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Understanding the Different Types of Flux

Mathure Metal Works

Did you know that there are several different types of fluxes that can be used in brazing. The selection of the appropriate flux depends on the specific materials being joined, the brazing process used, and the application for which the joint will be used. For all brazing technicians, it is important to know that selecting the right flux can be the crucial difference between a leak-proof joint and a leaky joint.



So, let us start by first understanding the different types of fluxes. Here are some common types of fluxes used in brazing:

  1. Boron-based flux: This is one of the most commonly used fluxes for brazing copper and brass. Fluxes that have Boron derivatives helps the joints by forming a protective layer over the joint and preventing the formation of oxides.


  2. Aluminum-based flux: This type of flux is used for brazing aluminum and aluminum alloys. Aluminum oxide is a stubborn oxide that is difficult to remove, and this type of flux typically contains fluoride compounds that help to remove the aluminum oxide layer that forms on the surface of the metal.


  3. Silver-based flux: This type of flux is used for brazing silver and other precious metals. These are usually strong fluxes that are designed to help remove surface oxides and prevent the formation of new ones.


  4. Phosphor-based flux: This type of flux is used for brazing copper and copper alloys, and it can also be used for brazing brass and bronze as well. These fluxes are designed to dissolve the oxides on the surface of the metal and to reduce the surface tension of the filler metal.


  5. Flux-coated rods or wires: The latest innovation in the brazing flux industry, this type of flux is applied directly to the filler metal, rather than the base metal. It is commonly used in brazing applications that require a small amount of filler metal, such as jewelry making or electronics.


It is important to select the right type of flux for your brazing application in order to achieve strong, reliable joints. The selection of the appropriate flux depends on the materials being joined, the brazing process used, and the application for which the joint will be used.


We, at Mathure Metal Works, have built a team of experts to help guide you through your brazing journey. From establishing the correct procedure to selecting the right materials, we can help you perfect brazing through and through.

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