3 Types Of Flux Used During Silver Brazing

Silver brazing is a process used to join metals using a non-ferrous filler metal. A flux material is required to successfully complete the brazing process, and there are several different types of flux materials available on the market today.

If you take the time to become familiar with these flux options, you will be able to select the flux material that is best suited to help you achieve the joining results you are looking for.

1. White Paste Flux

The most commonly used flux material is referred to as white paste flux. As the name suggests, this flux is a thick white paste that can be applied directly to the surface of the metals being joined using the silver brazing process.

White paste flux is extremely versatile, with the ability to perform on copper, brass, stainless steel, and multiple steel alloys. If you are looking for a versatile flux material that is cost-effective, white paste flux is likely your best option.

2. White Powder Flux

Another popular type of flux used in the industrial and manufacturing industries is white powder flux. This flux is essentially the same as white paste flux, but it comes in a powdered form.

The powder is much more stable than the paste. You can easily store white powder flux for an extended period of time without worrying about the powder hardening or separating.

To use white powder flux, heat your welding rod and dip it into the powder. The flux powder will adhere to the heated rod.

You also have the option of mixing white powder flux with alcohol or water to create a paste-like consistency. This paste can be applied directly to the parts you are joining using a silver brazing process.

3. Black Flux

If you are in need of a more specialized flux material, you may want to reach for a black flux. This powdered flux offers a number of unique benefits that can enhance the quality of your welds.

Powdered boron is added to basic flux materials to create black flux. It is the boron that gives this flux its ebony color.

The primary role of flux during the brazing process is to absorb oxides that are released from the base metals. The addition of boron raises the saturation point of the flux material, allowing for longer heating cycles and more efficient welding times.

Black flux can also be useful in dissolving tough oxides in tungsten, nickel, and stainless steel.

For more information about silver brazing products, contact a company like Alexy Metals.