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Acoustic emission from weld-seam of 16MnR steel during stress corrosion
N DT Abstracts 43979
Murray, S.H.
cannot be determined with AE. The use of AE at various stages of the process, in a number of welding techniques is described. Some evaluation instruments are described, and sound sources and interference noise discussed.
Computed tomography used in weld inspections at NASA Welding Journal, Vol. 69, No. 2, pp. 33-39 (Feb. 1990) As a technique, computed tomography (CT) has may applications. This Paper describes how the valuable nondestructive evaluation (NDE) tool was used to inspect welds on critical ground support equipment for the space shuttle at the Kennedy Space Center, as other NDE techniques proved unsuccessful. Some welded-end hydraulic accumulators were thought to contain fatigue cracks, which lmight lead to high-velocity or high-volume leakage of hydraulic fluids. CT. was successfully used to identify three levels of fatigue defects. 43545
42767
European Patent No. 163,556 (18 Oct. 1989) 42761
Takahashi, H.; Jeong, H.D.; Murakami, Y.
42706
Terry, P.B.
An optical automated weld profile monitor PHD thesis, Department of Electrical Engineering and Electronics, University of Liverpool, U.K., 35Opp. (Nov. 1987) The thesis gives a summary of NDT methods commonly used at present including visual inspection. It shows that it would be of great benefit if this process could be automated. The design and development of a fully automated visual inspection method forms the main part of this thesis. The text describes a method for automating the most commonly used NDT test (that of visual inspection) to allow accurate and rapid data extraction/interpretation. A prototype system is demonstrated which will perform the visual inspection of topside/underside weld profiles, detecting weld defects as outlined by BS4870:Part 1. To perform data interpretation from logged profile data an Expert System has been written, the output of this system is shown with respect to the measure of standard weld defects.
43297 Anon. In-process acoustic emisslion monitoring of dissimilar metal welding Electric Power Research Institute, Palo Alto, California, (United States), EPRI-NP-6508-M, 28pp. (Aug. 1989) A new acoustic emission weld monitoring system-involving real-time, in- process acoustic emissiasn monitoring-has been developed and demonstrated to be reliable in detecting and locating flaws in critical bimetallic welds. The system could provide inspection of critical welds in cases where conventional nondestructive evaluation would be costly or impossible to apply. Ho, S.K.; White, RN.; Lucas, .I.
42527
A vision system for automated crack detection in welds
Musiychenko, V.F.; Zhd.anov, S.L.
Using the acoustic emission method for examining the process of formation of cold cracks in welded joints in a high-strength steel
Measurement Science and Technology, Vol. 1, No. 3, p. 287 (Mar. 1990) This paper describes the development of a vision-based system for automated inspection of surface cracks in materials. The magnetic particle inspection method is used to reveal cracks in ferromagnetic materials. The vision system consists of an IBM AT compatible computer, a framestore and a camera. Details of the preparation procedure and the software algorithms for crack recognition have been discussed. Results have been presented for transverse and longitudinal cracks in welds used to fabricate structures.
Technical Translations, 7 Meadow Walk, Great Abington, Cambridge, U.K., 7pp. (1984), No. VR/3852 Cold cracks found in welded joints in high strength steels can be examined using a new acoustic emission (AE) device described here. These cracks are formed in three stages. Only the final stage, during which macrocracks are formed by the merger of submicrocracks, is examined here, by recording the AE signals from the sudden release of elastic energy during the propagation of a microcrack. A device is described which measures the coordinates of such AE sources. This method is shown to be successful and will permit more effective inspection of welded joints in high strength steels.
Buchmayr, B.; Cerjak, H.; Galan, P.
Application of acoustic emission analysis to the determination of cold and hot crack form,ation during welding Acoustic Emission, Edited by J. Eisenblatter; pp. 149-156. Pub]. DGM Informationsgesellschaft, Verlag, 321 pp. (1988) ISBN 3883551317 Acoustic emission analysis (AEA) allows crack formation to be detected during the welding process, The method described here distinguishes between acoustic emission from real crack signals and from other sources like phase transformations, plastic deformation etc. This study aims to determine the range of sensitivity of AEA using cold and hot crack sensitive materials welded using a PVF! (programmierter verformungsri beta or program controlled deformation, cracking test). Cold cracks were readily detected, but hot cracks were less straightforward. Other indicators were more reliable at high temperatunzs and further tests were necessary. 43014
by
British Patent No. 2,213,598 (16 Aug. 1989) A non-destructive method of testing a weld made by pressure welding two metal parts at forging temperature wherein after heating to a temperature of about 1lOOC and applying a forging pressure, a traction stress is applied while still hot, perpendicularly to the junction plane between the two ducts while the temperature is about 6OOC, in order to enlarge any defects present at the junction surface and thus make them detectable by a conventional detect testing system.
Nondestructive Evaluation: NDE Planning and Application, The 1989 ASME Pressure Vessels and Piping Conference, Honolulu, (United States), 23- 27 Jul. 1989. pp. 107-l 12. Edited by R.D. Streit. The American Societ,y of Mechanical Engineers The aim of this paper is to apply the acoustic emission technique as the on-line evaluation method to pressure vessel integrity assessment. Hydrostatic tests, AE measurement and ultrasonic inspection have been achieved for pressure vessels having the weld flaw. AE frequency analysis was simultaneously carried out using the high speed frequency analyzer system.
43016
Leroux, J.
A non-destructive method of testing a weld obtained pressure welding two metal parts
On-line evaluation procedure for structural integrity by acoustic emission frequency analysis - weld defect containing pressure vessel
4323 1
Vallourec
Selective detection system for inspection of welds has ultrasonic detectors orientated to sense faults in transverse and axial directions during sweep operation
423 17
Mitsubishi Jukogyo
Ultrasonic crack location apparatus for tube weld inspection -includes sequential connection of probes with slip ring for signal transmission and rotary and axlal drives European Patent No. 3 14,017 (9 Jun. 1984) 41890
Zhang, B.Q.; Sun, J.Q.
Acoustic emission from weld-seam of 16MnR steel during stress corrosion Journal of Acoustic Emission, Vol. 8, Nos. 1-2, pp. 5 114-5 117 (Jan. - Jun. 1989). Special Supplement - Extended Summaries of papers to be presented at the World Meeting on Acoustic Emission, Charlotte, North Carolina, USA, 20-23 Mar. 1989 Acoustic Emission (AE) monitoring was performed during stress corrosion cracking (SCC) for weld-seams of 16MnR steel by use of computed tomography (CT) specimens under slow strain rate. AE parameters included: event counts, count rate, total energy, total counts. Mechanical parameters crosshead displacement and load were. recorded and analyzed. AE waveforms in the time domain were recorded and frequency spectrums analyzed in-situ using a microcomputer. The effects of different crack plane orientations to AE characterizations were analyzed too. During the SCC process the weld-seam region has more abundant AE signals in comparison to its parent 16MnR steel.
Crostack, H-A.; Storp, H-J.
Acoustic emission analysis - an integral method for process control during welding Acoustic Emission, Edited by J. Eisenblatter; pp. 119-148. Pub]. DGM Informationsgesellschaft, Verlag, 321~~. (1988) ISBN 3883551317 The inspection of components during welding can he undertaken using acoustic emission tests (AE) in contrast to other nondestructive methods which can only be used after the welding is completed. AE also allows a large area of the component to be inspected at one time. Flaws can be corrected as they are detected, i.e. during welding. Quality control during the cooling phase is possible however exact flaw geometry and nature
129
Murray, S.H.
cannot be determined with AE. The use of AE at various stages of the process, in a number of welding techniques is described. Some evaluation instruments are described, and sound sources and interference noise discussed.
Computed tomography used in weld inspections at NASA Welding Journal, Vol. 69, No. 2, pp. 33-39 (Feb. 1990) As a technique, computed tomography (CT) has may applications. This Paper describes how the valuable nondestructive evaluation (NDE) tool was used to inspect welds on critical ground support equipment for the space shuttle at the Kennedy Space Center, as other NDE techniques proved unsuccessful. Some welded-end hydraulic accumulators were thought to contain fatigue cracks, which lmight lead to high-velocity or high-volume leakage of hydraulic fluids. CT. was successfully used to identify three levels of fatigue defects. 43545
42767
European Patent No. 163,556 (18 Oct. 1989) 42761
Takahashi, H.; Jeong, H.D.; Murakami, Y.
42706
Terry, P.B.
An optical automated weld profile monitor PHD thesis, Department of Electrical Engineering and Electronics, University of Liverpool, U.K., 35Opp. (Nov. 1987) The thesis gives a summary of NDT methods commonly used at present including visual inspection. It shows that it would be of great benefit if this process could be automated. The design and development of a fully automated visual inspection method forms the main part of this thesis. The text describes a method for automating the most commonly used NDT test (that of visual inspection) to allow accurate and rapid data extraction/interpretation. A prototype system is demonstrated which will perform the visual inspection of topside/underside weld profiles, detecting weld defects as outlined by BS4870:Part 1. To perform data interpretation from logged profile data an Expert System has been written, the output of this system is shown with respect to the measure of standard weld defects.
43297 Anon. In-process acoustic emisslion monitoring of dissimilar metal welding Electric Power Research Institute, Palo Alto, California, (United States), EPRI-NP-6508-M, 28pp. (Aug. 1989) A new acoustic emission weld monitoring system-involving real-time, in- process acoustic emissiasn monitoring-has been developed and demonstrated to be reliable in detecting and locating flaws in critical bimetallic welds. The system could provide inspection of critical welds in cases where conventional nondestructive evaluation would be costly or impossible to apply. Ho, S.K.; White, RN.; Lucas, .I.
42527
A vision system for automated crack detection in welds
Musiychenko, V.F.; Zhd.anov, S.L.
Using the acoustic emission method for examining the process of formation of cold cracks in welded joints in a high-strength steel
Measurement Science and Technology, Vol. 1, No. 3, p. 287 (Mar. 1990) This paper describes the development of a vision-based system for automated inspection of surface cracks in materials. The magnetic particle inspection method is used to reveal cracks in ferromagnetic materials. The vision system consists of an IBM AT compatible computer, a framestore and a camera. Details of the preparation procedure and the software algorithms for crack recognition have been discussed. Results have been presented for transverse and longitudinal cracks in welds used to fabricate structures.
Technical Translations, 7 Meadow Walk, Great Abington, Cambridge, U.K., 7pp. (1984), No. VR/3852 Cold cracks found in welded joints in high strength steels can be examined using a new acoustic emission (AE) device described here. These cracks are formed in three stages. Only the final stage, during which macrocracks are formed by the merger of submicrocracks, is examined here, by recording the AE signals from the sudden release of elastic energy during the propagation of a microcrack. A device is described which measures the coordinates of such AE sources. This method is shown to be successful and will permit more effective inspection of welded joints in high strength steels.
Buchmayr, B.; Cerjak, H.; Galan, P.
Application of acoustic emission analysis to the determination of cold and hot crack form,ation during welding Acoustic Emission, Edited by J. Eisenblatter; pp. 149-156. Pub]. DGM Informationsgesellschaft, Verlag, 321 pp. (1988) ISBN 3883551317 Acoustic emission analysis (AEA) allows crack formation to be detected during the welding process, The method described here distinguishes between acoustic emission from real crack signals and from other sources like phase transformations, plastic deformation etc. This study aims to determine the range of sensitivity of AEA using cold and hot crack sensitive materials welded using a PVF! (programmierter verformungsri beta or program controlled deformation, cracking test). Cold cracks were readily detected, but hot cracks were less straightforward. Other indicators were more reliable at high temperatunzs and further tests were necessary. 43014
by
British Patent No. 2,213,598 (16 Aug. 1989) A non-destructive method of testing a weld made by pressure welding two metal parts at forging temperature wherein after heating to a temperature of about 1lOOC and applying a forging pressure, a traction stress is applied while still hot, perpendicularly to the junction plane between the two ducts while the temperature is about 6OOC, in order to enlarge any defects present at the junction surface and thus make them detectable by a conventional detect testing system.
Nondestructive Evaluation: NDE Planning and Application, The 1989 ASME Pressure Vessels and Piping Conference, Honolulu, (United States), 23- 27 Jul. 1989. pp. 107-l 12. Edited by R.D. Streit. The American Societ,y of Mechanical Engineers The aim of this paper is to apply the acoustic emission technique as the on-line evaluation method to pressure vessel integrity assessment. Hydrostatic tests, AE measurement and ultrasonic inspection have been achieved for pressure vessels having the weld flaw. AE frequency analysis was simultaneously carried out using the high speed frequency analyzer system.
43016
Leroux, J.
A non-destructive method of testing a weld obtained pressure welding two metal parts
On-line evaluation procedure for structural integrity by acoustic emission frequency analysis - weld defect containing pressure vessel
4323 1
Vallourec
Selective detection system for inspection of welds has ultrasonic detectors orientated to sense faults in transverse and axial directions during sweep operation
423 17
Mitsubishi Jukogyo
Ultrasonic crack location apparatus for tube weld inspection -includes sequential connection of probes with slip ring for signal transmission and rotary and axlal drives European Patent No. 3 14,017 (9 Jun. 1984) 41890
Zhang, B.Q.; Sun, J.Q.
Acoustic emission from weld-seam of 16MnR steel during stress corrosion Journal of Acoustic Emission, Vol. 8, Nos. 1-2, pp. 5 114-5 117 (Jan. - Jun. 1989). Special Supplement - Extended Summaries of papers to be presented at the World Meeting on Acoustic Emission, Charlotte, North Carolina, USA, 20-23 Mar. 1989 Acoustic Emission (AE) monitoring was performed during stress corrosion cracking (SCC) for weld-seams of 16MnR steel by use of computed tomography (CT) specimens under slow strain rate. AE parameters included: event counts, count rate, total energy, total counts. Mechanical parameters crosshead displacement and load were. recorded and analyzed. AE waveforms in the time domain were recorded and frequency spectrums analyzed in-situ using a microcomputer. The effects of different crack plane orientations to AE characterizations were analyzed too. During the SCC process the weld-seam region has more abundant AE signals in comparison to its parent 16MnR steel.
Crostack, H-A.; Storp, H-J.
Acoustic emission analysis - an integral method for process control during welding Acoustic Emission, Edited by J. Eisenblatter; pp. 119-148. Pub]. DGM Informationsgesellschaft, Verlag, 321~~. (1988) ISBN 3883551317 The inspection of components during welding can he undertaken using acoustic emission tests (AE) in contrast to other nondestructive methods which can only be used after the welding is completed. AE also allows a large area of the component to be inspected at one time. Flaws can be corrected as they are detected, i.e. during welding. Quality control during the cooling phase is possible however exact flaw geometry and nature
129