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Title:
METHOD FOR IMPROVING FATIGUE STRENGTH OF LAP-WELDED JOINT, LAP-WELDED JOINT MANUFACTURING METHOD, AND LAP-WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2017/131186
Kind Code:
A1
Abstract:
The fatigue strength of a lap-welded joint 10, wherein an overlap portion 12a of a first steel member 12 and an overlap portion 14a of a second steel member 14 are overlapped, and the edge portion of the first steel member 12 is welded to the surface (14b) of the second steel member 14 by means of a welded part 16 extending along that edge portion, is improved by the following method. First, with the direction perpendicular to the direction of extension of the welded part 16 and parallel to the surface 14b of the second steel member 14 as the reference direction Y, movement of the lap-welded joint 10 in the reference direction Y is restricted, and movement of the first steel member 12 and the second steel member 14 in the plate thickness direction is restricted. In this state a portion 14a of the second steel member 14 is heated so as to form a melted part 18 on the portion 14a of the second steel member 14.

Inventors:
KIKUCHI SHOTA (JP)
FUKUMOTO MANABU (JP)
Application Number:
PCT/JP2017/003027
Publication Date:
August 03, 2017
Filing Date:
January 27, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B23K31/00; B23K9/02; B23K15/00; B23K26/21
Domestic Patent References:
WO2012114532A12012-08-30
Foreign References:
JP2014004609A2014-01-16
JP2003154481A2003-05-27
CN104625455A2015-05-20
Other References:
See also references of EP 3409410A4
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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