Title:
ULTRASONIC FLAW-DETECTION METHOD, ULTRASONIC FLAW-DETECTION DEVICE, AND METHOD FOR PRODUCING PIPE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2013/114639
Kind Code:
A1
Abstract:
In order to provide an ultrasonic flaw-detection method, an ultrasonic flaw- detection device, and a method for producing a pipe material that enable detection of a recessed defect, even a shallow, overlapping defect, occurring on an inner surface of a metal pipe material such as for a steel pipe, the present invention is provided with the following: a waveform memory (11) for acquiring and retaining the waveform data of an echo signal from when a steel pipe (1) and an ultrasonic probe (2), which emits ultrasonic signals toward an inner surface (B) of the steel pipe (1), are moved relatively; a signal analysis unit (12) for calculating, on the basis of the retained waveform data, the path length until reception of the echo signal coming from the inner surface (B) as well as the rate of change in the path length; and a defect detection unit (13) for detecting a defect (BW) on the inner surface (B) on the basis of the path length and the rate of change in the path length.
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Inventors:
IIZUKA YUKINORI (JP)
OZEKI TAKAFUMI (JP)
MATSUI YUTAKA (JP)
OZEKI TAKAFUMI (JP)
MATSUI YUTAKA (JP)
Application Number:
PCT/JP2012/061836
Publication Date:
August 08, 2013
Filing Date:
May 09, 2012
Export Citation:
Assignee:
JFE STEEL CORP (JP)
IIZUKA YUKINORI (JP)
OZEKI TAKAFUMI (JP)
MATSUI YUTAKA (JP)
IIZUKA YUKINORI (JP)
OZEKI TAKAFUMI (JP)
MATSUI YUTAKA (JP)
International Classes:
G01N29/04
Foreign References:
| JPH049659A | 1992-01-14 | |||
| JP2011153974A | 2011-08-11 | |||
| JP2002031625A | 2002-01-31 | |||
| JP2006132981A | 2006-05-25 | |||
| JP2003302381A | 2003-10-24 | |||
| JPH06317418A | 1994-11-15 | |||
| JP2008070325A | 2008-03-27 |
Other References:
See also references of EP 2811294A4
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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Claims: