Joints shall be brazed within how many hours after surfaces are cleaned for brazing?

For brazing joints, it is imperative to join the cleaned surfaces as soon as possible to ensure a strong metallurgical bond. Cleaning is crucial because any contaminants such as oil, dirt, or oxidation can interfere with the brazing process and lead to weak joints or failure. The specified time frame of up to 8 hours after surfaces have been cleaned is recommended because it allows a reasonable window for making the necessary connections without risking contamination.

If brazing is not completed within this time frame, the surfaces may become contaminated or oxidized, resulting in an inadequate bond and potentially compromising the integrity of the joint when subjected to pressure or thermal cycling. Therefore, adhering to this guideline is essential for achieving reliable and safe brazed joints in the installation of medical gas systems.