Advantages and Disadvantages of Vacuum Brazing

Manfred Boretius, 16. June 2019
The modular design of components leads to simplified manufacturing processes and cost savings - but these are by far not all the advantages of vacuum brazing. 

Hard- and high-temperature vacuum brazing is a joining technology which can be used to produce firmly bonded connections and to join complicated geometries or rather several joints simultaneously. 

Vacuum brazing is characterized by its great universality and flexibility and has the following advantage:

  • An almost unlimited range of materials can be used (base materials and brazing alloys)

  • Minor distortions due to an even furnace heating

  • Very good joining quality due to the vacuum atmosphere

  • High strength, even at high operating temperatures

  • Avoidance of fluxes

  • High reproducibility due to excellent temperature uniformity and comfortable control of modern furnace systems, including the process documentation

  • Possibility of a combined heat treatment (brazing and hardening)

  • Large-scale components can be joined

  • No oxidation and annealing colour

  • Hardening and annealing can be integrated into the process

  • Low environmental impact


The disadvantages of vacuum brazing are:

  • Mostly batch processes with single batches. A continuous production is only possible with a very complex manufacturing facilities

  • Eventually high effort to fix components as components cannot be manipulated in the furnace

  • The whole component is heated, leading to a decrease of the hardness with already quenched and tempered materials or work-hardened materials

  • High investment costs



Topics: vacuum brazing