Advanced invert technology,simple circuit,compact,light,high efficiency and energy saving. Strong power line compensate ability,anti-power supply fluctuation,steady welding current,reliable performance. Small DC arc welder uses scale trust technology,single knob adjustment,easy operation. No load loss less than 100W, compared with traditional welder,energy saving up to 50%. Invert frequency up to 100KHZ, high speed of dynamic response,easy arc starting,steady arc,anti interference,low noise,small splash,deep welding pool,good quality. suit for low carbon steel,mid carbon steel and alloy steel,all ferrous metal can get good quality welding seam, widely used for oil pipeline,petrochemical,car,shipbuilding,bioler,nuclear electricity,space flight,war industry,bridge building and outdoor working.