Tungsten inert gas welding (TIG process, EN ISO 4063: Process 141) comes originally from the US and was developed there in 1936 as Argonarc welding. It was not until the early 1950s, that the process was also introduced in Europe. In English-speaking countries, the process is referred to as TIG - tungsten inert gas. The principle is based on arc-welding with a tungsten electrode and argon as shielding gas. This inert shielding gas atmosphere prevents oxidation at the welding spot so that no flux is necessary.