... voltage separately. Changed one knob that can welder to choose CO2/MAG, and cooperate with other kinds of air automatic welding machine ... stick(MMA) welding, carbon arc welding and CO2 gas shielded welding.Normal Accessories: Earth clamp 1pcs, CO2 regulator 1pcs, electrode feeder 1pcs, Earth cable ... cored wire)1.2/1.6120-450NB630 MIG Series Inverter CO2 Gas Shielded Welding Machine(IGBT Module)