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The spot welding technology of the spot welder is a resistance welding method. The welding piece is assembled between two electrodes, and the base material is melted by resistance heat to form a welded joint. Spot welding is mainly used for the connection of thin plates such as aircraft skins, aviation engine cigarette cans, and automobile cabin shells. The welding transformer of the spot welding machine is a spot welding machine, and its secondary circuit has only one circuit. Upper and lower electrodes and electrode arms are used to conduct welding current and transmit power. The cooling water passes through transformers, electrodes and other components. To avoid heating and welding, connect the cooling water first, and then the power switch. The quality of the electrode directly affects the welding process, welding quality and production efficiency. The electrode material is usually made of copper, cadmium bronze, chrome bronze, etc. The shape of the electrode is various, mainly determined by the shape of the weldment. When installing the electrode, care should be taken that the upper and lower electrode surfaces are kept parallel; the electrode surface should be kept clean, and the electrode surface should be trimmed with emery cloth or file.