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Aluminum brazing flux is a chemical compound that is applied to the surface of aluminum prior to brazing. The primary function of aluminum brazing flux is to remove any oxide layers that may be present on the surface of the aluminum. These oxide layers can prevent the filler metal from bonding properly with the aluminum, leading to weak joints.
Aluminum brazing flux is typically a mixture of chlorides and fluorides of alkali and alkaline earth metals. These chemicals react with the oxide layer on the aluminum surface to form a soluble salt that can be washed away. The flux also helps to prevent the formation of new oxide layers during the brazing process.
There are two main types of aluminum brazing flux: corrosive and non-corrosive. Corrosive flux is water-soluble and can be washed away after brazing. Non-corrosive flux is not water-soluble and must be removed with a solvent.
The type of flux that is used will depend on the application. Corrosive flux is typically used for brazing applications where the joint will not be exposed to water or other corrosive environments. Non-corrosive flux is typically used for brazing applications where the joint will be exposed to water or other corrosive environments.
Here are some of the benefits of using aluminum brazing flux:
- It removes oxide layers from the surface of the aluminum, allowing the filler metal to bond properly.
- It prevents the formation of new oxide layers during the brazing process.
- It helps to promote wetting of the filler metal by the aluminum.
- It helps to prevent porosity in the brazed joint.
- It makes the brazing process easier and more consistent.
Here are some of the things to keep in mind when using aluminum brazing flux:
- The flux must be applied evenly to the surface of the aluminum.
- The flux must be dry before the brazing process begins.
- The flux must be removed from the joint after brazing.
- The flux can be harmful to the environment, so it is important to dispose of it properly.
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