At present, the welding technology of water-cooled plate is mainly vacuum brazing and FSW welding. Vacuum brazing and FSW, as two advanced welding technologies, are widely used in different fields and have many advantages, but they also have certain differences and focuses. For example, they each have advantages for radiator and water cooling plate applications.
FSW(Friction Stir Welding)
FSW is a method of generating heat through friction of the stirring head to make the base metal reach a molten state to complete the welding, which belongs to solid phase welding. However, due to the limitations of the characteristics of the welding method, the current cold plate industry is limited to simple welding trajectories, such as welding of flat structures or cylindrical structures, and the workpiece must be well supported and cushioned during the welding process. For small workpieces, human factors have a great impact on the quality.
Vacuum brazing
Vacuum brazing is a welding method in which the base metals are joined together by melting the solder below the melting point of the base metal under vacuum conditions. Suitable for mass production. The performance of the product is not affected by human factors.
Vacuum brazing is mainly used in electrical instrumentation and national defense industries, such as large oxygen generators, complex-shaped heat exchangers (oil coolers, evaporators and radiators, etc.) used in automobiles and ships. The complex-shaped honeycomb structure, electrical parts, and precision mechanical parts in jet engines must be brazed. In recent years, the development of brazing T art has been very rapid, and the brazing technology has been developed from the original application in aircraft, nuclear energy and other defense industries to ordinary metals and practical components.
The more complex the process, the larger the batch of welding, the more advantage of vacuum brazing.
For high-power water-cooled plate technology, especially for low-flow and high-pressure water-cooled plates, the design structure is complex, and the welding trajectory is not easy to control. Only vacuum brazing technology can be used to ensure it.
If FSW welding is used here, it will inevitably sacrifice internal stress and water at the bottom, and the risk of large difference in flow resistance. Because FSW cannot realize that each runner fin can be physically connected to the upper and lower surfaces of the cold plate, it can only be welded in places with large spans. It will inevitably cause continuous mechanical stress due to the internal force of the fluid, and the long-term use may have the potential of arching the heat dissipation surface. And the place without solid welding is easy to get water, resulting in uneven flow resistance.
Vacuum brazing uses a welded composite plate to connect the flow channel and the cold plate into an entity. Good consistency in mass production performance. The controllability is strong, and the welding process and assembly process are all controlled by numerical control. Has the advantage of batch performance stability.
The welding process of water-cooled plates in the electronics industry is mainly vacuum brazing. At present, 80% of batch products use vacuum brazing. FSW technology is only used in the design of water-cooled radiators in the simple sealing plate class. This is determined by the design process of the water cooling plate. It is also determined by the inherent characteristics of welding technology.
Vacuum brazing liquid cold plates factory
Changzhou Sanqian Technology Co., Ltd. is a professional manufacturer of water cooling panels, specializing in the research and development, manufacturing, processing, production and sales of various cooling systems. The company has complete equipment, advanced production technology, complete varieties and reliable quality.