What must be done to the joint area after it has cooled?

After brazing, it is crucial to clean the joint area to remove any oxides, flux residues, or contaminants that may have accumulated during the process. This cleaning step ensures that the joint maintains its integrity and prevents corrosion or weakening of the bond over time. Proper cleaning allows for effective visual inspection and ensures the joint is ready for any subsequent processes, such as painting or application of additional protective coatings. By prioritizing cleanliness, the longevity and reliability of the brazed joint can be significantly enhanced, making it an essential step following the cooling of the joint.