When it comes to brazing aluminum, choosing the right brazing alloy is crucial.
The best braze for aluminum is a brazing alloy based on the Al-Si system.
These alloys typically have a silicon content ranging from 7% to 12%.
This range ensures excellent brazeability, strength, and color consistency of the base material.
5 key points to consider
1. Composition of the Brazing Alloy
The most common composition is the Al-Si system with a silicon content of 11.7%.
This is a eutectic system with a eutectic temperature of 577°C.
This composition is widely used in production and is suitable for brazing a variety of aluminum alloys with relatively high melting points.
2. Addition of Other Elements
In addition to silicon, other elements like magnesium can be added to the brazing alloy.
Magnesium helps reduce the reformation of the oxide layer on the aluminum surface.
This allows for better wetting of the metal to be brazed and improves the flow of the brazing material.
3. Vacuum Level and Temperature Control
When brazing aluminum, it is important to maintain a vacuum level of 10-5 mbar (10-5 Torr) or better.
Parts are heated to temperatures ranging from 575-590°C (1070-1100°F), depending on the alloy being brazed.
Temperature uniformity is critical, with a tolerance of ±5.5°C (±10°F) or better.
Longer brazing cycles may be required for larger parts or dense loads.
4. Benefits of Al-Si Brazing Alloy
The Al-Si brazing alloy is the preferred choice for aluminum brazing.
It offers excellent brazeability, strength, color consistency, and corrosion resistance.
This alloy allows for the assembly of aluminum components with a soldering alloy that has a lower melting point than the base material.
This creates strong and durable brazed joints.
5. Why Choose KINTEK?
Looking for the best braze for aluminum? Look no further than KINTEK!
Our brazing alloys based on the Al-Si system with a silicon content ranging from 7% to 12% offer excellent strength, color consistency, and corrosion resistance.
With a standard composition of 11.7% w(si) and a eutectic temperature of 577°C, they are perfect for brazing aluminum alloys with high melting points.
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Explore our range of brazing alloys and consult our experts today!
Contact us now to learn more about how KINTEK can meet your brazing needs.
