1.High power factor 2.low need of electricity 3.good weld shape 4.duty cycle is 100% 5.wide adjustable range IGBT inverter automatic submerged-arc welding machine Certifications:Features:1,Advanced soft switch inverter technique can solve the IGBT easily broken problem.2,The duty cycle is 100%, suitable for long time high current work.3,High power factor; low need of electricity.4,Can be used in ...