Controlled atmosphere brazing (CAB) is a specialized metal-joining process.
In this process, a filler metal, often silver, is heated above its melting point.
The heated filler metal is then distributed between two closely fitting metal parts through capillary action.
As the filler metal cools, it forms a strong, leak-free bond, completing the assembly.
5 Key Points Explained
1. Cleaning and Pre-Assembly
Before brazing, components are cleaned and/or degreased to remove any contaminants.
They may also undergo pre-assembly through methods like press fit or TIG welding.
2. Application of Filler Material
A paste or ring of filler material is applied to the joint area.
3. Heating and Brazing
The parts are then placed on a conveyor belt that moves through a furnace.
The furnace is filled with an oxygen-free atmosphere, typically nitrogen or hydrogen.
This prevents oxidation and ensures the filler material melts and flows properly into the joint.
4. Cooling
After the brazing process, the parts are cooled, solidifying the filler metal and completing the bond.
5. Advantages and Challenges
Advantages
Enhanced Quality: CAB prevents localized overheating and metal damage, ensuring the filler material melts and flows correctly into the joint without the need for flux.
Improved Appearance: In some cases, metal parts emerge from the furnace with a brighter finish than before brazing.
Scalability: This process is suitable for mid to high volume production, making it efficient for large-scale manufacturing.
Challenges
Material Selection: Choosing the correct filler material is crucial, depending on the required bonding strength or conductivity.
Process Control: Accurate calculation of time at temperature is essential to prevent overheating or underheating, which can affect the quality of the bond.
Atmosphere Management: Maintaining an oxygen-free environment is critical to prevent oxidation during the brazing process. This requires specialized knowledge of atmosphere furnaces and the safe handling of industrial gases.
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