... NB-270 ,NB-350, NB-500, NB-630 CO2 gas shielded welding machine / IGBT inverter CO2 gas shielded welding machine and manual NB-270 ,NB-350, NB-500, NB ... Economic, light, portable: high rated duty cycle, long time consecutive welding is available. High working efficiency, save power ... package dimension(mm)670*400*610mm NB-270 ,NB-350, NB-500, NB-630 IGBT inverter CO2 gas shielded welding machine