Title:
HIGH HEAT INPUT BUTT WELDING JOINT EXHIBITING EXCELLENT CHARACTERISTICS IN RESISTANCE TO OCCURRENCE OF BRITTLE FRACTURE
Document Type and Number:
WIPO Patent Application WO2005037480
Kind Code:
B1
Abstract:
A high heat input butt welding joint exhibiting excellent characteristics in the resistance to the occurrence of brittle fracture which is a butt welding joint in a welded structure, characterized in that (a1) a weld metal has a hardness being 110 % or less relative to that of a base material, or (a2) a weld metal has a hardness being 70 to 110 % relative to that of a base material, and optionally, (b) a weld metal has a width being 70 % or less relative to the thickness of a base plate, (c) the region of a weld heat affected zone being so softened as to have a hardness being 95 % or less relative to that of the base material zone not affected by heat has a width of 5 mm or more, and/or (d) the weld-affected zone (HAZ) adjacent to a weld melt line has an old austenite grain diameter of 200 mum or less.
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Inventors:
ISHIKAWA TADASHI (JP)
INOUE TAKEHIRO (JP)
SHIMANUKI HIROSHI (JP)
KOSEKI TADASHI (JP)
OOTANI JUN (JP)
MINAGAWA MASANORI (JP)
KOJIMA AKIHIKO (JP)
INOUE TAKEHIRO (JP)
SHIMANUKI HIROSHI (JP)
KOSEKI TADASHI (JP)
OOTANI JUN (JP)
MINAGAWA MASANORI (JP)
KOJIMA AKIHIKO (JP)
Application Number:
PCT/JP2004/016066
Publication Date:
June 16, 2005
Filing Date:
October 22, 2004
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
ISHIKAWA TADASHI (JP)
INOUE TAKEHIRO (JP)
SHIMANUKI HIROSHI (JP)
KOSEKI TADASHI (JP)
OOTANI JUN (JP)
MINAGAWA MASANORI (JP)
KOJIMA AKIHIKO (JP)
ISHIKAWA TADASHI (JP)
INOUE TAKEHIRO (JP)
SHIMANUKI HIROSHI (JP)
KOSEKI TADASHI (JP)
OOTANI JUN (JP)
MINAGAWA MASANORI (JP)
KOJIMA AKIHIKO (JP)
International Classes:
B23K9/00; B23K9/02; B23K9/23; B23K31/12; B23K35/30; C22C38/00; C22C38/14; B23K103/04; (IPC1-7): B23K9/23; B23K35/30; C22C38/00; C22C38/06
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