... for the fields of furniture, vehicle, electric power, construction, conduit.... WS series IGBT invert DC TIG welderItem\ModelWS-315WS-400WS-500WS ... , DC TIG, and etc., suitable to weld on carbon steel & SS and others metal.b). Pre-set welding current before operation ... of furniture, vehicle, electric power, construction, conduit & pipeline and etc. WS series IGBT invert DC TIG welder