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

In silver brazing, if flux remains in the joint area, it can lead to corrosion over time. Fluxes are designed to prevent oxidation of the base metals during the brazing process and to facilitate the flow of the filler material. However, residual flux left in the joint after brazing can attract moisture and other contaminants, which can initiate a corrosive reaction on the base metals. These corrosive effects can undermine the integrity of the joint, potentially leading to failure over time.

While flux initially plays a crucial role in preparing and assisting the joint during the brazing process, proper cleaning after the brazing operation is essential to ensure the longevity and reliability of the joint. Therefore, ensuring that all flux residues are cleaned away helps protect the joint from potential corrosion issues that can arise from residual flux.