What is the maintenance requirement for the repair of brazed joints?

The maintenance requirement for the repair of brazed joints dictates that these joints must be heated only once during the repair process. This is crucial because brazing involves melting a filler metal that flows into the joint by capillary action at high temperatures. If a brazed joint is reheated multiple times, it can lead to degradation of the joint integrity, affecting its strength and durability.

The brazing process establishes a metallurgical bond that, once set, maintains its properties under normal operating conditions. Repeated heating can potentially weaken the joint due to changes in microstructure or alteration of the base metals' characteristics. Therefore, following the guideline of heating only once ensures that the repaired connection retains its original qualities, providing safety and reliability in medical gas pipeline systems.