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Title:
MULTIPLE PEENING TREATMENT METHOD FOR WELD TOE SECTION
Document Type and Number:
WIPO Patent Application WO/2011/055848
Kind Code:
A1
Abstract:
A multiple peening treatment method wherein tip radius of curvature (Ri) of a vibration terminal used for an i-th time and tip radius of curvature (Ri + 1) of a vibration terminal used for an (i + 1)th time satisfy Ri < Ri + 1 ≤ 2Ri, wherein the first peening treatment uses a vibration terminal in which the tip radius of curvature (Ri)is 1-3 mm, and is performed until the weld toe line and overlap defects are removed, wherein the second or subsequent peening treatment is performed until overlap defects are removed with the vibration terminal of the tip radius of curvature (Ri + 1), and wherein the final peening treatment is performed using a vibration terminal in which the tip radius of curvature (Ri + 1) is 4.0 mm or more.

Inventors:
SHIMANUKI, Hiroshi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2010/070060
Publication Date:
May 12, 2011
Filing Date:
November 04, 2010
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)
International Classes:
B23K31/00; C21D7/06
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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