Spot welding joins thinner materials such as sheet metal and wire mesh, and it is less likely to damage these materials than arc welding or soldering. Also known as resistance spot welding, spot welding is commonly used in auto body assembly and repair. Spot welding tongs each connect to a power source that supplies current to the tongs. The tongs clamp a workpiece to hold a joint together and provide pressure for the welding process. The tongs have two spot welding tips that conduct electric current from the tongs to the joint to melt and fuse the material at the joint and create the weld.