Why is it necessary to clean a joint after brazing?

Cleaning a joint after brazing is essential primarily to remove flux residues, which are chemical compounds used during the brazing process to prevent oxidation and ensure the molten filler metal flows into the joint. If left on the joint, these flux remnants can lead to corrosion over time, compromising the integrity and longevity of the joint and the entire plumbing system.

The importance of removing these substances cannot be overstated, as they can attract moisture and cause degradation of the materials involved in the joint, leading to potential leaks or failures. Ensuring a clean surface after brazing helps maintain the reliability and performance of the plumbing system, making this step a critical part of the process.