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Vacuum Aluminum Brazing Basics

Over the past 25 years, Vacuum Aluminum Brazing (VAB) has gained wide acceptance in the aerospace, automotive, and electronics industries.  Unlike traditional Dip Brazing or Controlled Atmosphere Brazing (CAB), VAB does not use a liquid salt flux that can become entrapped during the process, the presence of which can lead to part corrosion and failure.

Some of the Critical Factors in Vacuum Aluminum Brazing include:

Part / Braze Joint Design – no vertical joints, no non-vented cavities, sufficient braze “land”.
Part Cleanliness – minimal surface oxides.
Atmosphere Cleanliness – deep vacuum during processing (10-6 Torr range).
Furnace Control – precise temperature control and uniformity (+/- 5°F per AMS 2750E).

Typical applications that utilize Vacuum Aluminum Brazing include cold plates, heat exchangers, and manifolds.  The most common grade of aluminum used for VAB is 6061, which is also heat treatable after brazing.

Brazing Joints can be classified as Class A (most critical) to Class C (least critical).  Joint integrity can be tested by many destructive and non-destructive methods.  See AWS C3.7 Specification for Aluminum Brazing for more details.

Turnkey Brazed Assemblies vs. Brazing Services
Over the years, California Brazing has morphed from a provider of brazing services, to a supplier of turnkey brazed assemblies.  Today, the vast majority of our orders are for complete brazed assemblies built to our customer’s print.

For more information on Vacuum Aluminum Brazing, or furnace brazing in general, please contact California Brazing at 510-790-2300 or