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Positive Contact Thermal Isolation Weld/ Braze Fixture

IP.com Disclosure Number: IPCOM000049117D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Phelps, DW: AUTHOR [+3]

Abstract

In welding pins to substrates for electronic components it is necessary to insure good welds at all pin locations. The present device and technique insure good electrical contact, and thermal isolation of the pins and welding pads during the welding operation.

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Positive Contact Thermal Isolation Weld/ Braze Fixture

In welding pins to substrates for electronic components it is necessary to insure good welds at all pin locations. The present device and technique insure good electrical contact, and thermal isolation of the pins and welding pads during the welding operation.

Typically, a copper alloy pin is welded (sometimes referred to as a weld/braze) to a copper alloy pad. The figure is a sectional view of a portion of a substrate with the present fixture in place to perform the weld/braze operation. The ceramic base has metal vias, typically W or Mo, which terminate at alloy pads, preferably Ag/Cu alloy, on the surface of the ceramic. A fixture, which is manufactured of an acceptable electrical conducting copper alloy such as Be/Cu, is, formed such that it has openings which are arranged to surround the weld pads, with the edges of the openings contacting the weld pads, as shown in the figure. Pins, one of which is shown, are welded to the pads with the fixture in place. The fixture, which is placed over the pads prior to welding, provides a good positive electrical contact to each pad, which is necessary during welding. Also, the mass of the fixture removes heat from the welds as they are being made. After the welds are made, the fixture is removed.

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