Of all the arc welding processes, TIG (tungsten inert gas) welding (also known as gas tungsten arc welding or GTAW) is capable of achieving the highest quality welds and is the most versatile in terms of what can be welded and the position of the welds. As in most industrial processes, however, quality comes at the expense of time. TIG is generally slower than MIG or MMA (manual metal arc) welding but, where weld integrity is critical, production engineers are prepared to accept the additional process time. In addition, TIG machines can be used for brazing and MMA welding, which helps to improve on an investment in TIG equipment.
Typical applications for TIG welding include sheet metal, pipe line welding and architectural stainless steel fabrications such as ballustrades. TIG welding is suitable for both manual and mechanised welding as well as for using welding robots.