What is the recommended practice if a joint has been touched by flux during brazing?

When brazing, the use of flux is essential to prevent oxidation and facilitate the flow of the filler metal. However, if flux has come into contact with a joint, it is crucial to ensure that it is properly handled afterward, as flux can lead to corrosion if not removed. The recommended practice is to allow the joint to completely cool before cleaning it.

Cooling the joint completely is important because it helps to stabilize the brazed joint, reducing the risk of distortion or weakening that could occur during the cleaning process if done while the joint is still hot. Cleaning while it's still hot can also result in flux residues being more stubbornly adhered to the surface, making it difficult to remove and potentially damaging the joint.

After the joint has cooled, using an appropriate solvent can effectively remove the flux, ensuring that the joint is clean and free from any remnants that could compromise its integrity. Thus, allowing the joint to cool completely before cleaning is a crucial step in maintaining the quality and longevity of the brazed connection.