WELDED JOINT WITH EXCELLENT FATIGUE-RESISTANCE CHARACTERISTICS, AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2009/104798

A1

Provided are: a welded joint that exhibits the effect of ultrasonic shock treatment more efficiently, and has improved fatigue-resistance characteristics; and a method for producing the joint. In this joint, the average hardness of the weld zone and of the heat-affected zone is 15% to 50% higher than that of the steel stock, and at the weld toe, an ultrasonic shock scar is formed which has a radius of curvature r of 1.0 to 10.0 mm at the cross-section perpendicular to the weld-line, and a thickness d of 1.0 mm or less from the surface of the steel stock.

NOSE, Tetsuro (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 10080, JP)
野瀬哲郎 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 10080, JP)
SHIRAHATA, Hiroyuki (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 10080, JP)

JP2009/053302

August 27, 2009

February 18, 2009

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NIPPON STEEL CORPORATION (6-3 Otemachi 2-chome, Chiyoda-ku Tokyo, 71, 10080, JP)
新日本製鐵株式会社 (〒71 東京都千代田区大手町二丁目６番３号 Tokyo, 10080, JP)
NOSE, Tetsuro (6-3 Otemachi 2-chome, Chiyoda-k, Tokyo 71, 10080, JP)
野瀬哲郎 (〒71 東京都千代田区大手町二丁目６番３号新日本製鐵株式会社内 Tokyo, 10080, JP)

B23K31/00; B23K9/23; B23K35/30; B23P9/04; C22C38/00; C22C38/04; C22C38/58; B23K103/04; B23K31/00; B23K9/23; B23K35/30; B23P9/00; C22C38/00; C22C38/04; C22C38/58

AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1,Toranomon 3-chom, Minato-ku Tokyo 23, 10584, JP)

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