Vacuum brazed assemblies can be found in a wide array of markets and applications. These assemblies can range from oil coolers for automotive applications to highly complex environmental control systems with reduced weights for the aerospace and defense industries. The vacuum brazing process is especially ideal for products where high quality joints, lightweight assemblies, and high thermal and mechanical performances are required.
Compared to other metallurgical techniques for joining aluminum, vacuum furnace brazing offers numerous technical advantages:
- High-strength, void-free, leak-free joints similar to parent materials
- Proof pressures can reach up to 800 psi and burst pressures up to 1300 psi
- Ability to fill long, otherwise inaccessible joints
- Option for internal joints, even in complex structures, increasing the part’s overall strength
Excellent Thermal Properties:
- Uniform thermal conductivity from using similar parent and braze material properties
- Temperature resistance up to 350°F (176°C)
- Enables highly enhanced surface structures to enhance thermal transfer
Consistent & Clean Results:
- Minimal distortion due to uniform heating and cooling, ideal for complex geometries
- Consistently reproducible results with tightly toleranced joining surfaces
- Extremely clean parts with no residual corrosive flux due to the flux-free process (unlike dip brazing)
- No surface deterioration during processing
Single process production of complex assemblies with multiple joints can lower cost while increasing product quality. Yields of 80% are typical for the vacuum brazing process, but 98% or better yields are possible in a carefully controlled process. With high yields for complex fabrications, vacuum brazing is the preferred joining process for manufacturing high performance aluminum cold plates and heat exchangers.