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Welding is the process of joining metal parts using various fusible alloys. The melting point of the solder is lower than that of the material to be welded, so that the part will not be melted, through the intermolecular contact on its surface to complete the welding.
Welding can be divided into soft welding and hard welding. The temperature of soft welding is lower than 450°C, and the temperature of hard welding is higher than 450°C. Hard welding is usually used for metals such as silver, gold, steel, copper, and its welding point is much stronger than soft welding, and its shear strength is 20 to 30 times that of soft welding. The above two types of thermal connections usually use the term soldering, because in both cases molten solder is written into two elongated gaps between the clean and close solid metal surfaces of the device.

Welding ensures the continuity of the metal. On the one hand, the two metals are connected by bolts or physical attachments to each other, showing a strong metal whole, but this connection is discontinuous. Sometimes if there is an oxide insulating film on the metal surface, they may even Right or wrong in physical contact. In addition, vibrations and other mechanical shocks can also loosen the joints. Welding eliminates these problems, the welding part does not move relative to each other, the contact surface will not be oxidized, and the continuous conduction method can be maintained. Soldering is a process of fusion between two metals. In the molten state, the solder will dissolve some of the metal in contact with it, and the surface of the metal being soldered often has a thin oxide film that cannot be dissolved by the solder. Flux is used to remove it. This layer of oxide film.
The above is the editor's description of Automatic fence mesh welding machine: an introduction to relevant knowledge about welding machines.