... in ChinaObtain patent, patent number:ZL 2008 2 0076183.5(Double-pulsed GMAW)ZL 2008 1 0054660.2(Multiple functions digital ... , argon arc spot welding, GMAW(CO2/MIG/MAG), pulsed-GMAW, double-pulsed GMAW, arc carbon gas cutting welder and contain welding ... , which is much easy and useful for client’s usage. Double Pulsed GMAW