Title:
JOINED BODY OF STEEL SHEETS, METHOD FOR MANUFACTURING JOINED BODY OF STEEL SHEETS, AND SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2016/125446
Kind Code:
A1
Abstract:
Provided is a joined body in which the strength required of welded portions can be maintained during the joined body production process as well as during use. The joined body of steel sheets pertaining to the present invention is a joined body of steel sheets produced by superposing a plurality of steel sheets having an element composition containing, in mass%, C: 0.4% or less, Si: 3.0% or less, Al: 3.0% or less, Mn: 0.2%-6.0%, P: 0.1% or less, and S: 0.07% or less, with the remainder being Fe and unavoidable impurities, and having tensile strength of 1,470 MPa or less and sheet-metal thickness of 0.3 mm-5.0 mm, wherein the joined body is formed by pre-coating at least one interface among the superposed surfaces with an adhesive and a carbon-supplying agent, and then performing welding, the welded portions of the joined body having a nugget diameter of 2.8√t (mm) or greater, and the amount of C being increased by 0.02 mass% or more, as compared with the steel sheets prior to coating with the adhesive and the carbon-supplying agent.
Inventors:
MATSUDA HIROSHI (JP)
OKITA YASUAKI (JP)
MATSUSHITA MUNEO (JP)
IKEDA RINSEI (JP)
OI KENJI (JP)
OKITA YASUAKI (JP)
MATSUSHITA MUNEO (JP)
IKEDA RINSEI (JP)
OI KENJI (JP)
Application Number:
PCT/JP2016/000328
Publication Date:
August 11, 2016
Filing Date:
January 22, 2016
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/16; C22C38/00; C22C38/60
Foreign References:
| JP5043236B2 | 2012-10-10 | |||
| JP2003010976A | 2003-01-15 | |||
| JP2012157888A | 2012-08-23 | |||
| US20110073572A1 | 2011-03-31 |
Other References:
See also references of EP 3254796A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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