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Tungsten Carbide Brazing
Tungsten carbide parts are usually connected to steel and other materials by brazing. Brazing involves placing a metal brazing alloy together with flux between the parts to be connected, and then heating the assembly until the brazing alloy melts and flows to completely fill the small gap between the two parts. Welding is similar to brazing, but is carried out with a lower melting point alloy at a lower temperature. However, welded joints generally lack mechanical or thermal strength to meet the requirements of many applications.
Although many fluxes determine the quality and strength of the bond between two brazed components, paying attention to some important principles usually produces satisfactory results. Carbide and steel parts must be cleaned so that the molten brazing alloy completely wets the surface and forms a strong chemical bond with each other. Tungsten carbide components are usually sandblasted, polished or ground to form a clean new surface, or electroplated or treated in a salt bath to prepare the surface for brazing. Similarly, steel components must be steam degreased or cleaned with solvents or corrosive solutions. The presence of any residual grease, oil, oxidation, dirt, or other surface contaminants will adversely affect the infiltration of the copper alloy on the surface of the part and cause the quality of the joint to deteriorate. Various tests for the flow of molten solder on the surface* of the part are usually used to evaluate the “brazability” of the part. However, the relative importance of clean surfaces will vary with the design and application of brazed components.
Under normal conditions, all common brazing alloys from pure copper to silver alloys will easily wet the cemented carbide surface. Popular brazing alloys (shown in parentheses are the name of the American Welding Society) are composed of approximately 50% silver, including cadmium (BAg-6), cadmium-free (BAg-24), and manganese (BAg-22) And tin alloy (BAg-7). These alloys have a melting point between 1150℃ and 1300℃ and can be purchased in wire, rod, or ribbon form, or as three-metal brazing, in which a copper gasket is “sandwiched” between two layers of silver alloy.
For high temperature applications, copper is usually used as a brazing material. Although the tensile strength of copper is lower than that of silver alloys at room temperature, copper can still maintain most of its strength at temperatures close to 1000℃. If brazing is performed in an oxidizing environment, borax is a copper flux. However, generally, copper brazing is performed in a hydrogen atmosphere that does not require flux. Other high-temperature brazing includes high-nickel alloys that contain some chromium, boron, and silicon. The flow temperature of these alloys exceeds 1800℃. It should be noted that higher brazing temperatures may cause grain growth or other undesirable changes in steel parts.
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Shanghai Geheng Vacuum Technology Co., Ltd. is a vacuum heat treatment furnace manufacturer with many years of experience in design, manufacturing and production. Mainly produce vacuum heat treatment furnace, vacuum sintering furnace, vacuum brazing furnace, New Energy And Environmental Protection Equipment and other vacuum equipments.Provide customized services, equipment work area can be based on customer output.
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