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:
Feb. 15, 2011
Filed:
Dec. 19, 2007
Masahiro Hirao, Osaka, JP;
Hirotsugu Ogi, Osaka, JP;
Tsutomu Kikuchi, Ichihara, JP;
Kiyohazu Fujimaki, Osaka, JP;
Masahiro Hirao, Osaka, JP;
Hirotsugu Ogi, Osaka, JP;
Tsutomu Kikuchi, Ichihara, JP;
Kiyohazu Fujimaki, Osaka, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Japan Industrial Testing Corporation, Osaka, JP;
Abstract
An electromagnetic ultrasonic flaw detection method is provided which ensures highly accurate inspection of an interior surface of a fin-implanted heat transfer tube for detection of corrosion and requires less time for the inspection, no contact medium such as water, and less time and less costs for a pretreatment. The method may include moving an EMAT in a fin-implanted heat transfer tube of an air cooling heat exchanger axially of the tube; causing the EMAT to generate an axially symmetric SH wave by utilizing an electromagnetic force to vibrate a tube body of the fin-implanted heat transfer tube to cause resonance; causing the EMAT to detect a resonant frequency; and if the detected resonant frequency is different from a resonant frequency observed when the tube body has a normal wall thickness, judging that an interior surface of the tube body has a corroded portion.