IGBT inverter technology,current-mode control,reliable quality,stable performance. Closed loop feedback control,constant voltag NB(MIG) IGBT CO2 shielded welding machine series NB-280/NB-350/NB-600TraitIGBT inverter technology,current-mode control,reliable quality,stable performance.Closed loop feedback control,constant voltage output,fit for wide voltage range(±15%)Controlled by electronic ...