... contain 8 single welding methods: MMA, DC-argon arc welding, pulsed-argon arc welding, argon arc spot welding, GMAW(CO2/MIG/MAG), pulsed ... -GMAW, double-pulsed GMAW, arc carbon gas cutting welder and contain welding method consisted of ... improved IGBT inverting technology which has diminished the entire power source volume and weight, greatly reduced the loss of copper and ...