The principle of silicone controlled phase shifting triggering is adopted to adjust the time and the current to achieve the purpose of welding. Strong and weak electricity is isolated by optocoupler, to operate. This control panel of the spot welding machine is independently developed for the DIY or the simple resistance welding. Equipped with digital display, you can see the time and current directly, simple and easy to use. Using high precisions single bit potentiometer, to reliable and convenient input., Manufacturer: Littimoon