Brazing refers to the use of metal materials with lower melting points than the parent material as brazing filler metal, heating the weldment and the brazing filler metal to a temperature higher than the melting point of the brazing filler metal and lower than the melting point of the parent material, using the liquid brazing filler metal to wet the parent material, fill the joint gap and diffuse with the parent material to achieve the connection of the weldment. In the manufacture of Silver Contact Brazed Assemblies, the brazing process is particularly important because it can ensure efficient electrical connection and stable performance.
During brazing, the contact surfaces of the brazed workpieces are cleaned and assembled in an overlapping form, and the brazing filler metal is placed near the joint gap or directly into the joint gap. When the workpiece and the brazing filler metal are heated to a temperature slightly higher than the melting temperature of the brazing filler metal, the brazing filler metal will melt and wet the surface of the weldment. The liquid brazing filler metal will flow and spread along the joint with the help of capillary action. The brazed metal and the brazing filler metal will dissolve and penetrate each other to form an alloy layer, and the brazed joint will be formed after condensation, which is crucial for Copper Spot Welding Silver Contact because a stable joint can ensure smooth current conduction and contact reliability.
In order to make the brazed parts firmly connected and enhance the adhesion of the brazing material, a brazing flux is used during brazing. The function of the brazing flux is to remove the oxides on the surface of the brazing material and the base material, protect the weldment and the liquid brazing material from oxidation during the brazing process, and improve the wettability of the liquid brazing material to the weldment. This is especially important for Brazing Silver Contacts to Copper, because it requires the joint to have extremely high stability and low contact resistance in high-frequency electrical conduction.
There are two types of commonly used brazing materials: one is hard brazing material with a melting point above 450°C. Commonly used brazing materials include copper-based, silver-based, aluminum-based, nickel-based and other alloys. In Brazed Electric Contacts, silver-based brazing materials are often used to ensure the long-term stability of electrical connection components. The heating sources for brazing include torch flame, resistance electric heating, induction heating, salt bath heating and furnace heating. The brazed joint has high strength and is suitable for brazing workpieces with large forces or high working temperatures, such as carbide tools, bicycle frames, etc. This type of brazing is usually called brazing. The other type is solder, which has a melting point below 450°C and is widely used in low-temperature conditions and applications that do not bear large forces, such as containers and instrument components, and is usually called soft soldering.
The characteristics of brazing are smooth joint surface, good airtightness, stable shape and size, little change in the structure and performance of the weldment, and can connect the same or different metals and some non-metals. In the application of Brazing Silver Electrical Contacts, brazing not only ensures reliable electrical performance, but also improves the long-term service life of welded parts. During brazing, the workpiece can also be heated as a whole, and many welds can be welded at one time, thereby improving productivity. Although the strength of the brazed joint is low, the strength of the joint can be effectively improved by using lap joints and increasing the lap length.
