During brazing, what should be avoided to prevent issues in the system?

The formation of scale during brazing is a critical issue because scale can create an unwanted barrier between the filler metal and the base metals being joined. Scale is typically an oxide layer that forms on the surface of metals when they are heated, and it can significantly hinder the flow of the brazing material, which compromises the integrity of the joint.

When scale is present, the filler metal may not adhere properly, leading to weak joints that can fail under stress or pressure. To ensure a strong and reliable brazed joint, it is essential to maintain clean surfaces by removing any oxides or scale before the brazing process begins. This attention to surface preparation can drastically improve the quality of the brazed connection, which is crucial in maintaining the overall functionality and reliability of the assembly.

Using flux, managing humidity, and employing copper alloys are typical practices in brazing that can enhance the process and final product rather than hinder it. In fact, flux can help prevent oxidation during heating, humidity needs to be controlled to avoid moisture-related issues, and copper alloys are frequently used as filler materials for their excellent properties in brazing applications. Thus, focusing on the prevention of scale formation is paramount for successful brazing outcomes.