ZX7 250 Inverter DC arc welding machine rates input:380V/15A No- ... devoice which can made high quality wekding ,the inverter frequency up to 20Hz,speedy dynamic response,easy ... thrust adjustment,resistant to welding electrode adtherence,appicable for various acids and basic electrodes welding,cellulose ... electrodes dowm hand welding is avallable.6.Applicable for welding of all kinds of ferrous metals ...