The Development of Simplified Ultrasonic CT System and Its Application to the Evaluation of Weld Metal

In this paper, as a new measurement method to estimate the change of material condition, the simplified ultrasonic CT system, which uses the information of three directions, that is, 90°, + 45° and -45° about inspection plane is proposed. Use of simplified CT system has two merits: Firstly, the meas...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2001, Vol.15 (1), p.52-60
Main Authors: KIM, Kyung-Cho, FUKUHARA, Hiroaki, YAMAWAKI, Hisashi, SAITO, Tetsuya
Format: Article
Language:English
Subjects:
Acoustical measurements and instrumentation
Acoustics
Analysing. Testing. Standards
Applied sciences
Cross-disciplinary physics: materials science
rheology
Defects
Estimates
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Inspection
Materials science
Materials testing
Mathematical analysis
Measurement methods
Metals. Metallurgy
Nondestructive testing
Nondestructive testing: ultrasonic testing, photoacoustic testing
Physics
Planes
Testing for defects
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Summary:In this paper, as a new measurement method to estimate the change of material condition, the simplified ultrasonic CT system, which uses the information of three directions, that is, 90°, + 45° and -45° about inspection plane is proposed. Use of simplified CT system has two merits: Firstly, the measurement time is very short compared with general CT. Secondly, it can detect sensitively small defect in vertical or slant direction about inspection plane because the obtained image is CT image calculated from three directions. From these merits, this method can be considered as an effective method to evaluate material conditions. The basic performance of the proposed method was confirmed through several specimens with several simple defects. In order to confirm the applicability of actual NDT, several kinds of welded specimens are investigated. The result showed that the CT image obtained had good agreement with actual defect of specimens.[PUBLICATION ABSTRACT]
ISSN:1226-4865
1738-494X
1976-3824
DOI:10.1007/BF03184798