US 12,366,556 B2
Ultrasonic testing method and ultrasonic testing device
Kaoru Shinoda, Osaka (JP); Masamitsu Abe, Osaka (JP); Joichi Murakami, Osaka (JP); and Hiroshi Hattori, Osaka (JP)
Assigned to KANADEVIA CORPORATION, Osaka (JP)
Appl. No. 17/761,889
Filed by KANADEVIA CORPORATION, Osaka (JP)
PCT Filed Jul. 9, 2020, PCT No. PCT/JP2020/026797
§ 371(c)(1), (2) Date Mar. 18, 2022,
PCT Pub. No. WO2021/053939, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019-169928 (JP), filed on Sep. 19, 2019.
Prior Publication US 2022/0334088 A1, Oct. 20, 2022
Int. Cl. G01N 29/265 (2006.01); G01N 29/04 (2006.01); G01N 29/06 (2006.01); G01N 29/24 (2006.01); G01N 29/26 (2006.01)
CPC G01N 29/265 (2013.01) [G01N 29/043 (2013.01); G01N 29/069 (2013.01); G01N 29/2437 (2013.01); G01N 29/262 (2013.01); G01N 2291/0234 (2013.01); G01N 2291/0289 (2013.01); G01N 2291/044 (2013.01); G01N 2291/106 (2013.01); G01N 2291/267 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An ultrasonic testing method for detecting a flaw of a subject being a tube material by using ultrasonic waves, the method comprising:
scanning in a scanning range specified for the subject by moving an array probe including a plurality of ultrasonic wave emission elements, the array probe being moved in a direction different from an array placement direction of the ultrasonic wave emission elements while performing flaw testing with ultrasonic waves emitted from the ultrasonic wave emission elements into the scanning range, in the scanning, the array probe being rotated about a center axis of the tube material along an inner surface of the tube material, the array probe being inserted in the tube material such that the ultrasonic wave emission elements placement direction is parallel to a lengthwise direction of the tube material;
creating flaw detection images at rotation angles of the array probe rotated about the center axis of the tube material, each flaw detection image being created as a result of flaw testing in the scanning based on an echo of ultrasonic waves emitted by the array probe; and
determining that a flaw is present at a point where a bottom echo is not obtained by scanning or at a point having a weaker bottom echo than other points in the scanning range, wherein in the determining, the flaw detection images being compared between the rotation angles,
wherein in the creating of each of the flaw detection images, a bottom echo region is extracted as a part expected to have a bottom echo in each of the flaw detection images, wherein a whole-angle image is created such that images of the bottom echo region at the rotation angles are arranged in an order of the rotation angles, and
wherein in the determining, it is determined that a flaw is present at rotation angles having a groove signal where a bottom echo is not obtained or a bottom echo is weaker than other rotation angles in the whole-angle image.