Features：
■ Both power source and tractor DSP all-digital control and digital communication
■ With expert database, and 30 saving channels
■ Menu and functions LCD display and control, easy to operate
■ Start-arc anti-stick, auto wire back while arc stops
■ Digital display and presetting of current, voltage and marching speed
■ AC frequency and duty ratio adjustable
■ AC/DC power source and DC power source work simultaneously without affecting each other