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Title:
WELDED STRUCTURE HAVING EXCELLENT BRITTLE CRACK ARREST CHARACTERISTICS
Document Type and Number:
WIPO Patent Application WO/2017/217515
Kind Code:
A1
Abstract:
A doubler member has a td/Wd ratio, of plate thickness td to plate width Wd, of less than 2, and said doubler member is overlaid on and joined by fillet bonding to the surface of a member to be joined that has a plate thickness of greater than or equal to 50mm, and furthermore, a bonding member is bonded by welding to the surface of the fillet-welded doubler member, resulting in a welded structure. On the surface of overlap between the surface of the doubler member and the surface of the member to be joined, an unwelded portion is formed which, in the joint cross section, is 95% or more than the plate thickness td of the doubler member. Further, the fillet welding condition is adjusted, and the toughness of the weld metal is adjusted such that the fracture appearance transition temperature vTrs (°C) of the fillet weld metal varies according to the fillet weld leg length L and, in relation with the plate thickness tf of the member to be joined, satisfies vTrs ≦ -5L + 65 - 1.5(tf-75) ... (1b) if L ≧ 20mm, and satisfies vTrs ≦ -35 - 1.5(tf - 75) ... (1c) if L < 20mm. Hereby, the fillet weld metal part makes it possible to arrest propagation of brittle cracks occurring from the member to be bonded or the bonding member, and it is possible to provide a welded structure which has excellent brittle crack arrest characteristics and is suitable for use in a hull structure.

Inventors:
HANDA TSUNEHISA (JP)
IGI SATOSHI (JP)
OI KENJI (JP)
TOYODA MASANOBU (JP)
KIJI NOBORU (JP)
Application Number:
PCT/JP2017/022212
Publication Date:
December 21, 2017
Filing Date:
June 15, 2017
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
JAPAN MARINE UNITED CORP (JP)
International Classes:
B23K31/00; B23K9/00; B23K9/02; B63B9/06
Domestic Patent References:
WO2013038685A12013-03-21
WO2016143354A12016-09-15
Foreign References:
JP2008023594A2008-02-07
JPS57116392U1982-07-19
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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