Title:
SPOT WELDED JOINT AND SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2017/064817
Kind Code:
A1
Abstract:
Provided are a spot welded joint and spot welding method with which high cross tension strength (CTS) can be obtained even if one or more high-strength steel plates are included.
Provided is a spot welded joint 1 that includes a plurality of steel plates, wherein the one or more steel plates are high-strength steel plates with a tensile strength of 750 - 2500 MPa, and letting plane A be a plane overlapping a high-strength steel plate S1 disposed on the outermost side in a cross-section in the direction of plate thickness of the steel plate and another steel plate 1B and letting plane B be a plane parallel to the plane A and passing through a point 1/2 the distance between a nugget end position E on the high-strength steel plate S1 side, which is on a line L1 in the direction of plate thickness, and an intersection O between the plane A and the line L1, the average value for width of a block that is constituted of lath martensite is 0.5 - 7.0 µm in a square region SA that is included in a heat affected zone 4 with the high-strength steel plate S1 as the base material and has a side of 30 µm with the center being an intersection X of a line L2, which is parallel with a tangent line in any position on the nugget end line NEL sandwiched between the plane A and plane B and is separated 250 µm on the heat affected zone side with respect to the tangent line, and a line L3 perpendicular to L2.
Inventors:
WAKABAYASHI CHISATO (JP)
FURUSAKO SEIJI (JP)
WATANABE FUMINORI (JP)
MIYAZAKI YASUNOBU (JP)
OKADA TOHRU (JP)
FURUSAKO SEIJI (JP)
WATANABE FUMINORI (JP)
MIYAZAKI YASUNOBU (JP)
OKADA TOHRU (JP)
Application Number:
PCT/JP2015/079368
Publication Date:
April 20, 2017
Filing Date:
October 16, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B23K11/16; B23K11/11; B23K11/24
Domestic Patent References:
| WO2011025015A1 | 2011-03-03 |
Foreign References:
| JP2014180698A | 2014-09-29 | |||
| US20150174688A1 | 2015-06-25 | |||
| JP2013103273A | 2013-05-30 | |||
| JP2013078782A | 2013-05-02 |
Other References:
See also references of EP 3363575A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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