Brazing Q&A

Q: We are currently finding internal voids when assessing cross sections of vacuum-brazed aluminum parts. What are some causes and solutions that would mitigate this?  

A: Companies and individuals who braze regularly commonly encounter voids in brazed joints and often wonder what causes them and how to prevent them in future brazements.

Some common sources of voids in brazed joints can include the following (Ref. 1):

1. Surface contamination