Which factor can contribute to corrosion in brazed joints?

One of the significant factors that can contribute to corrosion in brazed joints is improper flux application. Flux plays a crucial role in the brazing process by cleaning the surfaces being joined and preventing oxidation during heating. If the flux is not applied correctly, it may not effectively remove contaminants or oxides from the metal surfaces. This can lead to poor wetting of the filler metal, creating areas where corrosion can initiate and progress.

Additionally, if excess flux remains after the brazing process and is not properly removed, it can retain moisture and other corrosive agents, further increasing the susceptibility of the joint to corrosion. Proper application and removal of flux are essential to maintain the integrity and longevity of brazed joints by minimizing the risk of corrosion.

Other factors, such as the selection of appropriate filler metals, heating schedules, and joint designs, can certainly influence the overall quality and strength of a brazed joint, but it is the flux application that is particularly critical in preventing corrosion.