Types of Brazing and the Benefits it Brings to Industry Applications

Types of Brazing and the Benefits it Brings to Industry Applications

Aluminum brazing includes many different techniques for producing the bond and can be performed with or without flux. Flux comes in a number of different forms, such as liquid, paste or powder. Flux brazing processes comprise induction, torch brazing (automatic and manual), salt bath, and controlled atmosphere brazing (CAB). Some brazing rods have a flux core or are coated with flux so as to apply the required flux during the brazing process.
When brazing is carried out in a vacuum furnace, it is deemed fluxless brazing as it does not use flux to produce the joint. Such processes include ceramic to copper brazing, semi-conductor manufacturing, etc. Thanks to the cleanliness of the vacuum environment, flux is not required; however, magnesium is utilized as an additive in the vacuum aluminum brazing process.
Benefits of Vacuum Aluminum Brazing
When compared to other metal-joining processes, brazing offers a number of benefits. Since brazing does not melt the joint’s base metal, it provides more accurate control of tolerances and offers a clean joint without the need for further finishing. The filler metal forms the meniscus in the brazed joint, which is suitably shaped to reduce stress concentrations and enhance fatigue properties.
Vacuum aluminum brazing reduces distortion of parts and produces a continuous hermetically sealed bond, thanks to uniform heating and cooling. Components with numerous joints and large surface areas can be effectively brazed. In addition, hardening can be carried out in the same furnace cycle if a forced cooling system is incorporated into the furnace system and hardenable alloys are utilized. This can considerably reduce the cycle time.
Applications of Vacuum Aluminum Brazing
Some of the ideal situations for vacuum aluminum brazing include parts of very thick or thin cross sections that need joining; dissimilar metals such as stainless steel and copper that need joining; compact components comprising many junctions to be sealed; and assemblies having a large number of joints.
Vacuum brazing is suitable for oxidation sensitive materials. It is considered a flux-free process that prevents corrosive flux residue. It is also non-polluting and eliminates post-braze cleaning procedure; post-brazed parts are clean and have a matte grey finish.
Edited by simuwu
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