Working principle of friction welding machine

Friction welding refers to the method of using the heat generated by the friction of the workpiece contact surface as a heat source to make the workpiece plastically deformed under the pressure. Under the action of pressure, the relative motion between the welding contact end faces is used to generate frictional heat and deformation heat at and around the friction surface under constant or increased pressure and torque. The range is close to but generally lower than the melting point, the deformation resistance of the material is reduced, the plasticity is increased, the interface oxide film is broken, and the solid welding method is formed through the interface under the effect of upsetting pressure, plastic deformation and flow accompanying the material, molecular diffusion and recrystallization, To achieve welding. The metal surfaces of mechanical parts are often bonded and welded due to friction. In the process of metal processing and high-speed rotation of machine tools , it is often found that the surfaces of two metal parts are welded together due to friction and heat. For example, in the turning process, a built-in chip is generated on the turning tool; in the drilling process, the drill bit and the workpiece are often bonded together; the sliding bearing is stuck due to combustion shaft and other reasons.

The evolution of welding technology welding technology is produced with the smelting production of copper, iron and other metals and the application of various heat sources. Ancient welding methods mainly include casting, brazing, forging and riveting.

The 50 ~ 60mm steel plate can be welded and formed at one time, the welding speed can reach more than 0.4m / min, and the deposition speed is more than 100 times that of electrode arc welding. The second method is to reduce the cross-section of the trench and the metal cladding.

When used to manufacture aircraft landing gear, foreign regulations do not allow fusion welding.

Advantages of welding Welding, also known as welding and splicing, is a manufacturing process and technology that connects metals or other thermoplastic materials (such as plastics) by heating, raising, or high pressure. Brazing—A metal material with a lower melting point than the base material is used as the brazing material. The base material is wetted by the liquid brazing material to fill in the joint gap, and the base materials diffuse with each other to realize the connection of the weldment. Modern welding has many sources of energy, including gas flames, arcs, lasers, electron beams, friction, and ultrasound. Welding is dangerous to the operator, so appropriate precautions must be taken when welding.

Manual arc welding using consumable electrodes as electrodes developed in the 1950s and quickly became the most popular metal arc welding technology. In 1957, flux cored arc welding first appeared, and its self-shielding wire electrode can be used for automatic welding, greatly increasing the welding speed.

Disadvantages and limitations of friction welding: Friction welding is mainly a method of rotating butt welding of workpieces. Disc-shaped workpieces and thin-walled pipe fittings are difficult to weld because they are not easily clamped.