KR series weldiing machine main board Product Description ¡ñ using integrated circuit control; ¡ñ choose a wire diameter is core wire switching function; ¡ñ with simple unifying function, and there is strong pressure compensation network; ¡ñ there FTT, SOL, or self-locking arc, and other functions; ¡ñ use high-voltage, wire feeder slow arc; ¡ñ apply to dual-star circuit.