Vacuum Brazing

Vacuum brazing is a method of joining components which involves heating a braze alloy between the assembly components. The melting temperature of braze alloys is lower than that of the parent component material.

Prior to brazing the braze alloy is applied between tight fitting parent alloy components that are fixtured into place. Assemblies are heated in a vacuum furnace to at least 650°C, which melts the braze alloy but not the main material. The vacuum environment of the furnace eliminates the risk of oxidation and the need for flux. 

The molten braze alloy fills gaps between components through capillary action, and when cooled, it forms a joint via atomic attraction and diffusion. Vacuum brazing results in a clean, onepiece construction with strong joints and nearly the same thermal conductivity as the parent material.

Vacuum brazing is an ideal process for thermal and structural assemblies due to its uniform heating, tight temperature control, absence of post-cleaning processes, and process repeatability. Vacuum brazing is commonly used on aluminium cold plates, plate-fin heat exchangers, and flat tube heat exchangers.

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Brazing Services