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Criterial expert system for magnetic nondestructive inspection of the quality of welded joints
N DT Abstracts 55046
Chih-Kuo, F.
54108
Acoustic emission from cracking in a weldment subjected to non-uniform residual stresses Dissertation Abstracts International, Vol. 54, No. 7, pp. 3810-B3811-B (Jan. 1994) (DA 9332053) The acoustic emission generated from a cracking source in a weldment has been investigated theoretically and experimentally. In the theoretical analysis, a general analytical expression for the relationship between acoustic emission surface motion and crack opening displacement was derived based on the analogy of earthquake problems in seismology and crack opening in fracture mechanics. In the experimental investigation. acoustic emission signals have been recorded and analyzed during and after gas metal arc welding. In addition to the study of cold cracking of a weldment in air, hydrogen embrittlement was induced using the electrochemical method to cathodically charge weldments with hydrogen in order to accelerate cold cracking.
Proceedings of the 41st Annual Welding Conference and National AINDT Conference, Wollongong (Australia), 27 Sep.-l Oct. 1993. pp. 70-73. WTIA, AINDT (1993) ISBN O-86418-265-1 A weld in an aluminium plate has been inspected by the normal nondestructive method of x-ray testing, and also by the new holographic technique and the results compared. Discontinuities not readily identified by the normal non-destructive methods have been revealed by the newer approach. Finally destructive methods were employed to more accurately ascertain the type and extent of the defects found. Topp, D.; Jones, B.A.
Operational experience with the ACFM inspection technique for sub-sea weld inspection Environmental Engineering, Vol. 7, No. 1, pp. 9- 13 (Mar. 1994) The Alternating Current Field Measurements (ACFM) technique is an electromagnetic inspection technique capable of detecting and sizing surface breaking defects in metallic components. A system has been specifically developed for the inspection of welded structures to overcome many of the problems associated with earlier electromagnetic systems and in particular eddy current systems. The technique was initially developed to provide a means of determining the depth of cracks without the need for any electrical contact between the probe and structure. It has since been incorporated with advanced software to provide detection and sizing capability. 54767
Technical Diagnostics and Nondestructive Testing, Vol. 5, No. 2, pp. 85-89 (Apr.-Jun. 1993) The authors describe an expert system of assessment and predicting the quality of welded joints in components by magnetic inspection methods. Examples of formation of criteria of technology for producing components and magnetic inspection, defect parameters and their features are given. An example of application of such an expert system is discussed. Vaulin, S.L.; Mikhailov, S.P.; Shut-, M.L.: Shcherbinin,
Special features of magnetographic inspection of butt-welded seams in maritime pipelines Russian Journal of Nondestructive Testing, Vol. 29, No. 3, pp, 225-229 (Nov. 1993) The article describes some special features of magnetographic inspection of annular butt-welded seams in maritime pipelines with 16- mm wall thickness. It shows that the standard magnetizing devices PNU do not make it possible to detect defects acrossthe entire thicknessof the object; the article suggests and reports on tests of methods of sufficiently powerful magnetization under field conditions and in inspection under water. It describes the automated magnetographic flaw detector MGDSSH with microcomputer. 54212
Sato, K.
Quality control Japanese)
of welds by radiographic
inspection
54100
Mittleman, J.; Swan, L.
Naval Engineers Journals, Vol. 105, No. 5, pp. 37-42 (1993) Significant progress has been made in making underwater ultrasonic thickness gauging and magnetic particle inspections available to the fleet. The Coastal Systems Station has developed complete hardware packages supporting these two nondestructive test methods, and has introduced them to military inspectors at a shore intermediate maintenance activity, a destroyer tender, and a naval shipyard. 53830
Gavrilenko, B.K.
Possibilities of the acoustic emission method of inspecting welded joints Technical Diagnostics and Nondestructive Testing, Vol. 5. No. 1, pp. 11-14 (Jan.-Mar. 1993) Special features and main methodological assumptions of inspection of welded joints and the mechanism of formation of acoustic emission from different defects are examined. It is shown that the method can be used to inspect the presence of cracks and other defects. 53639
Fomichev, S.K.: Zhdanov, I.M.
Modelling cracks in welded joints Technical Diagnostics and Nondestructive Testing, Vol. 5, No. 1, pp. 60-63 (Jan.-Mar. 1993) A method of simulating cracks in welded joints is developed. It is based on the application of composite specimens with polished mating surfaces of the crack edges of the required configuration and subsequent welding around the crack mouth contour. The method makes it possible to produce external and internal, surface and continuous, median and edge and single and group cracks, delamination and cracks oriented along fibres with a tip radius not exceeding 5 mu m both in flat specimens and tubes without
Kudtyavtsev, S.I.: L&ash, A.G.; Vladimirova, S.O.
Criteria1 expert system for magnetic nondestructive inspection of the quality of welded joints
5423 I V.E.
HSE Translation no. 14553F, 32 pp. (Aug. 1992) The article is in two sections: - a description of the possibilities and limitations of use of non-destructive test methods with respect to the minimum guarantees normally required for welded assemblies; -a description of a comparative study into the possibilities for the detection and determination of the type and the dimensions of compactness defects, either through the use of ionising radiation or ultrasound. This investigation was carried out on a welded assembly mainly comprising an artificially created crack. Non-destructive testing of the assembly was canied out using X and gamma rays and ultrasound. After comparing the results obtained using these various tests, the main defect was revealed using macrography and texture to determine the actual dimensions of the defect.
Underwater inspection for welding and overhaul
54993 Clark, R.K.; Watson, A.R. New more intormative technique for weld inspection
54990
Francois, G.
Possibilities and limitations of non-destructive testing of welded assemblies
(In
Journal of JSNDI, Vol. 42, No. 10, pp. 548-550 (Oct. 1993)
122
varying the mechanical properties of metal in the crack zone. 53549
Lobanov, L.M.; Pivtorak, V.A.
Holographic NDT examination of welded structures Conference on Welding in Space, New Carrollton, Maryland (United States), 24-26 Sep. 1991. pp. 220-229 American Welding Society (199 1) The paper presents the results of study of residual stresses and quality control of welded structure elements by using the holographic interferometry. The effect of explosion treatment on value and distribution of the residual stresses is established. The efficiency of the holographic interferometry in the quality control of plane and shell structuresis shown. 53537 Chedister, W.C.; Long, J. Issues of magnetic particle weld inspection Materials Evaluation, Vol. 5 1, No. 9, pp. 976-977 (Sep. 1993) Several of the issues an inspector must deal with in the course of performing an MT inspection are described. The relevant ASTM standards are considered and ASNT recommended practices discussed. Their relevance to education and training is considered. 535 15
Murakami, K.; Murakami. K.
A model-controlled method for recognizing penetrameter in radiographic inspection of weld Journal of JSNDI, Vol. 2, pp. 84-99 (1989) An efficient recognition scheme is provided to enforce the precision of
the resulted patterns of penetrameter (PENE) which is included in the X-ray photographof welding (XPW). Because the size and shape of PENE are exactly known by the JIS standard,the “top-down”pattern models of PENE are easily given to the processingsystem.The recognition method of PENE proposed in this paper will provide a new phase to the researches on image processingof XPW. The final target of the processing of XPW is to detect
Chih-Kuo, F.
54108
Acoustic emission from cracking in a weldment subjected to non-uniform residual stresses Dissertation Abstracts International, Vol. 54, No. 7, pp. 3810-B3811-B (Jan. 1994) (DA 9332053) The acoustic emission generated from a cracking source in a weldment has been investigated theoretically and experimentally. In the theoretical analysis, a general analytical expression for the relationship between acoustic emission surface motion and crack opening displacement was derived based on the analogy of earthquake problems in seismology and crack opening in fracture mechanics. In the experimental investigation. acoustic emission signals have been recorded and analyzed during and after gas metal arc welding. In addition to the study of cold cracking of a weldment in air, hydrogen embrittlement was induced using the electrochemical method to cathodically charge weldments with hydrogen in order to accelerate cold cracking.
Proceedings of the 41st Annual Welding Conference and National AINDT Conference, Wollongong (Australia), 27 Sep.-l Oct. 1993. pp. 70-73. WTIA, AINDT (1993) ISBN O-86418-265-1 A weld in an aluminium plate has been inspected by the normal nondestructive method of x-ray testing, and also by the new holographic technique and the results compared. Discontinuities not readily identified by the normal non-destructive methods have been revealed by the newer approach. Finally destructive methods were employed to more accurately ascertain the type and extent of the defects found. Topp, D.; Jones, B.A.
Operational experience with the ACFM inspection technique for sub-sea weld inspection Environmental Engineering, Vol. 7, No. 1, pp. 9- 13 (Mar. 1994) The Alternating Current Field Measurements (ACFM) technique is an electromagnetic inspection technique capable of detecting and sizing surface breaking defects in metallic components. A system has been specifically developed for the inspection of welded structures to overcome many of the problems associated with earlier electromagnetic systems and in particular eddy current systems. The technique was initially developed to provide a means of determining the depth of cracks without the need for any electrical contact between the probe and structure. It has since been incorporated with advanced software to provide detection and sizing capability. 54767
Technical Diagnostics and Nondestructive Testing, Vol. 5, No. 2, pp. 85-89 (Apr.-Jun. 1993) The authors describe an expert system of assessment and predicting the quality of welded joints in components by magnetic inspection methods. Examples of formation of criteria of technology for producing components and magnetic inspection, defect parameters and their features are given. An example of application of such an expert system is discussed. Vaulin, S.L.; Mikhailov, S.P.; Shut-, M.L.: Shcherbinin,
Special features of magnetographic inspection of butt-welded seams in maritime pipelines Russian Journal of Nondestructive Testing, Vol. 29, No. 3, pp, 225-229 (Nov. 1993) The article describes some special features of magnetographic inspection of annular butt-welded seams in maritime pipelines with 16- mm wall thickness. It shows that the standard magnetizing devices PNU do not make it possible to detect defects acrossthe entire thicknessof the object; the article suggests and reports on tests of methods of sufficiently powerful magnetization under field conditions and in inspection under water. It describes the automated magnetographic flaw detector MGDSSH with microcomputer. 54212
Sato, K.
Quality control Japanese)
of welds by radiographic
inspection
54100
Mittleman, J.; Swan, L.
Naval Engineers Journals, Vol. 105, No. 5, pp. 37-42 (1993) Significant progress has been made in making underwater ultrasonic thickness gauging and magnetic particle inspections available to the fleet. The Coastal Systems Station has developed complete hardware packages supporting these two nondestructive test methods, and has introduced them to military inspectors at a shore intermediate maintenance activity, a destroyer tender, and a naval shipyard. 53830
Gavrilenko, B.K.
Possibilities of the acoustic emission method of inspecting welded joints Technical Diagnostics and Nondestructive Testing, Vol. 5. No. 1, pp. 11-14 (Jan.-Mar. 1993) Special features and main methodological assumptions of inspection of welded joints and the mechanism of formation of acoustic emission from different defects are examined. It is shown that the method can be used to inspect the presence of cracks and other defects. 53639
Fomichev, S.K.: Zhdanov, I.M.
Modelling cracks in welded joints Technical Diagnostics and Nondestructive Testing, Vol. 5, No. 1, pp. 60-63 (Jan.-Mar. 1993) A method of simulating cracks in welded joints is developed. It is based on the application of composite specimens with polished mating surfaces of the crack edges of the required configuration and subsequent welding around the crack mouth contour. The method makes it possible to produce external and internal, surface and continuous, median and edge and single and group cracks, delamination and cracks oriented along fibres with a tip radius not exceeding 5 mu m both in flat specimens and tubes without
Kudtyavtsev, S.I.: L&ash, A.G.; Vladimirova, S.O.
Criteria1 expert system for magnetic nondestructive inspection of the quality of welded joints
5423 I V.E.
HSE Translation no. 14553F, 32 pp. (Aug. 1992) The article is in two sections: - a description of the possibilities and limitations of use of non-destructive test methods with respect to the minimum guarantees normally required for welded assemblies; -a description of a comparative study into the possibilities for the detection and determination of the type and the dimensions of compactness defects, either through the use of ionising radiation or ultrasound. This investigation was carried out on a welded assembly mainly comprising an artificially created crack. Non-destructive testing of the assembly was canied out using X and gamma rays and ultrasound. After comparing the results obtained using these various tests, the main defect was revealed using macrography and texture to determine the actual dimensions of the defect.
Underwater inspection for welding and overhaul
54993 Clark, R.K.; Watson, A.R. New more intormative technique for weld inspection
54990
Francois, G.
Possibilities and limitations of non-destructive testing of welded assemblies
(In
Journal of JSNDI, Vol. 42, No. 10, pp. 548-550 (Oct. 1993)
122
varying the mechanical properties of metal in the crack zone. 53549
Lobanov, L.M.; Pivtorak, V.A.
Holographic NDT examination of welded structures Conference on Welding in Space, New Carrollton, Maryland (United States), 24-26 Sep. 1991. pp. 220-229 American Welding Society (199 1) The paper presents the results of study of residual stresses and quality control of welded structure elements by using the holographic interferometry. The effect of explosion treatment on value and distribution of the residual stresses is established. The efficiency of the holographic interferometry in the quality control of plane and shell structuresis shown. 53537 Chedister, W.C.; Long, J. Issues of magnetic particle weld inspection Materials Evaluation, Vol. 5 1, No. 9, pp. 976-977 (Sep. 1993) Several of the issues an inspector must deal with in the course of performing an MT inspection are described. The relevant ASTM standards are considered and ASNT recommended practices discussed. Their relevance to education and training is considered. 535 15
Murakami, K.; Murakami. K.
A model-controlled method for recognizing penetrameter in radiographic inspection of weld Journal of JSNDI, Vol. 2, pp. 84-99 (1989) An efficient recognition scheme is provided to enforce the precision of
the resulted patterns of penetrameter (PENE) which is included in the X-ray photographof welding (XPW). Because the size and shape of PENE are exactly known by the JIS standard,the “top-down”pattern models of PENE are easily given to the processingsystem.The recognition method of PENE proposed in this paper will provide a new phase to the researches on image processingof XPW. The final target of the processing of XPW is to detect