# US 10,864,595 B2 · Method of projection welding hardware to steel sheet for hot stamping

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- Number: US 10,864,595 B2
- Document ID: US10864595B2
- Status: Granted
- Kind: B2
- Application number: 15/857,209
- Filed: 2017-12-28
- Published: 2018-09-06
- Granted: 2020-12-15
- Earliest claimed: 2017-03-06
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Yeon-Jung Hwang; Young-Tae Kim
- Web page: https://patentgrep.com/patent/US10864595B2

## CPC

- B23K 11/11: Spot welding
- B23K 9/09: Arrangements or circuits for arc welding with pulsed current or voltage
- B23K 9/1068: {Electric circuits for the supply of power to two or more arcs from a single source}
- B23K 11/0046: {the extremity of a small piece being welded to a base, e.g. cooling studs or fins to tubes or plates}
- B23K 11/14: Projection welding
- B23K 11/163: {Welding of coated materials}
- B23K 11/25: Monitoring devices
- B23K 2101/006: {Vehicles}
- B23K 2101/18: Sheet panels
- B23K 2101/34: Coated articles {; Surface treated articles}
- B23K 2103/04: Steel {or steel} alloys
- 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

## Abstract

A method of projection welding hardware to a plated steel sheet for hot stamping, may include pressing hardware and a plated steel sheet in a state in which a welding projection on the hardware is in contact with the plated steel sheet, supplying a primary current to the hardware and the plated steel sheet in a state in which they are pressed, and supplying a secondary current to the hardware and the plated steel sheet.

## Claims

### Claim 1

A method of projection welding hardware to a plated steel sheet for hot stamping, the method comprising:
pressing hardware and a plated steel sheet in a state in which a welding projection on the hardware is in contact with the plated steel sheet;
supplying a primary current to the hardware and the plated steel sheet in a state in which the hardware and the plated steel sheet are pressed; and
supplying a secondary current to the hardware and the plated steel sheet,
wherein the primary current has a value of 100% to 150% of the secondary current so that a plated layer of the plated steel sheet is melted and removed, and
wherein the secondary current has a value of a welding temperature.

### Claim 2 (depends on 1)

The method of claim 1, further including cooling the plated steel sheet and the hardware that are heated in the supplying of the primary current, between the supplying of the primary current and the supplying of the secondary current.

### Claim 3 (depends on 1)

The method of claim 1, wherein the primary current is applied for a time period until the welding projection is collapsed by heating so that the plated layer is extruded and removed.

### Claim 4 (depends on 3)

The method of claim 3, wherein the primary current is applied for the time period of 5 cycles or less.

### Claim 5 (depends on 1)

The method of claim 1, wherein the plated steel sheet is an Al—Si-plated steel sheet.

### Claim 6 (depends on 2)

The method of claim 2, wherein, in the cooling the plated steel sheet and the hardware, the plated steel sheet and the hardware are cooled after the supplying of the primary current is stopped.

### Claim 7 (depends on 2)

The method of claim 2, wherein the cooling of the plated steel sheet and the hardware is performed until the plated steel sheet and the hardware are thermally balanced.