... cycle. Materials: Steel, copper Electrode type: acid,al ZX7 Series Inverter DC Arc Welding MachineWith advanced PWM control technologySmall in size, firm ... rodMaterials: Steel, copperElectrode type: acid, alkali, refractory steel and celluloseSpecification:Model ZX7-160ZX7-200ZX7-250ZX7-315ZX7-400ZX7-500ZX7-630Rated input voltage ...