The brazing process involves heating materials to a specific temperature range to create strong and durable joints.
What is the temperature range of the brazing process? (500°C to 1200°C)
1. Lower Temperature Limit (500°C)
The lower temperature limit for brazing is 500°C.
This is the minimum temperature needed to melt the filler metal.
At this temperature, the filler metal can flow and wet the base metals effectively.
If the temperature is too low, the filler metal may not flow properly, resulting in weak joints.
2. Upper Temperature Limit (1200°C)
The upper temperature limit for brazing is 1200°C.
This limit prevents the base metals from experiencing excessive thermal stress or damage.
Exceeding this temperature can cause the base metals to melt or undergo structural changes.
The choice of this upper limit depends on the melting points of the base metals and the filler metal.
3. Process of Brazing
During the brazing process, the furnace temperature is gradually increased to the brazing temperature.
This ensures proper heat distribution and minimizes thermal stresses.
Once the brazing temperature is reached, it is maintained for a specified time.
This allows the filler metal to melt, flow, and wet the base metals, creating a strong joint.
After brazing, the furnace is slowly cooled to room temperature to further minimize thermal stress and distortion.
4. Factors Affecting Brazing Temperature
The exact brazing temperature within the range depends on several factors.
These include the melting points of the base metal and the braze alloy.
The joint design and the desired properties of the final product also play a role.
It is crucial that the melting range of the braze alloy does not overlap with that of the base metal.
The solidus of the base metal should be at least 55ºC (100ºF) higher than the liquidus of the braze alloy.
This ensures that the base metal remains solid while the filler metal is molten.
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