High-performing technique that allows joining together thinner workpieces. It is fully manual. The distinctive feature of this welding technique is that it can be used in confined spaces. It can be performed either with or without welding filling material. However, the workpieces must be paired very accurately; thus, the technique is used to join together components previously realised with machine tools, such as milling machines or lathes. The weld pool requires thoroughly cleaned and controlled joints and environments.

The TIG welding process is particularly recommended for joining together workpieces of small thickness, starting from a few millimetres, and generally is not used to weld workpieces thicker than 5-6 mm.