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Time-of-flight diffraction ultrasonics

About: Time-of-flight diffraction ultrasonics is a research topic. Over the lifetime, 544 publications have been published within this topic receiving 3189 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, three propylene spherical tanks which have both the same manufacturing parameters and conditions have been assessed based on risk assessment and non-destructive testing technology, and the results of inspection verifies the reliability of risk assessment, which can also provide significant guidance for future complete equipment inspection.
Abstract: Three propylene spherical tanks which have both the same manufacturing parameters and conditions have been assessed based on risk assessment and non-destructive testing technology. One of the spherical tanks is stopped for comprehensive inspection, and the result of inspection verifies the reliability of risk assessment, which is applied to other two unopened propylene spherical tanks. Meanwhile, in order to make overall inspection level meet the requirements of the risk assessment and so reduce spherical tanks assessing risk, ultrasonic diffraction detection (TOFD) with high detection rate and fluorescent magnetic surface detection technology are adopted to ensure comprehensive test meeting the risk assessment requirements, which can also provide significant guidance for future complete equipment inspection.

2 citations

01 Jan 2000
TL;DR: In this article, the results of a manual Time of Flight Diffraction (TOFD) inspection of a turbine inlet casing are presented, where the component was inspected subsequently during several years up to the point of substitution by a new one.
Abstract: In service inspection (ISI) of aged power plant parts has a delicate task to provide information on presence, position, orientation and size of defects in material. As far as results of ISI are just a starting point for elaborate procedure of life assessment or risk analyses, the accuracy and reliability of these results are particularly important. Time of Flight Diffraction (TOFD) technique is regarded as one of ultrasonic techniques capable to fulfil required precision, being approved in nowadays routine inspection of retaining rings or LP turbine rotor discs. Apart from these, usually highly automated inspections, a manual TOFD testing designed for particular plant component reveals reliable and useful defect information as well. In this work, results of TOFD inspection of turbine inlet casing are presented. The component was inspected subsequently during several years up to the point of substitution by a new one. Gained TOFD results are compared with results of visual and metallographic examination of samples cut out from the casing. Key words: NDT, power plant industry, castings, TOFD

2 citations

Patent
14 Aug 2013
TL;DR: In this article, the utility model discloses a time of flight diffraction (TOFD) scanning rack and a TOFD detection device, which consists of a first scanning rod and a second scanning rod which is rotationally connected with the first scanning rods through a connecting piece, so that the TOFD scanning rack can change the angle according to the needs.
Abstract: The embodiment of the utility model discloses a time of flight diffraction (TOFD) scanning rack and a TOFD detection device The TOFD scanning rack comprises a first scanning rod, and a second scanning rod which is rotationally connected with the first scanning rod through a connecting piece By adoption of the technical means that the TOFD scanning rack consists of the first scanning rod and the second scanning rod which is rotationally connected with the first scanning rod through the connecting piece, so that the TOFD scanning rack can change the angle according to the needs, a special workpiece can be detected, the detection range of a TOFD is greatly widened, and the production output is improved

2 citations

Journal ArticleDOI
01 Jan 2017
TL;DR: In this article, the authors describe the technologies and means of ultrasonic thickness measurement for pipeline base metal and welded joints using phased array antennas with linear scanning by TOFD and DAF methods.
Abstract: The article describes the technologies and means of ultrasonic thickness measurement for pipeline base metal and welded joints using phased array antennas with linear scanning by TOFD and DAF methods. According to the thickness measurement data provided through specialized software, maps are obtained of the control objects thickness. The measurement results are given using these technologies, as well as the prospects for these methods development.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202110
202017
201919
201823
201724
201624