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The increase in welding current of the automatic spot welding machine is not large, and it cannot affect the decrease in heat generation caused by the decrease in R. Whether the spot welding machine chooses a hard specification or a soft specification depends on the properties, thickness of the metal and the power of the welding machine used. The process of the spot welding machine is to turn on the cooling water; clean the surface of the weldment. When the workpiece and the electrode of the spot welding machine are fixed, the resistance of the workpiece depends on its resistivity. The welding time and welding current of the spot welding machine are within a certain range Can complement each other. Spot welders have upper and lower limits for the current and time required for metals with different properties and thicknesses. ---Zhongbang Welding Machine