Metal Lock Key Butt Welding Machinery , AC pulse Resistance Spot Welder DESCRIPTION This machine could choose the function of three times discharging. As for medium carbon steel, this machine possesses the function of preheat and welding anneal and is specially equipped with parallel straight slideway to ensure the parallel pressure of forging power of the welding product so as to achieve smoothness and firmness on the connecting position. Except for the general functions of