resistance welding

Metallurgy is the art and science of extracting metals from their ores and modifying them for use. It also involves understanding the chemical, physical, and atomic properties of metals and how they form alloys.1

Resistance welding is a method of electric pressure welding where heat is generated by the flow of current through the parts being joined. Pressure is applied simultaneously with the current to create the weld. This technique, along with gas and arc welding, emerged in the late 19th century and became crucial during World War I and II for large-scale fabrication. Resistance welding, invented by Elihu Thomson, is particularly effective for spot and seam joining of sheet metal.23