination by aninertshielding gas(argonorhelium), and afiller metalis normally used, though some welds, known as autogenous welds, do not require it. When helium is used, this is known asheliarc welding
While the aerospace industry is one of the primary users of gas tungsten arc welding, the process is used in a number of other areas. Many industries use GTAW for welding thin workpieces, especially nonferrous metals. It is used extensively in the manufacture of space vehicles, and is also frequently employed to weld small-diameter, thin-wall tubing such as that used in the bicycle industry.