The maximum service temperature for brazed joints is 600°C (1112°F).
This temperature is based on industrial applications involving the brazing of 28 exchangers.
These assemblies underwent rigorous testing, including unit leak tests and metallographic studies.
The brazed joints were found to be impermeable and structurally sound.
There were no signs of intergranular oxidation or excessive melting.
5 Key Insights
1. Importance of Brazing Temperature Range
Maintaining the brazing temperature within a specific range is crucial.
The temperature should be as low as possible but at least 25°C (50°F) above the liquidus temperature of the braze alloy.
This ensures proper flow of the braze alloy and its reaction with the base metal.
2. Time at Brazing Temperature
The time spent at the brazing temperature typically ranges from 5 to 10 minutes.
This ensures that all parts reach the desired temperature.
3. Cooling Cycle After Brazing
After the brazing process, the cooling cycle is initiated.
It is recommended to cool the load to at least 25°C (50°F) below the solidus temperature of the braze alloy before initiating gas quenching.
This prevents the molten braze alloy from being dislodged from the joint during the quench.
4. Brazing Process Temperatures
The brazing process involves temperatures typically over 840°F (450°C).
It uses stronger filler materials to create joints with higher strength compared to soldering.
5. Dew Point and Joint Integrity
The dew point during these processes must not fall below -60°C.
Proper design and preparation of the brazed joint are critical for achieving strength that can exceed that of the base material.
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