Brazing

Brazing is a process that uses filler material to join two workpieces together. The main difference between brazing and other welding processes is that the filler material has a lower melting point than the materials being joined together. It is therefore the filler material that is melted to form the joint between the two workpieces, as opposed to the workpieces themselves. In this way, brazing is extremely similar to soldering, although it provides a much stronger bond between the materials.

A torch is used to heat the filler material to its melting point, where it flows in between the two workpieces, before cooling and becoming a solidified joint. A range of filler materials can be used within the brazing process, including aluminium, copper alloys, silver and nickel alloy. As the base material remains solid during brazing, it is a great option for fusing two different material grades together.

The resulting joint is very robust; however, due to the fact that the filler materials have a relatively low melting point, brazing is not suitable for joining components that will then be subjected to heat within their end application. Brazing is great for high precision work, as tight tolerances can be adhered to; however, it is generally only suitable for smaller-scale work - larger joints may require an alternative joining/welding process to be effective.

 

Used to produce

Smaller, precision joints between materials.

Materials

Brazing is great for joining two different base material grades together, owing to the fact that the state of the base materials remains unaffected during the brazing process. A range of filler materials can be used, including aluminium, copper alloys, silver and nickel alloy.

Advantages

Can join workpieces together consisting of different material grades.
Tight tolerances can be adhered to.
Results in a strong, robust joint between the base materials.

Disadvantages

Is not suitable for larger joints.
Cannot be used on components that will be subjected to heat within their end application, owing to the fact that the filler material has a relatively low melting point.

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