... , soft switch, high working efficiency; MOSFET AC/DC TIG Welding Machine(WSE-350) 1. MOSFET inverter technology and precision constant current feedback ... , convenient for carry, stable current, steady and intensive arc, energy saving, low noise;3. High capacity of oxide ... , over-current protection, under-voltage protection;5. DC welder suitable for stainless steel, alloy steel, carbon steel, copper ...