TIG Tungsten Inert Gas abbreviation TIG.
GTAW welding operation includes manual, semi-automatic and automatic welding
When GTAW welding gun movement and add filler wire entirely by hand operation
When semi-tungsten arc welding, torch movement by manual operation, but the filler wire is automatically fed by the wire feeder
When automatic TIG welding, the welding torch mounted on a small car. Car travel and filler wire can be added with cold wire or hot wire way