Spot welding is a type of electric resistance welding used to weld various sheet metal products, through a process in which contacting metal surface points are joined by the heat obtained from resistance to electric current.

What is a spot welder used for?

Spot welding (also known as resistance spot welding) is a resistance welding process. This welding process is used primarily for welding two or more metal sheets together by applying pressure and heat from an electric current to the weld area.

How strong is a spot weld?

This weld has a shear strength of 1100 lbs. (499.5kg) less than the fully penetrated weld. For a full penetrating spot weld on a given plate thickness, the area of the interface will depend to a large extent on the shielding gas and the arc voltage.