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Applicability and applications of alternative TOFD techniques
UltrasonicsUltrasonic time-of-flight diffraction (TOFD) technique is applied to non-destructive testing in engineering, but the dead zone influences its applicable range. Alternative TOFD techniques adopt the indirect diffracted waves having long propagation times to decouple from the lateral wave and detect near-surface defects.
Shijie, Jin +4 more
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TOFD Echo Signal Processing to Achieve Superresolution
Russian Journal of Nondestructive Testing, 2021It is proposed to use the method of maximum entropy (ME) and the method for constructing the AR model of the TOFD echo spectrum together with the method of splitting the spectrum to increase its resolution and, consequently, information content. The effectiveness of the approach proposed is demonstrated in model experiments. As a result, the resolution
E. G. Bazulin
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High-Frequency Filtering of Wedge Materials for TOFD
Materials Evaluation, 2023This article addresses the question: What effects do different types of wedge materials have, if any, on frequency filtering in high-frequency time of flight diffraction scanning?
J. Ellis
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Immersion and TOFD (I-TOFD): A Novel Combination for Examination of Lower Thicknesses
Journal of Nondestructive Evaluation, 2011Time of flight diffraction (TOFD) is a well-developed ultrasonic non-destructive testing (NDT) technique which has been applied successfully for accurate sizing of defects in thick sections. Codes of practice such as ASME now permit TOFD for routine examination as an alternative to radiography for thick weldments.
R. Subbaratnam +3 more
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Research on the Wall-Climbing Robot of TOFD Inspection for Welding Seam of Spherical Tank
International Conference on Robotics, Intelligent Control and Artificial Intelligence, 2023Spherical tank is a kind of steel pressure vessel, widely used in petroleum, liquefied natural gas and other material storage, its body is composed of a plurality of spherical shell plate after welding, and the welding quality of the spherical shell ...
Xingji Du +4 more
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Research on ultrasonic TOFD scanning image weld defect detection method based on PyTorch
International Conference on Signal Processing and Computer Science, 2023In order to overcome the shortcomings of low efficiency and subjective factors in manually analyzing and evaluating weld defect images obtained by the ultrasonic TOFD method.
Yu Chen +4 more
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Untersuchungen mit TOFD an geschweißten Längsnahtproben
Materials Testing, 2000Weld examination on Tube Test Specimen using TOFD. In contrast to the pulse echo technique, which is based on the sound field reflection at the flaw surface, the Time of Flight Diffraction (TOFD) technique uses the diffraction of the sound field at the flaw tips.
Gerhard Brekow, Anton Erhard
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TOFD Image Features Recognition Based on Improved YOLOv8
2024 IEEE 19th Conference on Industrial Electronics and Applications (ICIEA)TOFD detection is critical to weld quality. TOFD image evaluation is highly labour-intensive, with low efficiency and unstable quality. In order to realize the intelligent recognition of TOFD image features, this study first introduced a self-adaptive ...
Xukai Ren +4 more
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2023 IEEE 3rd International Conference on Electronic Communications, Internet of Things and Big Data (ICEIB), 2023
We innovatively applied neural network technology to the field of non-destructive testing of steel pipelines. According to the survey, there has been a serious gap in the development of intelligence and automation in the field of non-destructive testing ...
Wenmeng Wang, Congyao Wu
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We innovatively applied neural network technology to the field of non-destructive testing of steel pipelines. According to the survey, there has been a serious gap in the development of intelligence and automation in the field of non-destructive testing ...
Wenmeng Wang, Congyao Wu
semanticscholar +1 more source