Class 5 Boiler Practice Exam 2025 – The Comprehensive All-in-One Guide to Exam Success!

Brazing is a metal-joining process that involves melting a filler metal to create a bond between two or more metal surfaces. The key factor in brazing is the melting point of the filler metal, which typically ranges above the melting point of the base metals being joined. The process is often performed at temperatures significantly above 600°F, which distinguishes it from soldering, where the melting point is lower.

The correct choice indicates that the melting point of brazing filler metals is greater than 840°F. This aligns with many common brazing alloys, which typically include materials like brass, bronze, and other alloys that require elevated temperatures to achieve a proper fusion without melting the base metals.

In contrast, options that suggest lower melting points would not accurately represent the nature of brazing, as these temperatures are more characteristic of soldering rather than brazing. Thus, recognizing the required higher temperatures for effective brazing is critical for proper understanding and application in metalworking practices.