Introduction to welding machine welding can be divided into soft welding and hard welding, soft welding temperature is lower than 450 ° C, hard welding is higher than 450 ° C. Hard soldering is usually used for metals such as silver, gold, steel, copper, etc. The solder joints are much stronger than soft soldering, and the shear strength is 20 to 30 times that of soft soldering. The above two types of thermal joints generally use the term soldering because in both cases the molten solder is written into the elongated gaps of the clean and near solid metal surfaces of the two devices to be installed.
Welding ensures the continuity of the metal. On the one hand, the two metals are connected to each other by bolting or physical attachment, which is expressed as a strong metal whole, but the connection is discontinuous, and sometimes the surface of the metal has an oxide insulating film, even Right or wrong physical contact. Another drawback compared to soldering is that the contact surface continues to oxidize and the resistance is added. In addition, chatter and other mechanical shocks can also loosen the joint. Welding eliminates these problems, the welding parts do not move relative to each other, the contact surfaces do not oxidize, and continuous conductive methods are adhered to. Welding is a process of fusion between two metals. In the molten state, the solder will dissolve some of the metal in contact with it, while the surface of the metal to be welded often has a thin layer of oxide film that cannot be dissolved by the solder. The flux is used to remove it. This layer of oxide film.