|
COMPENDEX Answer Number 1 - © 1997 EI |
| Title |
| | Automatic detection of defects in industrial ultrasound images using a neural network. |
| Author |
| | Lawson, Shaun W. (Univ.of Surrey, Guildford Surrey, UK); Parker, Graham A. |
| Meeting Title |
| | Vision Systems: Applications. |
| Meeting Location |
| | Micropolis, Fr |
| Meeting Date |
| | 10 Jun 1996 |
| Meeting Title |
| | Vision Systems: Applications. |
| Organization |
| | SPIE - Int Soc for Opt Engineering, Bellingham, WA USA |
| Meeting Location |
| | Micropolis, Fr |
| Meeting Date |
| | 10 Jun 1996 |
| Publication Source |
| | Proceedings of SPIE - The International Society for Optical Engineering v 2786 1996..p 37-47
CODEN: PSISDG
ISBN: 0-8194-2172-3 |
| Publication Year |
| | 1996 |
| Meeting Number |
| | 22621 |
| Document Type |
| | Conference Article |
| Treatment Code |
| | Theoretical; Application |
| Language |
| | English |
| Abstract |
| | Time-of-flight diffraction (TOFD) is a relatively new method of ultrasonic inspection and is well suited to semi- automation using methods such as robotic scanning, computer conditioned data acquisition and signal and image enhancement.However very little work has been documented on the full computer understanding of such scans.Instead, most work has been directed at aiding the manual interpretation process to determine defect characteristics.This paper describes the application of image processing and neural networks (ANNs) to the task of completely automating the decision making process involved in the interpretation of TOFD scans.Local area analysis is used to derive a feature vector which contains 2D information on defect/component and non-defect areas.These vectors are then classified using an ANN trained with the backpropagation algorithm.The labelled image is then further segmented using binary shape analysis to discriminate between component echoes, or defect signals.Time-of-flight correction techniques may be then used in order to determine the location of defects within a scanned weld.15 Refs. |
| Accession Number |
| | 96(52):2054 |
| COMPENDEX Answer Number 4 - © 1997 EI |
| Title |
| | Flaw detection and sizing using advanced mechanized ultrasonic inspection systems. |
| Author |
| | Pizzey, Talman B. (Canspec Group Inc, Edmonton, Alberta, Can) |
| Meeting Title |
| | Proceedings of the 1996 82nd Annual Meeting of Technical Section Canadian Pulp and Paper Association.Part A. |
| Meeting Location |
| | Montreal, Can |
| Meeting Date |
| | 30 Jan 1996-31 Jan 1996 |
| Meeting Title |
| | Proceedings of the 1996 82nd Annual Meeting of Technical Section Canadian Pulp and Paper Association.Part A. |
| Meeting Location |
| | Montreal, Can |
| Meeting Date |
| | 30 Jan 1996-31 Jan 1996 |
| Publication Source |
| | Annual Meeting - Technical Section, Canadian Pulp and Paper Association, Preprints n Pt A 1996.Canadian Pulp & Paper Assoc, Montreal, Que, Can.p A35-A38
CODEN: PMCADQ ISSN: 0316-6732 |
| Publication Year |
| | 1996 |
| Meeting Number |
| | 44394 |
| Document Type |
| | Conference Article |
| Treatment Code |
| | Application; General Review |
| Language |
| | English |
| Abstract |
| | Ultrasonic techniques have proven very reliable for the detection and sizing of hydrogen induced cracks, stress corrosion cracks, manufacturing defects, and corrosion. Compared with other nondestructive testing (NDT) methods, ultrasonic techniques are more flexible with fewer limitations. Many equipment owners lack confidence in manual ultrasonics because there are no tangible results and the inspection method is considered operator sensitive. Imaging capabilities of mechanized ultrasonic systems provide a defect map that owners can understand. Mechanized systems also provide excellent repeatability. Multi-channel applications using focused probes, roller wheel probes, creep waves, time-of-flight diffraction (TOFD), and phased array techniques can be carried out in a timely and cost effective manner. This report describes various scanning techniques, imaging methods, and fitness for service implications associated with mechanized ultrasonic scanning.(Author abstract) |
| Accession Number |
| | 96(18):2894 |
| COMPENDEX Answer Number 5 - © 1997 EI |
| Title |
| | TOFD used to replace radiography. |
| Author |
| | Verkooijen, J. (AEA Sonomatic BV, Oosterhout, Neth) |
| Publication Source |
| | Insight - Non - Destructive Testing and Condition Monitoring v 37 n 6 Jun 1995.p 433-435
CODEN: ITMOEN ISSN: 1354-2575 |
| Publication Year |
| | 1995 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application; General Review |
| Language |
| | English |
| Abstract |
| | During the construction of a refinery in the Rotterdam area, AEA Sonomatic has used the ultrasonic Time-Of-Flight Diffraction (TOFD) technique on a large scale as an alternative to radiography. The use of the technique resulted in major cost savings and increased confidence in the end-product.(Author abstract) 5 Refs. |
| Accession Number |
| | 95(37):1133 |
| COMPENDEX Answer Number 6 - © 1997 EI |
| Title |
| | High-accuracy defect sizing for CRDM penetration adapters using the ultrasonic TOFD technique. |
| Author |
| | Atkinson, I. (AEA Technology, Risley, Engl) |
| Publication Source |
| | Insight - Non - Destructive Testing and Condition Monitoring v 37 n 3 Mar 1995.p 175-178
CODEN: ITMOEN ISSN: 1354-2575 |
| Publication Year |
| | 1995 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application |
| Language |
| | English |
| Abstract |
| | Ultrasonic time-of-flight diffraction (TOFD) is the preferred technique for critical sizing of throughwall orientated defects in a wide range of components, primarily because it is intrinsically more accurate than amplitude-based techniques.For the same reason, TOFD is the preferred technique for sizing the cracks in control rod drive mechanism (CRDM) penetration adapters, which have been the subject of much recent attention.Once the considerable problem of restricted access for the UT probes has been overcome, this inspection lends itself to very high accuracy defect sizing using TOFD. In qualification trials under industrial conditions, depth sizing to an accuracy of less than equivalent to 0.5 mm has been routinely achieved throughout the full wall thickness (16 mm) of the penetration adapters, using only a single probe pair and without recourse to signal processing.(Author abstract) |
| Accession Number |
| | 95(25):100 |
| COMPENDEX Answer Number 8 - © 1997 EI |
| Title |
| | Benefits of signal processing in ultrasonic inspection. |
| Author |
| | Silk, M.G. (Advanced NDT Research Group) |
| Publication Source |
| | Insight - Non - Destructive Testing and Condition Monitoring 36 10 Oct 1994.p 776-781
CODEN: 001599 |
| Publication Year |
| | 1994 |
| Document Type |
| | Journal |
| Treatment Code |
| | General Review; Theoretical |
| Language |
| | English |
| Abstract |
| | This paper describes a number of the benefits which signal processing techniques have brought to the analysis of ultrasonic data.In view of the steady growth in the use of the ultrasonic time of flight diffraction (TOFD) technique, many of the examples are taken from TOFD data.However, all of the processing techniques described are non-specific and could be applied to data obtained using either the pulse echo (PE) or TOFD techniques.Overall, to achieve these benefits from signal processing, there is a fundamental requirement to be able to store, analyze and compare more than one ultrasonic trace (A-scan).Thus the paper is concerned with what can be achieved by the use of digital ultrasonic systems, rather than with simple flaw detectors.(Author abstract) 10 Refs. |
| Accession Number |
| | 95(13):268 |
| COMPENDEX Answer Number 9 - © 1997 EI |
| Title |
| | Detection and sizing of defects in heavy wall pressure vessel welds. |
| Author |
| | Yokote, Y. (Japan Steel Works, Ltd, Muroran, Jpn); Ishizuka, T.; Tahara, T.; Bagdasarian, A.J.; Gougler, R.J.; Stellina, R.M. |
| Meeting Title |
| | Proceedings of the 1994 Pressure Vessels and Piping Conference. Part 7 (of 19). |
| Meeting Location |
| | Minneapolis, MN, USA |
| Meeting Date |
| | 19 Jun 1994-23 Jun 1994 |
| Meeting Title |
| | Proceedings of the 1994 Pressure Vessels and Piping Conference. Part 7 (of 19). |
| Organization |
| | ASME |
| Meeting Location |
| | Minneapolis, MN, USA |
| Meeting Date |
| | 19 Jun 1994-23 Jun 1994 |
| Publication Source |
| | Determining Material Characterization: Residual Stress and Integrity with NDE American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP v 276 1994. ASME, New York, NY, USA.p 125-132
CODEN: AMPPD5 ISSN: 0277-027X |
| Publication Year |
| | 1994 |
| Meeting Number |
| | 21114 |
| Document Type |
| | Conference Article |
| Treatment Code |
| | Application; General Review; Experimental |
| Language |
| | English |
| Abstract |
| | Several hydroprocessing reactors made of 2 1/4Cr-1Mo steel with double layer stainless steel weld overlay with thickness of approximately six inches (150 mm) were investigated for material property degradation and evaluation of defects.Several nondestructive examination techniques for field inspection were discussed including ultrasonic testing, Time of Flight Diffraction (TOFD) and radiographic examination.1 Refs. |
| Accession Number |
| | 95(4):7748 |
| COMPENDEX Answer Number 10 - © 1997 EI |
| Title |
| | Depth measurement of short cracks with an acoustic microscope. |
| Author |
| | Knauss, D. (Univ of Oxford, Oxford, UK); Bennink, D.D.; Zahi, T.; Briggs, G.A.D.; Martin, J.W. |
| Publication Source |
| | Journal of Materials Science v 28 n 18 Sep 15 1993.p 4910-4917
CODEN: JMTSAS ISSN: 0022-2461 |
| Publication Year |
| | 1993 |
| Document Type |
| | Journal |
| Treatment Code |
| | Experimental; Application |
| Language |
| | English |
| Abstract |
| | The depth of short cracks (70-200 mu m surface length) has been measured with an acoustic microscope by utilizing the nondestructive time-of-flight diffraction technique (TOFD).The depth measurements were first carried out in the transparent polymer polystyrene, thus allowing a comparison between the acoustical values and direct optical measurements: the agreement in the results was better than 95%.The depth of a 70 mu m long crack in an aluminum alloy was then measured, demonstrating the application of the technique to metals.(Author abstract) 18 Refs. |
| Accession Number |
| | 94(4):399 |
| COMPENDEX Answer Number 11 - © 1997 EI |
| Title |
| | Surface-breaking fatigue crack detection using laser ultrasound. |
| Author |
| | Shan, Q. (DIAS, Manchester, Engl); Dewhurst, R.J. |
| Publication Source |
| | Applied Physics Letters v 62 n 21 May 24 1993.p 2649-2651
CODEN: APPLAB ISSN: 0003-6951 |
| Publication Year |
| | 1993 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application; Theoretical; Experimental |
| Language |
| | English |
| Abstract |
| | A laser technique is presented for the assessment of the depth of a tight fatigue crack in a metal alloy. The study involved an analysis of ultrasonic interaction with a crack using a laser time-of-flight diffraction (TOFD) method. Investigations exploited the use of a confocal Fabry-Perot interferometer as the ultrasonic sensor. TOFD measurements proved to be feasible. Exploiting laser beams on the same surface as the fatigue crack, ultrasonic wave forms were characterized to show that there was a feature arising from the bottom tip of the fatigue crack. A signal forms the basis of crack size evaluation.13 Refs. |
| Accession Number |
| | 93(38):345 |
| COMPENDEX Answer Number 12 - © 1997 EI |
| Title |
| | In-line inspection using time-of-flight diffraction. |
| Author |
| | Lilley, J. (Sonomatic Ltd, Warrington, Engl); Osborne, P. |
| Publication Source |
| | Weld Met Fabr v 59 n 8 Oct 1991 3p
CODEN: WLMFAM ISSN: 0043-2245 |
| Publication Year |
| | 1991 |
| Document Type |
| | Journal |
| Treatment Code |
| | Experimental |
| Language |
| | English |
| Abstract |
| | The authors look at the potential of an alternative nondestructive examination technique, time-of-flight diffraction (TOFD), to replace the traditional methods of inspecting fabricated tubular components.The disadvantages of conventional ultrasonic and radiographic inspection are outlined, and the processes are compared with TOFD.(Edited author abstract) |
| Accession Number |
| | 92(2):21969 |
| COMPENDEX Answer Number 14 - © 1997 EI |
| Title |
| | Interpretation of TOFD data in the light of ASME XI and similar rules. |
| Author |
| | Silk, Maurice G. (Natl NDT Cent, Harwell, Engl) |
| Publication Source |
| | Br J Non Destr Test v 31 n 5 May 1989 p 242-251
CODEN: BJNTAS ISSN: 0007-1137 |
| Publication Year |
| | 1989 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application; General Review; Theoretical |
| Language |
| | English |
| Abstract |
| | The ASME XI rules provide a comprehensive set of criteria for the most serious, planar, defects however, and for this reason alone are likely to become increasingly used to aid the interpretation of ultrasonic data This paper considers implications of the ASME XI and other rules for the ultrasonic time-of-flight diffraction technique (TOFD) and defines its current limitations.In this appraisal it is implicitly assumed that the TOFD technique is used both to locate and size flaws and is applied in the manner currently possible on site using the ZIPSCAN(8) equipment. This review is primarily concerned with the potential application of rules akin to ASME XI to non-nuclear inspections.8 Refs. |
| Accession Number |
| | 90(1):5341 |
| COMPENDEX Answer Number 15 - © 1997 EI |
| Title |
| | Accuracy in locating a point scatterer in ultrasonic testing, using the TOFD technique. |
| Author |
| | Mak, D.K. (Physical Metallurgy Research Lab, Can) |
| Publication Source |
| | Br J Non Destr Test v 31 n 9 Sep 1989 p 481-484
CODEN: BJNTAS ISSN: 0007-1137 |
| Publication Year |
| | 1989 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application; Theoretical; Experimental |
| Language |
| | English |
| Abstract |
| | The equations for calculating the errors in locating a point defect in ultrasonic testing have been derived for two-dimensional as well as three-dimensional space.Experimental data have been collected. They illustrate what kind of error estimate is expected in positioning a point defect.This will yield a quantitative error estimate of flaw sizing.(Author abstract) 7 Refs. |
| Accession Number |
| | 90(1):2586 |
| COMPENDEX Answer Number 16 - © 1997 EI |
| Title |
| | Zipscan 3 and TOFD offer improved sizing accuracy. |
| Author |
| | Browne, Bill (Nuclear Engineering Int, Sutton, Engl) |
| Publication Source |
| | Nucl Eng Int v 34 n 423 Oct 1989 p 24-26
CODEN: NEINBF ISSN: 0029-5507 |
| Publication Year |
| | 1989 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application; General Review |
| Language |
| | English |
| Abstract |
| | Work carried out at EPRI and elsewhere has confirmed that time-of-flight diffraction (TOFD) techniques using Zipscan equipment provide very accurate defect sizing.Further improvements are embodied in the latest generation of equipment, Zipscan 3.This article reviews the design of Zipscan 3 and applications of this system.(Edited author abstract) |
| Accession Number |
| | 90(1):1559 |
| COMPENDEX Answer Number 17 - © 1997 EI |
| Title |
| | PISC II parametric study on flaw characterisation using the tandem and TOFD techniques. |
| Author |
| | Murgatroyd, R.A. (UKAEA, Warrington, Engl); Highmore, P.J.; Burch, S.F.; Bann, T.; Ramsey, A.T. |
| Meeting Title |
| | Papers Presented at the Fifth International Seminar on Non-Destructive Examination in Relation to Structural Integrity. |
| Meeting Location |
| | Davos, Switz |
| Meeting Date |
| | 26 Aug 1987-27 Aug 1987 |
| Meeting Title |
| | Papers Presented at the Fifth International Seminar on Non-Destructive Examination in Relation to Structural Integrity. |
| Meeting Location |
| | Davos, Switz |
| Meeting Date |
| | 26 Aug 1987-27 Aug 1987 |
| Publication Source |
| | International Journal of Pressure Vessels and Piping v 35 n 1-4 1988.p 137-169
CODEN: PRVPAS ISSN: 0308-0161 |
| Publication Year |
| | 1988 |
| Meeting Number |
| | 12070 |
| Document Type |
| | Journal |
| Treatment Code |
| | Experimental |
| Language |
| | English |
| Abstract |
| | Studies on the effect of flaw characteristics and selected inspection parameters on the detection and sizing of flaws in ferritic steel blocks have been performed by the United Kingdom Atomic Energy Authority (UKAEA) as part of a large Commission of the European Communities (CEC) Parametric Study program.The techniques included in the UKAEA studies were the 45 degree tandem and the time-of-flight diffraction (TOFD) techniques.The purpose of the work was to acquire reliable experimental data that could be used both to test and verify theoretical models and to contribute to the resolution of anomalies encountered in PISC round-robin inspection exercises.(Edited author abstract) 3 Refs. |
| Accession Number |
| | 89(3):35312 |
| COMPENDEX Answer Number 18 - © 1997 EI |
| Title |
| | SIZING OF DEFECTS IN STEEL CONSTRUCTIONS BY ULTRASOUND. |
| Author |
| | Terpstra, S. (Shell Research BV, Amsterdam, Neth) |
| Meeting Title |
| | Acoustical Imaging. Proceedings of the 14th International Symposium. |
| Meeting Location |
| | The Hague, Neth |
| Meeting Date |
| | 22 Apr 1985-25 Apr 1985 |
| Meeting Title |
| | Acoustical Imaging. Proceedings of the 14th International Symposium. |
| Meeting Location |
| | The Hague, Neth |
| Meeting Date |
| | 22 Apr 1985-25 Apr 1985 |
| Publication Source |
| | Acoustical Imaging: Proceedings of the International Symposium v 14.Publ by Plenum Press, New York, NY, USA p 769
CODEN: ACIGD9 ISSN: 0270-5117
ISBN: 0-306-42094-5 |
| Publication Year |
| | 1985 |
| Meeting Number |
| | 10786 |
| Document Type |
| | Conference Article |
| Language |
| | English |
| Abstract |
| | The following techniques will be presented: time of flight diffraction (TOFD) and (focussing techniques).In the first the arrival time of forwardly diffracted longitudinal waves is used to determine the depth of the defect edge.Equipment has been developed for field application of TOFD.In focussing techniques an image of the defect is obtained by means of transversal waves which are back-reflected from its surface and edges.(Edited author abstract) |
| Accession Number |
| | 88(4):61096 |
| COMPENDEX Answer Number 19 - © 1997 EI |
| Title |
| | SIZING WELD DEFECTS IN SUB-SEA STRUCTURES USING THE HARWELL ULTRASONIC TOFD TECHNIQUE. |
| Author |
| | Hawker, B.M. (UKAEA, Harwell, Engl) |
| Meeting Title |
| | IRM/AODC Conference, 5th Offshore Inspection Repairs and Maintenance Conference. |
| Meeting Location |
| | Aberdeen, Scotl |
| Meeting Date |
| | 05 Nov 1984-06 Nov 1984 |
| Meeting Title |
| | IRM/AODC Conference, 5th Offshore Inspection Repairs and Maintenance Conference. |
| Organization |
| | Offshore Conferences & Exhibitions Ltd, Kingston upon Thames, Engl; Spearhead Exhibitions Ltd, Kingston upon Thames, Engl |
| Meeting Location |
| | Aberdeen, Scotl |
| Meeting Date |
| | 05 Nov 1984-06 Nov 1984 |
| Publication Source |
| | v 2.Publ by Offshore Conferences & Exhibitions Ltd, Kingston upon Thames, Engl 16p |
| Publication Year |
| | 1984 |
| Meeting Number |
| | 10006 |
| Document Type |
| | Conference Article |
| Language |
| | English |
| Abstract |
| | The Ultrasonic 'Time-of-Flight' Diffraction Technique has been developed for the detection and sizing of defects in metal structures.Its potential for the inspection of thick steel sections has already been demonstrated in the context of reactor pressure vessels and other geometries.The author describes the details of the technique and the instrumentation which is required for both the collection of inspection data and for subsequently analyzing it.The paper also includes a discussion of the application of the technique to sub-sea steel structures, its advantages over other techniques, and the special considerations related to its use by divers.(Edited author abstract) 12 refs. |
| Accession Number |
| | 87(12):203662 |
| COMPENDEX Answer Number 20 - © 1997 EI |
| Title |
| | CUT THE COST OF INSPECTING HOT-REHEAT STEAM LINES. |
| Author |
| | Reason, John (Power, New York, NY, USA) |
| Publication Source |
| | Power v 131 n 6 Jun 1987 p 77-80
CODEN: POWEAD ISSN: 0032-5929 |
| Publication Year |
| | 1987 |
| Document Type |
| | Journal |
| Treatment Code |
| | Application; Economic Aspects |
| Language |
| | English |
| Abstract |
| | Existing ultrasonic methods of testing for cracks are time consuming and expensive.But techniques are being developed to cut costs and increase confidence and repeatability.The new flaw detection technique known as time-of-flight detection (TOFD), which involves a single automated scan of the weld with one sheer wave and saves much time is described.Recent application of this technique to inspect a reheat-piping weld is reported.Acoustic emission monitoring as a method of detecting defects in hot-reheat steam line under load is also described.A similar system of acoustic sensors attached to a waveguide on the pipe wall can also be used to detect steam leaks. |
| Accession Number |
| | 87(9):139336 |
| COMPENDEX Answer Number 22 - © 1997 EI |
| Title |
| | RESEARCH INTO NEW METHODS FOR DETECTION AND SIZING OF DEFECTS IN SUBSEA STEEL CONSTRUCTIONS. |
| Author |
| | Newton, K. (UKAEA, Harwell, Engl); Wein, A.P.; Hawker, B.M. |
| Meeting Title |
| | Underwater Technology Conference-86: Deep Water Technology, Proceedings of the International Conference. |
| Meeting Location |
| | Bergen, Norw |
| Meeting Date |
| | 14 Apr 1986-16 Apr 1986 |
| Meeting Title |
| | Underwater Technology Conference-86: Deep Water Technology, Proceedings of the International Conference. |
| Organization |
| | Norwegian Petroleum Soc, Bergen, Norw |
| Meeting Location |
| | Bergen, Norw |
| Meeting Date |
| | 14 Apr 1986-16 Apr 1986 |
| Publication Source |
| | Publ by Norsk Petroleumsforening, Bergen, Norw p 89-111
ISBN: 82-991134-1-5 |
| Publication Year |
| | 1986 |
| Meeting Number |
| | 09634 |
| Document Type |
| | Conference Article |
| Language |
| | English |
| Abstract |
| | While several methods are available for the detection of defects during fabrication or in-service inspection, underwater detection of defects is mainly performed by divers using visual inspection or MPI.There are fewer methods for assessment of defect depth (e.g.A.C. Potential Drop and ultrasonics) and conventional ultrasonic methods are based on signal amplitudes which can lead to inaccurate sizing. The first program development of the ultrasonic Time-of-Flight Diffraction (TOFD) technique for use by divers to size defects in sub-sea welds, has recently been completed and is described in detail.The results of laboratory validation and diver trials of a complete prototype system both in a test tank and in open seawater are presented.Work required to enable early use of the technique in the North sea is discussed.(Edited author abstract) 19 refs. |
| Accession Number |
| | 87(6):98047 |
| COMPENDEX Answer Number 23 - © 1997 EI |
| Title |
| | NUCLEAR NDT DEVELOPMENT AT HARWELL. |
| Author |
| | Collingwood, J.C. |
| Publication Source |
| | NDT Int v 20 n 1 Feb 1987 p 33-41
CODEN: NDITDS ISSN: 0308-9126 |
| Publication Year |
| | 1987 |
| Document Type |
| | Journal |
| Treatment Code |
| | General Review; Experimental |
| Language |
| | English |
| Abstract |
| | A review is presented of nuclear-oriented NDT development work at Harwell, illustrating the synergy between this and the National NDT Centre's non-nuclear program.Most of the work in recent years has been concerned with automated ultrasonic inspection techniques for the proposed Sizewell 'B' PWR pressure vessel, and Harwell's part has been to develop the time-of-flight diffraction method (TOFD) as a stand-alone technique for defect detection and sizing.The value of this technique, which originated in the Centre's non-nuclear work, has been amply demonstrated in trials involving thick plate weld and nozzle specimens.Currently, the main item in the nuclear program is the improvement of ultrasonic inspection capability for austenitic castings and welds, for both PWR and fast reactor applications, by means of advanced scanning and signal processing techniques.(Edited author abstract) 34 refs. |
| Accession Number |
| | 87(6):91081 |
| COMPENDEX Answer Number 25 - © 1997 EI |
| Title |
| | SIZING DEFECTS IN COMPLEX GEOMETRIES UNDERWATER BY ULTRASONIC TOFD. |
| Author |
| | Hawker, B.M. (Offshore Technology Cent, Harwell, Engl); Newton, K.; Wein, A.P. |
| Meeting Title |
| | NDT-85, Proceedings of the 20th Annual British Conference on Non-Destructive Testing. |
| Meeting Location |
| | Erskine, Scotl |
| Meeting Date |
| | 17 Sep 1985-19 Sep 1985 |
| Meeting Title |
| | NDT-85, Proceedings of the 20th Annual British Conference on Non-Destructive Testing. |
| Organization |
| | British Inst of Non-Destructive Testing |
| Meeting Location |
| | Erskine, Scotl |
| Meeting Date |
| | 17 Sep 1985-19 Sep 1985 |
| Publication Source |
| | Publ by Engineering Materials Advisory Services Ltd, Warley, Engl p 171-185
ISBN: 0-947817-10-7 |
| Publication Year |
| | 1986 |
| Meeting Number |
| | 08944 |
| Document Type |
| | Conference Article |
| Language |
| | English |
| Abstract |
| | A multi-client sponsored development programme, to adapt the Harwell Ultrasonic Time-of-Flight Diffraction (TOFD) Technique for use by a diver on sub-sea welds, is approaching completion.The technique is described and results are given of trials in the laboratory and in a diver training tank.The merits and limitations of the technique for use underwater are discussed.(Edited author abstract) 8 refs. |
| Accession Number |
| | 87(2):31745 |
| COMPENDEX Answer Number 27 - © 1997 EI |
| Title |
| | EFFECT OF STRESS ON THE TRANSMISSION OF ULTRASOUND THROUGH FATIGUE CRACKS. |
| Author |
| | Whapham, A.D. (AERE, Harwell, Engl); Perring, S.; Rusbridge, K.L. |
| Meeting Title |
| | Proceedings - 7th International Conference on NDE in the Nuclear Industry. |
| Meeting Location |
| | Grenoble, Fr |
| Meeting Date |
| | 28 Jan 1985-01 Feb 1985 |
| Meeting Title |
| | Proceedings - 7th International Conference on NDE in the Nuclear Industry. |
| Organization |
| | ASM, Metals Park, OH, USA |
| Meeting Location |
| | Grenoble, Fr |
| Meeting Date |
| | 28 Jan 1985-01 Feb 1985 |
| Publication Source |
| | p 389-392 |
| Publication Year |
| | 1985 |
| Meeting Number |
| | 07759 |
| Document Type |
| | Conference Article |
| Language |
| | English |
| Abstract |
| | The effect of crack closure on the ultrasonic signals from tight fatigue cracks in steel, has been investigated in the time of flight diffraction (TOFD) geometry.On unloading, the cracks closed, but even with a closing load applied, the signals were adequate for defect detection.The TOFD technique sizes defects independently of signal amplitude, and characteristic features of the images could be used to positively identify an unknown defect as a tight fatigue crack.The observed signals agree with theory.(Author abstract) 11 refs. |
| Accession Number |
| | 86(8):126570 |
| COMPENDEX Answer Number 28 - © 1997 EI |
| Title |
| | INSPECTION OF PWR PRESSURE VESSEL GEOMETRIES BY THE ULTRASONIC DIFFRACTION TECHNIQUE. |
| Author |
| | Stringfellow, M.W. (AERE, Harwell, Engl); Perring, J.K. |
| Meeting Title |
| | Proceedings - 7th International Conference on NDE in the Nuclear Industry. |
| Meeting Location |
| | Grenoble, Fr |
| Meeting Date |
| | 28 Jan 1985-01 Feb 1985 |
| Meeting Title |
| | Proceedings - 7th International Conference on NDE in the Nuclear Industry. |
| Organization |
| | ASM, Metals Park, OH, USA |
| Meeting Location |
| | Grenoble, Fr |
| Meeting Date |
| | 28 Jan 1985-01 Feb 1985 |
| Publication Source |
| | p 43-46 |
| Publication Year |
| | 1985 |
| Meeting Number |
| | 07759 |
| Document Type |
| | Conference Article |
| Language |
| | English |
| Abstract |
| | Scanners using the ultrasonic time-of-flight diffraction (TOFD) technique have been developed for automated inspection of the nozzle inner radius and nozzle-vessel weld of the PWR.When compared with destructive examination data the results obtained from an inner radius test block containing implanted defects show that the through-thickness height of underclad cracks can be determined to an accuracy of 2.5 mm.Results of similar quality are expected for the sizing of defects in the nozzle-vessel weld.(Author abstract) 5 refs. |
| Accession Number |
| | 86(8):126482 |
| COMPENDEX Answer Number 29 - © 1997 EI |
| Title |
| | MODERN TECHNIQUES IN NON-DESTRUCTIVE TESTING. |
| Author |
| | Hudson, B. (AERE, Harewell, Engl) |
| Publication Source |
| | Met Mater (Inst Met) v 1 n 2 Feb 1985 p 88-90
CODEN: MMIMEQ |
| Publication Year |
| | 1985 |
| Document Type |
| | Journal |
| Treatment Code |
| | General Review |
| Language |
| | English |
| Abstract |
| | Non-destructive testing has matured and expanded from its classic role of a quality control procedure into a monitoring tool for materials and plant.Even the name of the discipline is often changed to non-destructive examination or non-destructive evaluation (NDE).These changes in nomenclature represent attempts to convey that, in addition to searching for and identifying defects in a material, the capability exists for interrogating components and analyzing the return signals so as to reveal many details of their intrinsic structure or condition.There has been a long-term input into all aspects of NDE and instrument development at Harwell, and this article is a summary of several new developments in the field. (Author abstract) 12 refs. |
| Accession Number |
| | 86(7):100583 |
