Welding with a tungsten electrode was introduced in 40-ies and it was designed for aluminum and magnesium alloys.
Beside non-ferrous metals, this process is widely used for both stainless steels, low alloyed and carbon steels. TIG process is mainly used in welding of thin parts (usually up to 6mm.). During this process metal is heated and melted in the welding area by electric arc. Shielding gas, which is fed from the nozzle, protects the pool and the electrode. The electrode itself is made from heat-resisting material and installed in the center of the nozzle and it is not consumed. Additive is usually fed to the welding area manually but it may also be fed automatically.
Argon, helium or their mixtures are usually used for shielding. VARIGON welding mixtures with oxygen or nitrogen may be very useful in certain conditions.
TIG process is typically used for welding of aluminum, magnesium or titan alloys, steel pipes, pressure vessels, heat exchangers, items for food products etc. This process is suitable for small parts and thus it is used in electronic industry
The benefits of TIG process are high quality of weld, lack of splashes and slug. This is a highly flexible process. It may be applied to different materials in any orientation and it is suitable for majority of joints.The main drawback of this process is its low speed.