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Brazing Flux vs Soldering Flux – What’s the Difference

Brazing Flux Vs Soldering Flux

Have you ever heard of brazing flux or soldering flux but weren’t sure what it is or how it works? In this article, we’ll discuss the differences between brazing and soldering flux and when each should be used.

What Is Soldering Flux?

Soldering flux is a substance that helps to create a stronger solder bond between two surfaces. The main role of flux is to remove any oxidation that may have occurred on the surface of the metals being joined, which will then help the solder flow more easily. It also helps to prevent further oxidation during the soldering process. Solder flux comes in many forms, including liquid, paste, cream, powder, and aerosol spray.

What Is Brazing Flux?

Brazing flux is a similar substance to soldering flux but with one key difference – it creates an even stronger bond than solder. This means it can be used for joining metals that require higher temperatures than those used for soldering. Brazing flux also removes any oxidation from the joined metal surfaces, allowing for better heat transfer during brazing. Unlike solder fluxes, however, there are fewer types of brazing flux available since they tend to be more specialized in their applications. Generally speaking, brazing fluxes come in either powder or paste form.

Difference Between Brazing Flux and Soldering Flux

  • Brazing flux is used to join metals together at high temperatures while soldering flux is used to join metals together at lower temperatures.
  • Brazing flux is typically made from borax while soldering flux is typically made from rosin.
  • Brazing flux helps to prevent oxidation of the metals being joined while soldering flux helps to prevent the formation of oxides on the surface of the metals being joined.
  • Brazing flux can be used on a variety of different metals while soldering flux is typically only used on copper and brass.
  • Brazing flux produces a stronger joint than soldering flux, but it can also be more difficult to remove from the metals being joined.


In summary, both soldering and brazing flux are essential materials for creating strong bonds between two metal surfaces. While both products do a similar job of removing oxidation and helping with heat transfer during bonding processes, they have some key differences, such as temperature range and application method. Therefore, understanding which product to use when is important so you can ensure that you get the best possible results from your project!

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