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Butt Brazing Apparatus and Method

IP.com Disclosure Number: IPCOM000078891D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Bank, RH: AUTHOR [+3]

Abstract

This is a metallic bonding system, in which the miniature wires are butt-brazed to a pad member to form electrical connections. Fig. 1 shows a wire 20 which has a core 10 of brazing material such as copper, silver and phosphorus. Core 10 is plated with copper 12 for high thermal and electrical conductivity and can be enclosed in a film of insulation 14. Fig. 2 shows the tweezer-like holding and heating element at the finish of the operating cycle when the braze is complete.

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Butt Brazing Apparatus and Method

This is a metallic bonding system, in which the miniature wires are butt-brazed to a pad member to form electrical connections. Fig. 1 shows a wire 20 which has a core 10 of brazing material such as copper, silver and phosphorus. Core 10 is plated with copper 12 for high thermal and electrical conductivity and can be enclosed in a film of insulation 14. Fig. 2 shows the tweezer-like holding and heating element at the finish of the operating cycle when the braze is complete.

When wire 20 is positioned within the brazing apparatus and located for brazing against clad element 28, a controlled current pulse 1 is applied by closing of switch 32 in supply 30, which provides a path for discharge of condensor 34 through primary of transformer 36. The current passes along a first conductive element 22 and forms a first electrode and a second conductive member 24 forms a second electrode.

Each of these electrodes contains a wire holding section 26 for holding small composite wire 20 near one end thereof. High-resistance member 38 is connected across the other end thereof, and power supply 30 is connected at one end of each of the first and second conductive elements 22, 24.

Current pulse 1 is of sufficient duration to cause heating in wire holding section 26 to melt the insulation and contact composite wire 20, thereby completing a circuit through the wire, which heats up sufficiently to cause brazing material section 10 of wire 20 to form...