... Class:HEfficiency(%): 83-85Feather:1. Mixed functions of SMAW, DC TIG, and etc., suitable to weld on carbon steel & SS and others ... filling, gas pre-flow, gas post-flow function.5. Advanced IGBT-20KHzTM dual inverter technology and digital controllable, and its ... .7. Applicable to the fields of furniture, vehicle, electric power, construction, conduit & pipeline and etc. IBGT invert DC TIG welder with ...