There could be several reasons why your brazing rod is not sticking to copper.
1. Lack of Flux: Flux is a substance that helps remove oxides from the surface of the base metal and promotes the flow of the filler metal. If you are not using flux specifically designed for copper, such as copper flux (plumbers flux), it may not be effectively removing the oxides and allowing the filler metal to adhere to the copper surface. Make sure to apply the appropriate flux before brazing.
2. Insufficient Heat: Brazing requires heating the base metal and filler metal to a specific temperature where the filler metal melts and flows into the joint. If the base metal, in this case copper, is not reaching the required temperature, the filler metal will not melt and bond properly. Ensure that you are heating the copper sufficiently to reach the melting point of the brazing rod.
3. Incompatible Filler Metal: The filler metal you are using may not be suitable for brazing copper. It is important to use a filler metal that has a lower melting point than the materials being joined. If the filler metal's melting point is higher than the copper, it will not melt and bond properly. Check if the brazing rod you are using is specifically designed for copper brazing.
4. Surface Contamination: Any contaminants, such as dirt, grease, or oxides, on the surface of the copper can prevent the brazing rod from sticking. Clean the copper surface thoroughly before brazing to ensure proper adhesion.
5. Joint Design and Fit: The design and fit of the joint can also affect the success of the brazing process. The joint should have proper clearance and fit to allow the filler metal to flow and fill the gaps. If the joint design is inadequate, it may be difficult for the brazing rod to properly bond with the copper.
In summary, make sure to use the appropriate flux, heat the copper to the required temperature, use a compatible filler metal, clean the surface properly, and ensure a suitable joint design for successful brazing of copper.
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