# US 11,440,126 B2 · Method for resistance welding

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- Number: US 11,440,126 B2
- Document ID: US11440126B2
- Status: Granted
- Kind: B2
- Application number: 16/427,089
- Filed: 2019-05-30
- Published: 2019-09-12
- Granted: 2022-09-13
- Earliest claimed: 2014-12-05
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Hyun Woo Lee
- Web page: https://patentgrep.com/patent/US11440126B2

## CPC

- B23K 11/11: Spot welding
- B23K 11/314: {Spot welding guns, e.g. mounted on robots}
- B23K 11/315: {with one electrode moving on a linear path}
- B23K 2101/006: {Vehicles}
- Y10S 901/42: Welding
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A welding device of a robot arm includes a welding machine having a first pressing member which includes a cylindrical first pressing part and a second pressing member which includes a second pressing part inserted into a hollow of the first pressing part. A transformer supplies a positive (+) current to the first pressing member and a negative (−) current to the second pressing member. The first and second pressing parts have the same co-axis.

## Claims

### Claim 1

A method for welding a vehicle part to a vehicle body using a welding device, the method comprising steps of:
supplying power to a transformer; and
supplying a positive (+) current to a first pressing member through a positive (+) bus bar and a negative (−) current to a second pressing member through a negative (−) bus bar,
wherein the welding device supplies the positive (+) current while a first pressing part of the first pressing member presses the vehicle part having a protrusion and then supplies the negative (−) current while a second pressing part of the second pressing member presses the protrusion by penetrating through the first pressing part, and
wherein the protrusion has a size larger than a diameter of the first pressing part of the first pressing member.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first pressing part presses the protrusion with a pressing force of 50 to 100 kgf.

### Claim 3 (depends on 1)

The method to claim 1, wherein the protrusion has a height ranges from 0.8 mm to 1.5 mm and a width thereof is 5 mm.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising steps of:
pressing the vehicle part by the first pressing part; and
adhering the second pressing part to the vehicle part while penetrating through the first pressing part and generating high heat by the positive (+) current and the negative (−) current to weld the vehicle part to the vehicle body.