Title:
WELDED JOINT WITH EXCELLENT FATIGUE-RESISTANCE CHARACTERISTICS, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2009/104798
Kind Code:
A1
Abstract:
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.
Inventors:
NOSE TETSURO (JP)
SHIRAHATA HIROYUKI (JP)
SHIMANUKI HIROSHI (JP)
SHIRAHATA HIROYUKI (JP)
SHIMANUKI HIROSHI (JP)
Application Number:
PCT/JP2009/053302
Publication Date:
August 27, 2009
Filing Date:
February 18, 2009
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
NOSE TETSURO (JP)
SHIRAHATA HIROYUKI (JP)
SHIMANUKI HIROSHI (JP)
NOSE TETSURO (JP)
SHIRAHATA HIROYUKI (JP)
SHIMANUKI HIROSHI (JP)
International Classes:
B23K31/00; B23K9/23; B23K35/30; B23P9/04; C22C38/00; C22C38/04; C22C38/58; B23K103/04
Foreign References:
| JP2004130313A | 2004-04-30 | |||
| JP2004360054A | 2004-12-24 | |||
| JP2005279743A | 2005-10-13 | |||
| JPH09314337A | 1997-12-09 | |||
| JP2007119811A | 2007-05-17 | |||
| JP2006175511A | 2006-07-06 | |||
| JP2007210023A | 2007-08-23 | |||
| JP2007283355A | 2007-11-01 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg. 5-1,Toranomon 3-chom, Minato-ku Tokyo 23, JP)
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