Using multiple circuit protection circuit, vibration effectively prevent because of unstable power supply, high load, wrong operation or damage because of his poor welding head lines.Soft open mode make big or bad welding head of vibration, low power to start first, then the power output, easy to start at the same time reduce the welding head because of instantaneous pulse vibration of crack.Digital display will decline speed pressure operation, the output amplitude, load current, the work cycle, job position, the digital counter, low fine-tuning and three groups of 1/100 timer, all through the digital display, master comfortable working conditions.