How many hours after cleaning surfaces for brazing should joints be brazed?

The recommended timeframe for brazing joints after cleaning surfaces is critical to ensure the integrity and strength of the brazed joints. The correct answer indicates that joints should be brazed within 8 hours after the cleaning process.

This timeframe is established to prevent oxidation and contamination from occurring on the cleaned surfaces. After cleaning, surfaces can quickly begin to oxidize, which could significantly impair the quality of the joint if brazing is delayed. By brazing within the 8-hour window, you minimize the risk of oxidation and ensure that the surfaces are suitably prepared for the brazing filler material to effectively bond.

The selection of a timeframe like 8 hours reflects industry standards, which help maintain the necessary conditions for effective brazing and ensure safety and reliability in medical gas systems.