DESCRIPTION Capacitor discharge spot welder uses capacitor to store energy and to release instantaneous current. In the meantime, it concentrates large current to pass through a small point and then achieves welding effect (welding process passes through thousands of ampere current within 1/1000 second of time). Therefore, it can minimize the situation that the work piece being oxidized or mechanically deformed due to overheat during the process of welding. The output of the