... series AC/DC square-wave TIG welding machine Functions: AC/DC TIG welding, AC/DC pulse TIG welding, AC/DC manual welding, AC/DC spot welding ... steel, copper, titanium and carbon steel.3. In AC, the machine has descending external characteristic with square wave welding current, it ... 6. Various functions: AC/DC TIG welding, AC/DC pulse TIG welding, AC/DC manual welding and AC/DC spot welding.7. Current ...