Under what conditions are brazed joints not typically utilized?

Brazed joints are typically not utilized when system operating temperatures exceed 250ºF because the materials used in brazing may not retain their strength and integrity at such elevated temperatures. Brazing involves the use of a filler metal that, when heated, flows into the joint. This filler metal can lose its mechanical properties and may not maintain a reliable bond if exposed to high temperatures. Therefore, for applications that involve operating conditions above this temperature threshold, alternative joining methods, such as welding or using other types of fittings that can withstand the heat, are preferred to ensure the safety and efficacy of the system.

In contrast, brazed joints can provide adequate strength and are suitable for low-pressure applications as well as when using cup-joint fittings, making them practical in many other scenarios. However, the limitation regarding high-temperature applications makes it essential to consider joint integrity under specific operating conditions.