# US 4,396,819 A · Method of forming a conductive connection

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- Number: US 4,396,819 A
- Document ID: US4396819A
- Status: Granted
- Kind: A
- Application number: 06/298,321
- Filed: 1981-09-01
- Granted: 1983-08-02
- Earliest claimed: 1981-09-01
- Inventors: Vadim V. Muchkin; Georgy I. Kuzmichev; Emil V. Bumbieris
- Web page: https://patentgrep.com/patent/US4396819A

## CPC

- B23K 11/163: {Welding of coated materials}
- B23K 1/0004: {Resistance soldering}
- B23K 1/19: taking account of the properties of the materials to be soldered
- H01R 4/026: {comprising means for eliminating an insulative layer prior to soldering or welding}
- H05K 3/3421: {Leaded components}
- H05K 2201/10287: Metal wires as connectors or conductors
- H05K 2203/0195: Tool for a process not provided for in H05K3/00, e.g. tool for handling objects using suction, for deforming objects, for applying local pressure
- H05K 2203/1115: Resistance heating, e.g. by current through the PCB conductors or through a metallic mask
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10T 29/49144: by metal fusion
- Y10T 29/49179: by metal fusion bonding
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of forming a conductive connection between predominantly miniature members by pressing the members together and heating by means of electrodes through which three successive pulses of electric current are passed. First and second pulses act to break a flowable insulation coating of one of the members, melt a solder alloy in the location of the connection and effect a weld, while a third current pulse is applied to the electrodes prior to their raising from the members to thereby melt the solder alloy and flowable insulation coating, whereafter the electrodes are withdrawn from the members and the third current pulse is quenched.

## Claims

### Claim 1

A method of forming a conductive connection between predominantly miniature members, at least one of which is coated with a flowable insulation, comprising the steps of:
pressing said members together and heating them by means of electrodes;
introducing a solder alloy into the location of said connection between said members;
application to said electrodes first, second and third current pulses in succession;
passing through said electrodes said first current pulse to destroy said flowable insulation coating of one of said members in the location of said connection between said members;
passing through said electrodes and said members said second current pulse to effect a weld between said members;
application to said electrodes said third current pulse prior to raising said electrodes from said members;
heating said members to a temperature in excess of the melt points of said solder alloy and flowable insulation coating;
melting said solder alloy and said flowable insulation coating adjacent to the weld joint formed between said members;
cleaning said electrodes of said flowable insulation coating;
withdrawing said electrodes from contact with said members, solder alloy and flowable insulation coating while said solder alloy and flowable insulation coating are in a melted state; and
quenching said third current pulse after withdrawing said electrodes from said members for cleaning said electrodes of said flowable insulation coating.