The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 2012
Filed:
May. 18, 2007
Yukinori Iizuka, Chiyoda-ku, JP;
Kazuhito Kenmochi, Chiyoda-ku, JP;
Hiroyasu Yokoyama, Chiyoda-ku, JP;
Tomohiro Inoue, Chiyoda-ku, JP;
Shigeto Sakashita, Chiyoda-ku, JP;
Yukinori Iizuka, Chiyoda-ku, JP;
Kazuhito Kenmochi, Chiyoda-ku, JP;
Hiroyasu Yokoyama, Chiyoda-ku, JP;
Tomohiro Inoue, Chiyoda-ku, JP;
Shigeto Sakashita, Chiyoda-ku, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
An ultrasonic flaw detection is performed to a welded portionof a pipe body, a defect detection threshold value is determined based on the signal intensity difference between the total area of the defects existing in the region of an ultrasonic beam on a welded surface and an artificial defect, and a quality control of the pipe body is performed based on the defect detection threshold value. An equivalent defect diameter is determined from the defect density on the welded surface of the welded portion of the pipe body in a pipe axis direction and the area of the ultrasonic beam on the welded surface based on the total area of the defects existing in the region of the ultrasonic beam, and the defect detection threshold value is determined based on the equivalent defect diameter and the signal intensity difference of the artificial defect.