The best braze for aluminum is a brazing alloy based on the Al-Si system with a silicon content generally ranging from 7% to 12%. These brazing alloys are excellent in terms of brazeability, strength, and color consistency of the base material. The most common composition is the Al-Si system with a silicon content of 11.7%, which 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.
In addition to silicon, other elements like magnesium can be added to the brazing alloy to create new formulations. Magnesium helps reduce the reformation of the oxide layer on the aluminum surface, allowing for better wetting of the metal to be brazed and improving the flow of the brazing material.
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.
Overall, the Al-Si brazing alloy is the preferred choice for aluminum brazing due to its brazeability, strength, color consistency, and corrosion resistance. It allows for the assembly of aluminum components with a soldering alloy that has a lower melting point than the base material, creating strong and durable brazed joints.
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. Explore our range and experience superior brazeability with KINTEK!
