At what temperature does copper tubing glow with a red/brass color?

When heating copper tubing, it begins to glow at high temperatures, which is a key characteristic of metals as they are heated. The glowing color changes with temperature; at around 1800°F, copper will emit a red/brass color. This phenomenon occurs due to the emission of light as the metal transitions from a solid state to a brightly glowing liquid state.

Understanding this property is important for technicians working with HVAC systems, as temperature management during processes such as welding, brazing, or soldering is critical. At temperatures around 1800°F, the copper has reached a level where it not only becomes pliable for forming joints but also shows visible coloration that indicates its heat content and readiness for certain applications. This knowledge helps ensure proper handling and processing of copper in residential air conditioning and other applications.