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Welding is a manufacturing process and technology that uses heat, high temperature or high pressure to join metal or other thermoplastic materials such as plastics. According to the state of the metal in the welding process and the characteristics of the process, the welding methods can be divided into three categories: welding, pressure welding and braze welding.

Spot welding is a type of welding used to weld sheets of metal together by clamping the sheets together at a single point and passing an electric current through the point to melt the sheets together.