Aluminum alloys are one of the most common types of materials used in any type of manufacturing and fabrication process. Aluminum can be found in aerospace, military and defense, automotive, heavy equipment, industrial processing systems and even in medical devices and implants.
While aluminum is a popular choice due to high strength to weight ratio, excellent corrosion resistance, and machinability, not all alloys are easy to work with. In addition, brazing aluminum, which is a popular option when joint strength is critical, can really be a challenge for inexperienced shops and heat treatment services.
Working with an experienced heat treatment company with a long history in brazing aluminum is the first important step. This is true if you are using aluminum as both sides of the joint or if you are brazing to another metal.
Low Melting Temperature
Aluminum alloys tend to have low melting temperatures, which needs to be carefully considered when brazing aluminum to another metal with a higher melting temperature. In most cases, the brazing process will be reserved for aluminum alloys in the 3000 series, but there are some in the 6000 that are also good candidates for this process.
The low melting point means that the entire process has to be precisely controlled. Automated systems that allow for continuous monitoring, feedback and adjustment are often the best option and also provide lower cost production than completing the process manually.
Brazing Fillers and Flux Options
The choice of fillers when brazing aluminum is always an important factor. This will need to be carefully considered to ensure the filler has a melting point below the aluminum component. In addition, and to prevent discoloration of the joint area, it will also be essential to use flux or to choose a process for brazing, such as a vacuum brazing process, to limit the development of oxides.
