... to arc,small flash,low noise stable welding arc,wonderful welding shape,energy-saving,lightness,minimizing 1.It adopt MOSFET/IGBT inverter technology,high ... balance automatic when voltage is waving,with high resist to electrical wave3.It has high effciency,small unload loss,save 40% energy ... %Power Fact:0.93Efficiency:85%Insulation Class:BProtection Class:IP21 DC INVERTER WELDING MACHINE