... stable arc, with digital current show, protection design. IGBT Inverter DC ARC Welding Machine:MMA welderModel No:ZX7-400sTechnical parametersZX7-400S ... & development capacity, our product range covers inverter MMA, TIG, MIG/MAG, PULSE TIG, AC/DC TIG, PLASMA CUTTING series. And most of welding ... . Quality is reliable and service is good. IGBT Inverter DC ARC Welding Machine:MMA welder(ZX7-400S)