Knowledge Base

Topics related to brazing to aid with learning and understanding the technical aspects of brazing, how brazing works, why it works, along with useful hints and tips.

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Brazing Fundamentals

Brazing is a process that uses a Braze Filler Metal (BFM) with a melting temperature above 840°F (450°C) but below the melting point of the metals to be joined. In brazing, the base metals are heated, usually to a point slightly above the liquidus (flow point) of the filler metal, causing it to melt. The filler metal then flows into the parallel joint clearance between the two base materials by capillary attraction and bonds to their surfaces through atomic attraction and diffusion.

To braze effectively braze, one must clearly understand brazing fundamentals. Most of the problems associated with brazing stem from one or more violations of the brazing fundamentals.

These fundamentals include the following:

  • Good fit and proper clearance
  • Clean base metals
  • Proper fixturing
  • Proper fluxing/atmosphere
  • Heating the assembly
  • Cleaning the brazed assembly