Summary of Basic Knowledge Points in Spot Welding Process

When there is oil, moisture, paint, oxide film, and other dirt on the surface of the welding component, the surface contact resistance increases sharply and fluctuates over a large range, directly affecting the stability of welding quality. To ensure stable joint quality, the surface of the workpiece must be cleaned before spot welding (including projection welding). When there is oil, moisture, paint, oxide film, and other dirt on the surface of the welded part, the surface contact resistance increases sharply and fluctuates over a large range, directly affecting the stability of welding quality. To ensure stable joint quality, the surface of the workpiece must be cleaned before spot welding (including projection welding).