HVAC Journeyman Practice Exam 2026 - Free HVAC Practice Questions and Study Guide

The term for a joint formed by joining metal parts with alloys that melt at temperatures above 840°F is indeed "brazed." Brazing is a metal-joining process that involves melting a filler metal that has a melting point above 840°F but below the melting point of the base metals being joined. This process allows for a strong joint while maintaining the integrity of the base metals.

In contrast, "fused" refers to a method where materials are joined by melting them together without the specific inclusion of a filler material, which doesn't apply here. "Soldered" involves a filler metal with a lower melting point, typically below 840°F, suitable primarily for electronics or plumbing applications where lower temperatures are sufficient. "Welded" refers to a process where the base metals are melted together at their own melting points, which can vary significantly and often requires very high temperatures, but it is distinct from brazing because it doesn’t utilize a filler metal in the same way.

Thus, understanding the definition and the temperature requirements of brazing clarifies why it is the correct term for this type of metal joint.