The temperature of a brazing oven can vary depending on the materials being brazed and the specific application. Generally, brazing takes place at higher temperatures compared to soldering. In a reducing atmosphere furnace brazing, where copper or copper-base alloys are used as filler materials, the brazing temperature is typically in excess of 1085°C (1985°F).
For vacuum brazing, especially when stainless steels are involved, high-temperature brazing filler metals are employed. Vacuum brazing temperatures are usually above 1000°C (1832°F). This temperature range allows for some heat treatments as part of the brazing process.
Proper cleaning of the parts before brazing is essential, as well as careful control of hydrogen, oxygen, and water vapor levels in the furnace. The ramp rate of the temperature during the brazing cycle is also critical to avoid distortion and ensure proper braze flow.
In the case of brazing high-temperature nickel alloys, the brazing temperature is typically between 1040-1200°C (1900-2200°F) in a vacuum level of 10-4 to 10-5 mbar (10-4 to 10-5 Torr). After brazing, the work is allowed to slow cool to approximately 980°C (1800°F) for solidification of the filler metal.
When brazing with hydrogen, the atmosphere within the furnace should be slightly positive, and the optimal temperature for copper brazing is usually between 1100 and 1500°F.
It is important to note that the specific temperature and time requirements for brazing may vary depending on the materials, joint design, and desired properties of the finished product.
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