Cold welding is the application of mechanical force, molecular force or power to make welding material diffusion to the surface of a process equipment (method). At the microscopic scale, this phenomenon is closely related to the diffusion of atoms on the surface of the material.

Cold welding machine can be divided into welding, cold welding machine, paste-type repair of cold welding, welding copper and aluminum wire cold welding machine. The former two are used to repair metal, casting surface wear, scratches, porosity, trachoma and other small defects; the latter for welding copper wire, aluminum and other non-ferrous metal wire, such as motor welding enameled wire.

Due to the cold welding difference and the traditional sense of welding, cold solder hardness, adhesion and strength is particularly high, almost no shrinkage, can reliably prevent many chemical effects, physical stress and mechanical stress, it is also called "liquid metal". The use of reasonable technology, select the appropriate chemical bonding materials (adhesives, sealants, retaining agent, repair agent, etc.) will be the same material or dissimilar materials connected together to achieve connectivity, sealing, holding, functional coating, One of the main applications currently.

Cold welding can be used for all metals and almost all other raw materials to connect with each other, fixed welding and sealing, hardening and metal can file, planing, grinding, milling, polishing, cars, shot peening, Kinds of tools for processing. For the repair of old equipment, to reduce the manufacturing process of waste defective, is of great significance. Moreover, the connection of some materials with the general welding method, because the welding temperature is high, not only detrimental to the strength of the material, but also easy to deformation, especially for thin material even more problematic. However, these problems do not exist for cold welding, because the cold welding is carried out at room temperature, while the stress of the joints can be more evenly distributed in all the plastic surface, thereby improving the metal due to welding, riveting, bolting caused by Of the above part of the problem, increased fatigue life.

With the application of cold welding technology is mature, polymer composites cold welding applications are more stable and widespread, and nano-materials between the cold welding is gaining more and more attention, including nano-assembly and advanced manufacturing, biosensor, the next Generation microelectronic components and chip interconnect technology.