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Title:
ULTRA HIGH-STRENGTH WELDED JOINT AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/155620
Kind Code:
A1
Abstract:
Disclosed is an ultra high-strength welded joint having excellent strength and toughness, which uses a steel sheet having a thickness of 4-12 mm and contains a welded metal that has a martensite single phase structure. The ultra high-strength welded joint is characterized in that: in a cross section perpendicular to the welding direction, the welded metal has a cross-sectional shape wherein the width W1 at the steel sheet surface is 2.0-7.0 mm and the width W2 at a depth of 3/4 of the thickness from the steel sheet surface is 0.5-2.4 mm; and the welded metal contains more than 0.09% but 0.24% or less of C, 0.2-1.0% of Si, 0.5-2.5% of Mn, 0.02% or less of P, 0.02% or less of S, 0.004-0.08% of Al, 0.005-0.15% of Ti, 0.005-0.05% of O and 1.0-9% of Ni, and has a carbon equivalent (Ceq) of 0.40-1.00% and a Y value, which is defined by {([Si] + [Mn])/40 + [Al] + [Ti]}, of 0.07-0.20%. Also disclosed is a method for producing the welded joint by a single pass of laser hybrid welding.

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Inventors:
NAKAMURA, Shuichi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
中村　修一 (〒71 東京都千代田区丸の内二丁目６番１号新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
Application Number:
JP2011/063425
Publication Date:
December 15, 2011
Filing Date:
June 06, 2011
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
NAKAMURA, Shuichi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
International Classes:
B23K35/30; B23K9/16; B23K9/173; B23K9/23; B23K26/20; C22C38/00; C22C38/58
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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