Friction welding usually consists of the following four steps: 1. Conversion of mechanical energy into thermal energy; 2. Plastic deformation of the material; 3. Forging force under thermoplasticity; 4. Intermolecular diffusion and recrystallization.
The biggest difference between friction welding and traditional fusion welding is that during the entire welding process, the metal to be welded gains energy and reaches a temperature that does not reach its melting point, that is, the metal is in a thermoplastic state. Forged solid phase connection.
Compared with traditional fusion welding, friction welding has high quality welding joints - it can achieve the same strength as the weld seam strength and the strength of the base material, high welding efficiency, stable quality, good consistency, and can realize welding of dissimilar materials, etc.
The origins of friction welding can be traced back to 1891 AD, when the first patent for this welding method was granted in the United States. The patent uses frictional heat to connect steel cables. Subsequently, Germany, the United Kingdom, the Soviet Union, Japan and other countries successively carried out the production and application of friction welding. Our country is one of the earliest countries in the world to study friction welding. As early as 1957, it successfully experimented with aluminum-copper friction welding. Over the years, friction welding has been highly valued by the manufacturing industry for its technical characteristics of high quality, high efficiency, energy saving, and pollution-free. In particular, new technologies for friction welding have been continuously developed, such as superplastic friction welding, linear friction welding, and friction stir welding. etc., making it increasingly widely used in high-tech fields such as aviation, aerospace, nuclear energy, and ocean development, as well as in industrial sectors such as electric power, machinery manufacturing, oil drilling, and automobile manufacturing.