The Lincoln multi-process welder Invertec V350 PRO Description: Exceptional Multi-Process Fabrication Welding; 5-425 amp output range - For all recommended processes from DC TIG to arc gouging; All input voltages and frequencies are both single and three phase rated - No output derating necessary on single phase; Low power consumption for energy savings - 88% efficiency; Rugged skid and tube handles - For convenience and added protection.