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Resistance welding refers to the method of using the resistance heat generated by the current passing through the workpiece and the contact area as a heat source to locally heat the workpiece while applying pressure for welding. During welding, there is no need to fill metal, resulting in high productivity, minimal deformation of the welded parts, and easy automation. Resistance welding is a type of welding method that uses resistance heat as the energy source, including electric slag welding using slag resistance heat as the energy source and resistance welding using solid resistance heat as the energy source.

Resistance welding is a method of forming a metal bond by heating the workpiece to a molten or plastic state through the resistance heating effect generated by the current flowing through the contact surface and adjacent areas of the workpiece. There are four main methods of resistance welding, namely spot welding, seam welding, projection welding, and butt welding.

Resistance welding is divided into three forms: spot welding, seam welding, and butt welding.

(1) Spot welding: Press the weldment between two cylindrical electrodes, apply electric heating to melt the weldment at the contact point to form a fusion nucleus, then cut off the power and solidify under pressure to form a dense welded joint.

Spot welding is suitable for welding thin plates (lap joints) and steel bars below 4 mm, and is widely used in the production of automobiles, airplanes, electronics, instruments, and daily necessities.

(2) Seam welding: Seam welding is similar to spot welding, except that a rotating disc-shaped electrode is used instead of a cylindrical electrode. The stacked workpiece is pressurized and energized between the disks, and is fed in with the rotation of the disks, forming a continuous weld seam.

Seam welding is suitable for overlapping thin plates with a welding thickness of less than 3mm, mainly used in the production of sealed containers and pipelines.

(3) Welding: According to different welding processes, welding can be divided into resistance welding and flash welding.