... heavy duty welding machine 1,low price, energy saving. 2,mosfet design 3,Welding thickness:2.0-12.0 ZX7-400amp heavy ... duty welding machine A.Feature and Application 1.Advanced ... up to 50% .11.Replacing of welding machine ZX5&BX series. B.Main Specification Power ... specific requirements F.Two stage quality control 1,Machine Adjustment, test the inner components to maintain ...