Shot welding
（重定向自Shotwelding）
Shot welding is a specific type of spot welding used to join two pieces of metal together. This is accomplished by clamping the two pieces together and then passing a large electric current through them for a short period of time. Assuming the right amount of current for the right time, this will weld the two pieces of metal together. Shot welding was invented by Earl J. Ragsdale, a mechanical engineer at the Budd Company, in 1932 for the purposes of welding stainless steel. This welding method was used to construct the Pioneer Zephyr.