# US 2019/0168341 A1 · Method of Manufacturing Tailor Welded Blanks

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- Number: US 2019/0168341 A1
- Document ID: US20190168341A1
- Status: Published application
- Kind: A1
- Application number: 15/975,135
- Filed: 2018-05-09
- Published: 2019-06-06
- Earliest claimed: 2017-12-01
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; KIA Motors Corporation
- Inventors: So Youn Kim
- Web page: https://patentgrep.com/patent/US20190168341A1

## CPC

- B23K 26/211: with interposition of special material to facilitate connection of the parts
- B23K 26/0608: {in the same heat affected zone [HAZ] (B23K26/0613, B23K26/0619 take precedence)}
- B23K 26/0626: {Energy control of the laser beam (B23K26/0622 takes precedence)}
- B23K 26/0652: {comprising prisms}
- B23K 26/0676: {into dependently operating sub-beams, e.g. an array of spots with fixed spatial relationship or for performing simultaneously identical operations}
- B23K 26/0869: {Devices involving movement of the laser head in at least one axial direction}
- B23K 26/24: Seam welding
- B23K 35/3066: {with Ni as next major constituent}
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/32: with boron
- B23K 2101/185: {Tailored blanks}
- 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
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A method of manufacturing tailor welded blanks includes bringing a pair of objects to be welded into contact with each other. The objects are formed of different materials having different thicknesses or strengths. The method further includes adjusting the heat input of a radiated laser beam and dividing the radiated laser beam into a preceding laser beam and a following laser beam in a welding direction using an optical prism. The method further includes forming a welded part by sequentially radiating the preceding laser beam and the following laser beam to the pair of objects to be welded while supplying a filler wire to welded regions of the pair of objects to be welded.

## Claims

### Claim 1

A method of manufacturing tailor welded blanks, comprising:
bringing a pair of objects to be welded into contact with each other, the pair of objects being formed of different materials having different thicknesses or strengths;
adjusting a heat input of a radiated laser beam, and dividing the radiated laser beam into a preceding laser beam and a following laser beam in a welding direction using an optical prism; and
forming a welded part by sequentially radiating the preceding laser beam and the following laser beam to the pair of objects to be welded while supplying a filler wire to regions of the pair of objects to be welded.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the division of the radiated laser beam further comprises:
dividing the radiated laser beam into the preceding laser beam and the following laser beam using the optical prism so that a heat input of the preceding laser beam is 40-60% of the heat input of the radiated laser beam.

### Claim 3 (depends on 1)

The method according to claim 1, wherein, in the adjustment of the heat input, the heat input of the radiated laser beam is 30-130 kJ/m and is calculated by the equation Q=η(P/v),
wherein, Q indicates heat input (kJ/m), η indicates an absorption coefficient of the objects to be welded, P indicates laser beam output (k/w), and v indicates welding speed (m/min).

### Claim 4 (depends on 2)

The method according to claim 2, wherein, in the division of the radiated laser beam, the radiated laser beam is divided into the preceding laser beam and the following laser beam so that the preceding laser beam and the following laser beam have the same heat input.

### Claim 5 (depends on 2)

The method according to claim 2, wherein, in the division of the radiated laser beam, the radiated laser beam is divided into the preceding laser beam and the following laser beam so that a beam distance between the preceding laser beam and the following laser beam sequentially radiated to the pair of objects to be welded in the welding direction is in the range of approximately 1.12-5 mm.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the pair of objects to be welded are plated steel sheets having different thicknesses or strengths and comprise 0.19-0.25 wt % of C, 0.20-0.40 wt % of Si, 1.10-1.60 wt % of Mn, 0.03 wt % or less of P, 0.015 wt % or less of S, 0.10-0.60 wt % of Cr, 0.0008-0.0050 wt % of B, the remainder wt % of Fe and other inevitable impurities, each plated steel sheet having an Al—Si plating layer.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the filler wire includes 0.6-0.9 wt % of C, 0.3-0.9 wt % of Mn, 1.6-3.0 wt % of Ni, the remainder wt % of Fe and other inevitable impurities.