发明名称 |
RESISTANCE SPOT WELDING METHOD FOR HIGH-TENSILE STEEL PLATES, AND RESISTANCE SPOT WELDING JOINT |
摘要 |
Provided is a method of resistance spot welding of welding a sheet set including a high strength steel sheet with which a high joint strength can be achieved even for a high Ceq material. A method of resistance spot welding a sheet set of two or more lapped steel sheets by weld the sheet set while clamping and pressing the sheet set between a pair of welding electrodes includes a first welding step of applying an weld current Im (kA) and forming a nugget having a nugget diameter d (mm) that satisfies the following inequality (1); a cooling step (A), subsequent to the foregoing first welding, of cooling the sheet set while continuing to press the sheet set; and a second welding step of performing two-step welding, 3 × ˆšt m ‰¤ d ‰¤ 6 × ˆšt m
where t m is the thickness (mm) of the thinnest one of the foregoing two or more steel sheets. |
申请公布号 |
EP2769797(A4) |
申请公布日期 |
2016.02.17 |
申请号 |
EP20120841263 |
申请日期 |
2012.10.17 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
TANIGUCHI, KOICHI;OKITA, YASUAKI;IKEDA, RINSEI |
分类号 |
B23K11/24;B23K11/11;B23K11/16 |
主分类号 |
B23K11/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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