Shot welding

[1] The weld is achieved by clamping the two pieces together then passing a large electric current through them for a short period of time.

In the early 20th century, the Edward G. Budd Manufacturing Company had been innovative in the field of sheet metal fabrication, and had revolutionized the construction of automotive bodies in steel during the 1920s.

[2] Heat treating the 18-8 stainless steel leaves the metal with non-magnetic and ductile properties.

The metal becomes susceptible to corrosion due to carbide precipitation, and loses fatigue resistance.

Good shotwelds have twice the shear strength of a rivet of similar diameter and can be placed 50% closer together.