Shot welding

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Shot welding is a type of electric resistance welding which, like spot welding, is used to join two pieces of metal together. The distinguishing feature is that in shot welding, strips and sheets of metal (usually stainless steel) are "sewed" together with rows of uniform spot welds.^[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. Shot welding was patented by Earl J. Ragsdale, a mechanical engineer at the Edward G. Budd Manufacturing Company in 1932 to weld stainless steel. This welding method was used to construct the first stainless steel train, Pioneer Zephyr, in 1934,^[1] and became the standard construction technology for railroad passenger cars thereafter.