IGBT, INVERTER, PORTABLE,MMA Our company produce DC IGBT INVERTER MANUAL ARC WELDING MACHINE for many years. 1. Uses the most ... The dynamic response is quick, the welding splashes slightly, the electric arc is steady, the welding performance is outstanding, the welded joint ... voltage, 50/60HZ power source.7. ZX7-400.500 welding machines are according to the GB code standard design manufacture, it ...