Features EASY TO USE: The spot welding control board is easy to install. Design a reliable 0 junction detection circuit to ensure accurate SCR phase move. EASY OPERATION: The 100A spot welding control board has professional parts, tools, safety machine modules, and digital current control, which can be set through the indicator light on the display panel. STM8 MICROCONTROLLER: The current controller adopts STM8 microcontroller, designed specifically for DIY or simple resistance welding. SAFE OPERATION: The 100A spot welding control board is isolated from the optocoupler, achieving strong, weak current and safe operation. LONG SERVICE LIFE: Spot welding control is made of electronic components, safe, heat resistant, and has a long service life. Specification: Item Type: Spot Welder Board Material: PCB Color: Red Specification: 100A Application: The control panel of the spot welding machine is an independently developed controller for DIY or simple resistance welding. Package List: 1 x Spot Welder Board 2 x Nut   2 x Washer Package List 1 x Spot Welder Board 2 x Nut 2 x Washer