ZX7 250 Inverter DC arc welding machine rates input:380V/15A No-load volt:54V ... cycle:30V/250A@60% ZX7 SERISE1.Made of the advanced inverter power thchnical and impport IGBT model.It is the users ... quality wekding ,the inverter frequency up to 20Hz,speedy dynamic response,easy to arc initiation,resistant to interference,stable arc,low welding noice ...