The welding process must exert pressure on the weldment, which belongs to the processing of various metal materials and some metal materials. A metal material with a melting point lower than that of the base metal is used as the solder, and the base metal is wetted by the liquid solder to fill the joint gap, and the welded part is connected by mutual diffusion with the base metal. Suitable for welding of various materials and different metals or heterogeneous materials.
Extended data:
The seam formed when welding and connecting two connectors is called weld. When welding, both sides of the weld will be affected by welding heat, and the structure and properties will change. This area is called the heat affected zone.
When welding, the workpiece material, welding material and welding current are different. It is necessary to adjust welding conditions to deteriorate solderability. Preheating, temperature maintenance during welding and post-welding heat treatment can improve the welding quality of weldments.
After welding, the temperature should be kept at 200-350℃ for 2-6 hours to further slow down the cooling rate, increase the plasticity and toughness, reduce the hardening tendency and eliminate the diffusion of hydrogen in the joint. Therefore, welding should not be carried out in too cold environment or when it rains.
It is best to carry out stress-relieving heat treatment on weldments immediately after welding, especially for weldments with large thickness and high rigidity structure and weldments working under harsh conditions (dynamic load or impact load). The tempering temperature for stress relief after welding is 600 ~ 650℃, and the temperature is 65438±0-2h, and it is cooled with the furnace.