Resistance welding is a more traditional welding process, it is through the current to generate resistance heat to connect metal workpieces together, widely used in modern industry.

Spot welding

Spot welding is divided into single-side spot welding, double-side spot welding, multi-spot welding and automatic spot welding. Different spot welding methods mainly depend on the material size of the part to be welded and your welding requirements.

Resistance spot welding conducts electricity through the upper and lower electrodes, placing the workpiece between the electrodes, and applying pressure to complete the welding of the metal sheet. It should be noted that the workpiece should be cleaned before welding, and the surface of the solder joint is smooth and pollution-free. This welding method is fast, the welding joint is strong, and it is easy to automate. However, it is limited to the overlap welding between relatively thin plates, and the range of welding products is limited.

Projection welding

Unlike spot welding, the projection welding process requires that one side of the workpiece welding area needs to have convex points, when the parts with projection and flat plates are pressurized by electric current, these convex points will form a plastic state and collapse, so that the two metal parts are connected together. This welding method generally uses flat electrodes, and the welding current is generally larger than spot welding.

Seam welding

Seam welding is continuous spot welding, seam welding electrode roller shape, just like a sewing machine working, seam welding working methods have continuous seam welding, intermittent seam welding and step seam welding. The roller electrodes roll and press on the workpiece to form a joint. This welding method has good sealing and is suitable for sealing and welding of metal parts such as drums and cans.

Butt welding

Butt welding is divided into two welding processes, resistance butt welding and flash butt welding.

Resistance butt welding: The main difference with spot welding is that when resistance butt welding, the 2 workpiece is placed, the current is the resistance heat generated by the contact point of the workpiece, rather than the electrode. When the workpiece joint forms a plastic state due to heat, the overforging pressure is applied to the workpiece, so that the workpiece joint fuses to form a firm joint. It is generally used for welding copper rods and steel wires with relatively small cross-sectional area.

Flash butt welding: The welding form is the same as resistance butt welding, but in the welding process, the metal quickly melts and sparks will be generated. This welding process is suitable for welding large cross-sectional workpieces, generally used for docking steel bars, aluminum alloys, copper and aluminum dissimilar metals.

The above is a brief introduction to the four types of resistance welding, resistance welding relative to other welding processes, is relatively rare for ordinary people, but it is indeed a very important welding process. If you are interested in resistance welding, you can follow us to learn more about the resistance process.