Lap fillet arc welded joint

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United States of America Patent

PATENT NO 11592045
APP PUB NO 20200378420A1
SERIAL NO

16636788

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Abstract

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A lap fillet arc welded joint includes: a first steel sheet and a second steel sheet which are overlapped each other, the first steel sheet and the second steel sheet each having a tensile strength of 950 MPa or more; and a weld metal which extends along a corner formed by an upper surface of the first steel sheet and an end surface of the second steel sheet. When: a toe angle of the weld metal is defined as β; the total number of concave portions present on the surface of the weld metal included a range of 0.4 mm or less from a fusion boundary is defined as NA; and the number of concave portions in contact with ferrite grains having a maximum grain size of 10 μm or more is defined as NB, the weld metal satisfies the following conditional expressions (1) and (2) at the same time.

description='In-line Formulae' end='lead'0°<β<30°  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'NB/NA≤0.70  (2)description='In-line Formulae' end='tail'

(Here, NA is 20 or more).

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Patent Owner(s)

  • 501 NIPPON STEEL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kodama, Shinji Tokyo, JP 123 1161
Matsuda, Kazuki Tokyo, JP 12 85
Tokunaga, Masatoshi Tokyo, JP 14 197
Watanabe, Kotaro Tokyo, JP 82 406

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