What is a welding machine?
Welding machine is the use of a variety of fusible alloy (solder) to connect the process of metal parts. The melting point of the solder is lower than that of the material being welded, so that the part will finish the welding through the contact between the molecules on the surface without melting.
Welding machine can be divided into soft welding and hard welding, soft welding temperature below 450 ℃, hard welding higher than 450 ℃. Hard welding is usually used for silver, gold, steel, copper and other metals, the welding point is much stronger than the soft welding, shear strength for the soft welding of 20-30 times. The above two types of heat connections are usually used in terms of welding, since both of these are written in the slender welds of the clean and close solid metal surfaces of the two devices to be melted.
The welding machine ensures the continuity of the metal. On the one hand, the two metals are interconnected with each other by bolted or physical attachment, showing a strong metal as a whole, but this connection is discontinuous, and sometimes the surface of the metal, if there is an oxide insulating film, Right or wrong physical contact. Another drawback of mechanical coupling and welding is that the contact surface continues to oxidize and cause resistance to be added. In addition, the vibration and other mechanical shock can also make the joints loose. Welding is to eliminate these problems, the welding site does not occur relative movement, the contact surface is not oxidized, continuous conductive method to adhere to. Welding is the process of fusion between two metals, the solder in the molten state, will dissolve some of the metal in contact with the metal surface is welded with a thin layer of solder can not dissolve the oxide film, the flux is used to remove This layer of oxide film. The welding process typically includes:
1) the melting of the flux, thereby removing the oxide film on the surface of the metal to be welded;
2) melting the solder to suspend the impurity between them and the lighter flux to the surface;
3) some to dissolve some of the metal connected with the solder;
4) cool and end the melting of the metal with the solder.