... CO2 gas shielded welding machine / IGBT inverter CO2 gas shielded welding machine and manual NB-270 ,NB-350, NB-500, NB-630CO2 gas shielded welding machine / IGBT inverter CO2 gas shielded welding machine and manual combination welding machine ... no arc crater after welding.3. Economic, light, portable: high rated duty cycle, long time consecutive welding is available. High working efficiency, save ...