Results 11 to 20 of about 591 (186)
CIVA Confirmation of Frequency Dependence of TOFD Lateral Wave
e-Journal of Nondestructive TestingPulse-duration (ring-time) of the TOFD (Time of Flight Diffraction) lateral wave has been assumed to be based on the nominal frequency of the probe. With the improved damping used for TOFD applications, these probes now have had their ring-time reduced ...
Edward Ginzel, Edward Ginzel
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CIVA as an Aid to Understanding TOFD Dead Zones
e-Journal of Nondestructive TestingTOFD (Time of Flight Diffraction) has been a popular ultrasonic testing method for many years. It has associated with it, limitations associated with the pulse duration.
Edward Ginzel
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Revista EIA, 2012 This paper shows how the symbiosis of two disciplines, software engineering and ultrasonic techniques, made possible the development of a nondestructive testing system for TOFD imaging, and it also allowed to make the application of commercial ...
Darío Segura, Alejandro Rodríguez
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Immersion and TOFD (I-TOFD): A Novel Combination for Examination of Lower Thicknesses
Journal of Nondestructive Evaluation, 2011 Time 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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Using phase relationships in non-symmetric ToFD configurations
e-Journal of Nondestructive Testing, 2023 In conventional ToFD, operators are taught that diffracted echoes from the top and bottom of a planar defect have opposite phase and such defects can thus be discriminated from a pair of slag lines.
Thomas Joseph Bloodworth +1 more
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Recent modelling advances for ultrasonic TOFD inspections
AIP Conference Proceedings, 2015 The ultrasonic TOFD (Time of Flight Diffraction) Technique is commonly used to detect and characterize disoriented cracks using their edge diffraction echoes. An overview of the models integrated in the CIVA software platform and devoted to TOFD simulation is presented.
Darmon, Michel +4 more
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Untersuchungen mit TOFD an geschweißten Längsnahtproben
Materials Testing, 2000 Weld 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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AIP Conference Proceedings, 2011 A time domain spectrometer in the range of 0.5–2 THz was used for time of flight (ToF) measurements of THz pulses for imperfection detection in non metallic materials. The measurements were performed in comparison to the established ultra sound pulse echo (PE) and time of flight diffraction (ToFD) technique.
U. Ewert +6 more
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Chinese Journal of Mechanical Engineering, 2022 The shallow subsurface defects are difficult to be identified and quantified by ultrasonic time-of-flight diffraction (TOFD) due to the low resolution induced by pulse width and beam spreading.
Xu Sun, Li Lin, Shijie Jin
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Nuclear Engineering and Technology, 2017 During the fabrication process of reactor vessel head penetration (RVHP), the grain size of the tube material can be changed by hot or cold work and the inner side of the tube can also be shrunk due to welding outside of the tube. Several nonregular time-
Kyungcho Kim +5 more
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