The difference between pressure welding and friction welding.

Pressure welding and friction welding are both solid-state welding methods that achieve welding by applying pressure, but they have significant differences in principle, applicable materials, and application scenarios.

Pressure welding is a broad concept that refers to applying pressure to the workpieces during the welding process, causing the joint to deform or melt and then bond together. It includes various specific methods, such as resistance welding, ultrasonic welding, and diffusion welding. Pressure welding has a very wide range of applications and can be used to weld various metals and non-metallic materials, including steel, aluminum, magnesium and other non-ferrous metals and their alloys, and stainless steel.

Friction welding is a specific form of pressure welding that utilizes the heat generated by the friction between the surfaces of the workpieces to achieve metal joining. During the welding process, the two workpieces are first pressed together with a certain pressure, with one workpiece fixed and the other rotating at high speed. When the temperature at the joint reaches the welding temperature, the rotation is immediately stopped and a larger forging pressure is applied, causing a certain amount of forging deformation, and the two workpieces are welded together. Friction welding has the advantages of stable welding quality, high productivity, suitability for welding dissimilar metals, and low processing costs. It is mainly used for welding metal rods, plates, tubes, and other materials, and is especially suitable for welding dissimilar metals and dissimilar steel products, such as copper-aluminum transition joints in the power industry and high-speed steel-structural steel tools for metal cutting.

Main differences:

Principle: Pressure welding achieves bonding by applying pressure to deform or melt the workpiece joint, while friction welding utilizes the heat generated by the friction between the surfaces of the workpieces to achieve metal joining.
Applicable materials: Pressure welding has a wider range of applications and can be used to weld various metals and non-metallic materials; friction welding is mainly used for welding metal materials, especially suitable for welding dissimilar metals and dissimilar steel products.
Application scenarios: Pressure welding is widely used in the welding of components in aerospace, electronics, automotive, and home appliance industries; friction welding is mainly used for welding metal rods, plates, tubes, and other materials, as well as welding dissimilar metals and dissimilar steel products.