In silver brazing, what happens if flux remains in the joint area?

In silver brazing, if flux remains in the joint area after the brazing process, it can lead to corrosion. Flux is used during brazing to prevent oxidation by removing surface oxides and creating a clean environment for the molten filler metal to flow into the joint. However, if flux residues are left behind, particularly if they are acidic or reactive, they can attract moisture and contaminants, leading to corrosion over time.

This is particularly concerning in environments where the joint will be exposed to moisture or chemicals. The presence of flux can create a weak point at the joint, as the corrosion process will degrade the integrity of the material, potentially leading to joint failure.

While flux does enhance the flow of the brazing material and aids in cleaning the surfaces before the process, these benefits are only applicable during the brazing process itself. Post-brazing, any leftover flux becomes a liability rather than an asset, emphasizing the importance of thorough cleaning after brazing to ensure the longevity and reliability of the joint.