... Cycle is 90% . Adopt MOSFET invert technology, advanced electronic circ WS-Z series DC inverter TIG/MMA welder(WS200Z) Function and ... invert technology, suited for all of TIG and MMA welding.5.Easy arc starting, steady welding current, fast dynamic response, ... classFFFFProtection classIp23Ip23Ip23Ip23Suitable welding thickness0.3-0.80.3-0.80.5-100.5-10 WS-Z series DC inverter TIG/MMA welder(WS200Z)