... ,ISO9000,ROHS,approved IGBT technology welding machine MCU + DSP digital control small welding deformation welding machineMCU + DSP digital control, control waveform exactly, one pulse drop ... , ease of movement., against dust and rain.Pulse MIG/MAG WELDING MACHINEDigital TERTION 3500 Digital TERTION 4000Digital TERTION 5000Input Voltage AC.(three phase) 220V ...