Upset welding is a type of resistance welding process used to join two metal parts together by generating heat through the resistance of the materials. In upset welding, two workpieces are brought together under pressure. An electric current is passed through the interface of the materials, causing localized heating at the contact point due to electrical resistance. Once the materials reach their melting temperature, they are upset (compressed) further to create a solid bond as the molten area cools and solidifies.
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