Three reasons why you should use flux when brazing are:
1. Removal of oxides: Flux helps in removing oxides from the surface of molten solder and base metals. Oxides can form during the brazing process and can weaken the joint. By using flux, these oxides are removed, ensuring a stronger and more reliable joint.
2. Protection from oxidation: Flux also acts as a protective layer, preventing oxidation of the filler metals and base metals during brazing. Oxidation can weaken the joint and affect the overall quality of the brazed assembly. Flux forms a barrier between the metals and the atmosphere, preventing oxidation and ensuring a clean and strong joint.
3. Enhancement of interface activity and liquid solder wettability: Flux enhances the activity at the interface between the filler metal and the base metal. It promotes wetting, allowing the filler to flow over the metal parts to be joined. This improves the bonding between the filler and the base metal, resulting in a stronger joint. Flux also improves the wettability of the liquid solder on the base metals, ensuring better adhesion and a more uniform flow of the solder.
In summary, using flux when brazing provides several benefits, including the removal of oxides, protection from oxidation, and enhancement of interface activity and solder wettability. These factors contribute to stronger and more reliable joints, ensuring the overall quality of the brazed assembly.
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