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Removal of Excess Foil Material of Metal Foil Disks

IP.com Disclosure Number: IPCOM000052260D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Larson, WB: AUTHOR [+2]

Abstract

A common approach for attaching metal foil to a ring for producing disks or manufacturing membranes for various application is to cut out the desired shape of the foil before or after the assembly. The foil surface is thus exposed to mechanical damage and contamination.

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Removal of Excess Foil Material of Metal Foil Disks

A common approach for attaching metal foil to a ring for producing disks or manufacturing membranes for various application is to cut out the desired shape of the foil before or after the assembly. The foil surface is thus exposed to mechanical damage and contamination.

ln order to overcome these exposures and to simplify the process, the following process may be used to eliminate the cutting of the foil. The foil is attached onto the ring by a continuous weld.

The foil material outside the ring (excess) is then peeled off with a shearing or bending action rather than a plane pulling one. The foil inside the ring stays firmly attached to the weld, and no distortion of the weld is produced due to the peeling action.

The foil for this approach has to have the following characteristics: high strength, but reduced strength in the immediate vicinity of the weld. The heat generated at the welding site should generate that change. Good materials are 300 series stainless steel and INCONEL*.

The welding technique should be fast to produce a small area of reduced strength. A fast process generates a high heating rate and a high temperature gradient around the weld during the process. Laser welding with a YAG or CO(2) laser will fulfill this requirement. An area of reduced strength which is small ensures negligible burrs due to peeling. * Trademark of the International Nickel, Co., Inc.

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