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By using the resistance heat and a large amount of plastic deformation energy of the welding zone, two separated metal atoms are close to the lattice distance to form a metal bond, and a sufficient amount of common grains are produced on the joint surface to obtain the solder joint, weld joint or butt joint.

It is a connection method with stable welding quality, high production efficiency and easy to realize mechanization and automation. It is widely used in automobile, aerospace, electronics, home appliances, office and other fields.