Vacuum Aluminum Brazing 101
Vacuum aluminum brazing is a specialized process used to join aluminum components. Unlike traditional torch brazing or dip brazing, vacuum brazing takes place in a clean, controlled environment without the use of flux. Let’s dive into the details:Get more news about
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Key Aspects of Vacuum Aluminum Brazing:
Components and Materials:
The most common types of aluminum used for vacuum brazing are Al-6061, Al-1100, and 3000 series Al.
Components must be properly prepared for excellent capillary action (wetting). Milled or turned surfaces with a 32 to 64 micro-inch surface finish work best.
Surface Preparation:
The mating surfaces to be brazed must be flat and less than 0.003 inches thick.
Jitterbugging with aluminum-oxide paper is not recommended; silicon carbide is preferred.
Avoid using lapping compounds on surfaces to be brazed.
Excess Material for Final Machining:
Components should have at least 0.050 inches of excess material to be final machined after brazing.
The brazed assembly will be annealed and heat-treated to a T6 before final machining.
Oxide Removal:
Aluminum forms an oxide layer in the air at room temperature.
To achieve a high-quality braze joint, this oxide layer must be completely removed to allow bonding to the native metal surfaces.
If you’re consigning aluminum components to a brazing service, ensure they are chemically etched and vacuum-sealed or sealed in a suitable plastic bag with an inert gas prior to shipment.
Temperature Measurement:
Place a 0.075-inch diameter thermocouple hole on one of the outer vertical surfaces to accurately measure the assembly’s temperature during brazing.
Full Turnkey Solutions:
Consider inquiring about full turnkey solutions that handle the entire brazing process from design to testing, reducing overall risk.
