Gas tungsten arc welding commonly known as Tig welding ( tungsten inert gas) is a process to produce high quality welds in virtually all weldable metals. Metals included for tig welding are aluminium, brass & bronze, copper, cast iron, nickel, lead, precious metals such as gold & silver, steel, stainless steel and titanium. It can be done manually or automatically.
Tig Welding is done using a tungsten electrode, however the tungsten electrode is not consumed but is used to create the arc where by a filler rod is used to create the weld. There are circumstances where tig welding is done without a filler material such as corner joints on thin metals. Inert gasses are used to sheild the electrode from atmospheric contamination.
Tig welding requires the use of a constant current power source, an inert gas such as argon, gas regulating equipment, a tig welding torch and when needed a filler metal of the same material being welded.
Tig welders manipulate the welding torch to control the length and size of the welding pool, carfully adding filler metal to the weld pool. The result is a very pure and high quallity weld. Tig welding requires more welder skill than other manual welding processes. Examples of the uses of tig welding are, food industry equipment, aluminium work such as bicycle frames and stainless steel balustrades.
Although many metals are TIG welded, the metal most frequently associated with the process is aluminum, especially with metals of a smaller thickness. Many other processes, of course, can join aluminum, but in the lighter gauges the most applicable process is TIG. The popularity of aluminum in automotive applications has brought TIG welding to a new golden age. Mechanically strong and visually appealing, TIG welding is the number one process chosen by professional welders for professional racing teams, and the avid auto enthusiast or hobbyist.
Tig welding can be learned through welding schools or from online manuals such as in the resources list.