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Butt Brazing Process for Headed Pins

IP.com Disclosure Number: IPCOM000090740D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Crawford, DW: AUTHOR [+2]

Abstract

The butt brazing of headed pins to respective metallized pads on alumina substrates is facilitated by the use of a pin aligning fixture. This permits the seating of the pins individually despite nonplanarity of the substrate. In drawing A, headed pin 1 is inserted into a respective countersunk hole in pin-holding fixture 2. Disk 3 or sphere of brazing material is placed on top of the head of pin 1. Substrate 4 has metallized pad 5 with an area greater than that of the head of pin 1. A similar metallized pad is provided on substrate 4 for each of the additional headed pins held by fixture 2. In a typical case, a graphite or ceramic fixture 2 is loaded with a plurality of headed pins 1 and a corresponding number of silver-copper brazing alloy disks 3.

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Butt Brazing Process for Headed Pins

The butt brazing of headed pins to respective metallized pads on alumina substrates is facilitated by the use of a pin aligning fixture. This permits the seating of the pins individually despite nonplanarity of the substrate. In drawing A, headed pin 1 is inserted into a respective countersunk hole in pin-holding fixture 2.

Disk 3 or sphere of brazing material is placed on top of the head of pin 1. Substrate 4 has metallized pad 5 with an area greater than that of the head of pin 1. A similar metallized pad is provided on substrate 4 for each of the additional headed pins held by fixture 2.

In a typical case, a graphite or ceramic fixture 2 is loaded with a plurality of headed pins 1 and a corresponding number of silver-copper brazing alloy disks 3. Substrate 4, having a corresponding plurality of molybdenum manganese pads, is brought into facing contact with the loaded fixture and the entire unit is placed on the feed belt of a brazing furnace. Substrate 4 is placed against the furnace belt with pins 1 extending upward. Each pin is free to move axially under the force of gravity to seat itself against substrate 4 during the brazing operation. The finished device is shown in drawing B after removal of fixture 2.

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