* 32 bitmicom of STM32 series is used so it is possible to realize perfect digital control fast. * Monitoring overheat, over current and over voltage by microprocessor, Input power disconnection protective circuit built in. * Stable output is maintained even at +_15% change in input power. *Parameter is applied at the time of arc starting and closing, so soft arc is made and neatly welded . * Digital current and voltage feedback circuit is applied so a stable bead pattern is realized. * Interface, which can transmit the welding conditions by wire or wireless on a real - time basis, is built in it so it is possible to monitor on a real time basis. * The time of using welding machine is saved in the main PCB by situation and the function of managing welding facilities is built in it. * A power socket for the connection of a working light in a wire feeder is available so it is convenient to work at night.