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Design of a braze joint that aviods the braze alloy from dripping

IP.com Disclosure Number: IPCOM000015716D
Original Publication Date: 2002-May-21
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Abstract

The invention deals with the furnace brazing of a stack of fins using spacers clad with braze alloy as shown in the following figure. In a typical furnace brazing operation, the fins and the spacers are stacked together and held together using a spring loaded fixture. When the assembly is heated to above the melting range of the braze alloy, the brazing alloy melts and wets the two faying surfaces. But the spring load squeezes the molten braze alloy out of the joint. The braze alloy drips down the fin walls.

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Design of a braze joint that aviods the braze alloy from dripping

      The invention deals with the furnace brazing of a stack of fins using spacers clad with braze alloy as shown in the following figure. In a typical furnace brazing operation, the fins and the spacers are stacked together and held together using a spring loaded fixture. When the assembly is heated to above the melting range of the braze alloy, the brazing alloy melts and wets the two faying surfaces. But the spring load squeezes the molten braze alloy out of the joint. The braze alloy drips down the fin walls.

      The proposed invention solves the problem of the braze alloy dripping down the fin walls as shown in the figure below.

Braze alloy

SpacerFin Fin

Braze alloy

Spacer

Fin

Fin

The proposed invention solves the problem of the braze alloy dripping down the fin walls by cutting bevels at one end of the spacers. The bevel creates a crevice in which the squeezed braze alloy can reside. Surface tension will keep the braze alloy from dripping down the fin walls as shown in the figure below.

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Braze alloy

SpacerFin Fin

Braze alloy

Spacer

Fin

Fin

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