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Application of flexible PAUT probe for weld inspection of piping elbows
Author(s): Ik Keun Park; Tae Sung Park; Seung Mi Lee; Seong Jin Lim; Yukio Ogura
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Paper Abstract

Nondestructive testing (NDT), which is applied to the manufacturing/installation of power generation facilities and preventive maintenance, is one of the key element technologies that are essential for "safety and quality assurance" as diagnosis and maintenance technology. Radiography testing (RT) is the main testing method; however, ultrasonic testing (UT) is applied together with RT in most cases. This significantly impacts process delays and economic losses. Therefore, in the industrial field, the introduction and utilization of phased array UT (PAUT) have been aggressively demanded as a new nondestructive volumetric examination technology that can reduce the dependency on RT and possibly replace it. PAUT not only makes it easier to test specimens with complex shapes that are difficult to test with conventional UT, but it also enables high-speed testing because it can electronically control the scanning of the ultrasonic beam. However, in the case of applying PAUT to the testing of a weld zone with a curved shape, such as a piping elbow weld zone, it is not easy to secure the objective and achieve reliable test data because contact with the probe is difficult. Therefore, in this study, flexible PAUT probe was developed that was capable of testing piping elbow weld zones, and its effectiveness was verified by comparing it with the use of a wedge, which is normally used for the testing of pipes with curved structures. Welding specimens were fabricated (including natural defects) in accordance with ASME standards, and artificial notches were machined. The possibility of overcoming the application limit of the current PAUT technology and further improving the reliability of the inspection results were confirmed through signal acquisition and an analysis according to the probe contact position (elbow or pipe surface).

Paper Details

Date Published: 1 April 2019
PDF: 7 pages
Proc. SPIE 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII, 109711V (1 April 2019); doi: 10.1117/12.2523323
Show Author Affiliations
Ik Keun Park, Seoul National Univ. of Science and Technology (Korea, Republic of)
Tae Sung Park, Seoul National Univ. of Science and Technology (Korea, Republic of)
Seung Mi Lee, Seoul National Univ. of Science and Technology (Korea, Republic of)
Seong Jin Lim, Korea Inspection & Engineering Co., Ltd. (Korea, Republic of)
Yukio Ogura, Japan Probe Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 10971:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII
Andrew L. Gyekenyesi, Editor(s)

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