... ,self-protection 3.AC/DC, TIG/MMA, Pulse IGBT DC TIG welder/Welding Machine(CE approval, TIG200ADC)1. Reactive power ... , soft switch(IGBT) technology, square wave power supply;2. Compact structure, stable welding current, steady and intensive arc, foot pedal ... ~ 0.9Pulse Frequency0.5 ~ 25HzPost-flow Time1 ~ 25sec.Pilot Arc ModeHigh FrequencyEfficiency≥80%Max. Welding Thickness0.2in. (6mm)0.3in ...