... arc function. 5. Well welding quanlity, deep pond, high intensity. 6. Can long time continuan work, stable perfomance, high duty cycle ... :60%Efficiency:85%Class of Insulation:FApplied welding Rod:1.6-2.5mmCase protection Degree:IP21Power Factor(cos φ):0.85Weight:3 ... on.Compact,portable,highly effective,low consumption,energy saving. one pcb arc dc inverter mma-120I welding machines