The temperature of brazing alloys varies depending on the specific alloy and the materials being joined. Generally, the brazing temperature should be at least 25ºC (50ºF) above the liquidus temperature of the braze alloy to ensure proper flow and reaction with the base metal. The time at brazing temperature typically ranges between 5 and 10 minutes, depending on the load size and complexity.
For aluminum alloys, the brazing temperature is typically between 575-590°C (1070-1100°F), with strict temperature uniformity requirements. In the case of copper alloys, the brazing temperature is usually between 1100–1120°C (2000–2050°F). It is crucial to maintain the appropriate vacuum levels and use inert gases to prevent contamination and evaporation during the brazing process.
When selecting a braze alloy, it is important to consider the melting points of both the base metal and the braze alloy. The solidus temperature of the base metal should be at least 55ºC (100ºF) higher than the liquidus temperature of the braze alloy to avoid overlapping melting ranges. This ensures a successful brazing process and a strong joint.
In summary, the temperature of brazing alloys depends on the specific alloy and materials being joined, with a general guideline of being at least 25ºC (50ºF) above the liquidus temperature of the braze alloy. Proper temperature control, vacuum levels, and inert gas usage are essential for successful brazing.
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