Cold welding is the application of mechanical force, molecular force or power to diffuse welding materials to the surface of process equipment. On the micro scale, this phenomenon is closely related to the diffusion of atoms on the surface of materials.


Cold welding machine can be divided into welding, cold welding machine, cold welding paste repair, copper and aluminum wire cold welding machine. The former two are used to repair small defects such as wear, scratches, air holes and trachoma on the surface of metals and castings, while the latter is used to weld non-ferrous metal wires such as copper wire and aluminium wire, such as enameled wire for motor welding.


Because of the difference between cold welding and traditional welding sensation, the hardness, adhesion and strength of cold welding are very high, and there is almost no shrinkage. It can reliably prevent many chemical, physical and mechanical stresses, so it is also called "liquid metal". Using reasonable technology, choosing appropriate chemical bonding materials (adhesives, sealants, retainers, repairing agents, etc.) to connect the same materials or heterogeneous materials to achieve joint, sealing, retention, functional coating, one of the main applications at present.


Cold welding can be used to connect all metals and almost all other raw materials, fix welding and sealing, hardening and metal can file, planer, grinding, polishing, automobile, shot peening, various processing tools. It is of great significance for the maintenance of old equipment and the reduction of defects in waste manufacturing process. Moreover, the connection between some materials and general welding methods is not only unfavorable to the strength of materials, but also easy to deform, especially for thin materials, because of the high welding temperature. However, these problems do not exist in cold welding, because cold welding is carried out at room temperature, and the stress of the joint can be more uniformly distributed on all plastic surfaces, thus improving the metal, because the fatigue life of welding, riveting and bolt connection caused by the above problems increases.


With the development of cold welding technology, the application of polymer composites becomes more stable and widespread. More and more attention has been paid to nano-materials between cold welding, including nano-assembly and advanced manufacturing, biosensors, next-generation microelectronic components and chip interconnection technology.