... duty cycle. Materials: Steel, copper Electrode type: acid,al ZX7 Series Inverter DC Arc Welding MachineWith advanced PWM control technologySmall in ... rod, alkalescent rod, fibrin rod and refractory steel rodMaterials: Steel, copperElectrode type: acid, alkali, refractory steel and celluloseSpecification:Model ZX7-160ZX7-200ZX7 ...