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Specific aspects of radiographic inspection performed on fillet welds of small diameter pipe nozzles
N DT Abstracts experimental results are demonstrated for the submerged arc welding process. In this process the welding pool is covered by a thick layer of welding flux and is therefore optically invisible. By using computer data on the grey levels of the weld images and their histogram distributions, the three- dimensional shape of the submerged arc pool can be recognized, image- digitized and analysed in real time at the rate of 30 frames per second. The depth of the welding pool which characterizes the weld penetration is a very important characteristic of the weld quality. This characteristic can he measured in real time and used for weld tracking and welding current control.
Polansky, D.; Criscuolo, E.; Berger, H.; Jones, T.S. Development of graded reference radiographs for aluminum welds. Phase 1 41277
Industrial Quality Inc., Gaithersburg, Maryland (United States) AD-A195 594/7/GAR, 33 pp. (Mar. 1988) The purpose of this project was to develop a data bank for graded sets of reference radiographs of aluminum welds. These are extremely valuable for procurements related to ships, fircraft, other vehicles, construction and similar projects that include aluminum welds, and serve as a recognized way of acceptance or rejection of wehls. A present set of reference radiographs are used for steel welds. During this project, a data bank of production radiographs of aluminum weilds was collected. Several thousand radiographs are presently in the data bank. From this data bank, a set of proposed reference radiographs has been assembled. These include five grades of reference radiographs tor three types of porosity, fine scattered porosity, coarse scattered porosity and linear porosity. The suggested reference radiograph document also includes three grades of clustered porosity, two illustrations of inadequate penetration, two illustrations of tungsten inclusions, and examples of longitudinal and transverse cracks, lack of fusion and undercut.
Spremo, N.; Begovic, B.; Doko, A. Specific aspects of radiographic inspection performed on fillet welds of small diameter pipe nozzles 41063
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands), 23-28 Apr. 1989, Vol. 2, pp. 1143-1148. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989. High operating parameter vessels, equipped with small diameter pipe nozzles connected to the vessel shell by means of welding procedure are used in thermal power, petrochemical, nuclear and other vital plants. It is necessary to make a 100% range radiographic inspection of such, usually fillet welds of small diameter pipe nozzles. The paper presents experience gained in the selection of radiographic inspection method on fillet welds of pipe nozzles with a 100 mm interrtal diameter and 25 mm wall thickness on vital vessel for nuclear power plarLt.
Berger, H.; Polansky, D.; Criscuolo, E.L. A data bank for graded reference radiographs of aluminum welds 40847
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 86-89. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 A set of graded reference radiographs of aluminum welds has been assembled. The set covers the thickness range from 9.5 to 19mm for aluminum in the 5000 and 6000 series alloys. The set includes five grades for three types of porosity, fine scattered, coarse scattered and linear; three grades of clustered porosity; two illustrations of inadequate penetration and tungsten inclusions and examples of longitudinal and transverse cracks, lack of fusion and undercut. This will serve as an interim set until a more formal graded reference radiograph document becomes available.
Munro, J.J.; McNulty, R.E.; DeSimone, A. An assessment of the detectability of cracks in the radioscopic examination of weldments 40843
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherhmds) 23-28 Apr. 1989, Vol. 1, pp. 62-67. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 Real-time radioscopic examination of welds is a rapidly developing technique. Contrast sensitivities better than 2% are often required. Real-time radioscopic equipment is now available which can satisfy the contrast sensitivity requirements for this type of weld inspection. However, there exists a degree of controversy regarding the ability of real-time radioscopic systems to del~ct cracks. A stud)' was conducted to assess the ability of radioscopic systems to detect cracks in a thickness typical of the range of thicknesses encountered in weld radiography.
189
Eckelt, B.; Meyendorf, N.; Morgner, W.; Richter, U. Use of automatic image processing for monitoring of welding processes and weld inspection
40838
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 37-41. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 Advantageous incorporation of image processing into quality assurance in automatic welding is exemplified by thermography as well as flaw detection by radiography. The problem area of monitoring the temperature regime has been solved, permitting quality assurance of specified mechanical and process properties. Weld flaws are automatically detected and satisfactorily evaluated by means of radiographs. Work is in hand to improve the hardware and flaw classification as a function of the load conditions expected.
Rokhlin, S.I. In-process radiographic evaluation of arc welding 40837
Materials Evaluation, Vol. 47, No. 2, pp. 219-224 (Feb. 1989) Real-time radiography is used for volume observation in the welding pool and the heat-affected zone during the weld process. The advantages of such a technique are on-line testing of defect formation in the weld, the study of metal fusion and filler metal-base metal interaction, and the study of metal transfer in the welding pool. This technique may also he used for postservice real-time remote testing of weld quality. Monitoring of the welding process with real-time radiography opens new opportunities for the study of arc welding physics. As an example, the metal transfer and plasma pressure cycle for submerged arc welding are documented. Another application is to use information on weld quality, received from automatic recognition of real-time radiographic images, in feedback for closed-loop intelligent weld control. This new concept of arc welding process control as distinguished from conventional welding quality is used. An experimental system that implements this concept is discussed.
Mayes, M.J.; Fitting, D.W. Evaluation of a dry.silver system for weld radiography
40836
Materials Evaluation, Vol. 47, No. 2, pp. 225-232 (Feb. 1989) A dry-silver industrial x-ray system is evaluated for use in xradiography of steel weldments. Evaluation is based on comparisons with conventional radiographic film, sensitivity obtained using penetrameters, applicable code requirements, and subjective radiographer impressions. Characteristic curves and technique charts have been constructed and weld radiographs have been made of full- penetration butt weldments in fiat plate. it has been determined that, using 3M Inspex film, resolution required by common welding inspection codes is obtainable for steel weldments up to 1 in. (2.5 cm) in thickness. The product is found to he attractive in regard to cost, convenience, speed, portability, and low maintenance. Best results are obtained if weld cross section is constant (within -t-- I/4 in. [6.4 mini). Proper selection of x-ray tube potential and intensifying screen is required. With proper control of radiographic variables and within certain limitations, the 3M system is a useful supplementary radiographic tool.
Kobayashi,H., Ookubo, K.; Ikeda, Y.; Wakao, H. Detection of weld crackings using neutron radiography technique (In Japanese)
40675
Journal of Japanese Society for Non-Destructive Inspection, Vol. 37, No. 9A, pp. 767-768 (Sep. 1988)
Daum, W.; Heidt, H.; Rose, P.; Builtjes, J.H. Real time evaluation of weld radiographs by digital image processing 40329
Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom) 13-17 Sep. 1987. Vol. 3, pp. 1568-1574. Pergamon Press, 3173 pp. (1988). In this article some basic aspects of the hardware and software adaption for real time image analysis of weld radiographs are discussed and an optimized image analysis strategy is presented.
Rokhlin, S.I.; Guu, A.C.; Applegate, D.E. In-process radiography of arc weld 40133
Review of Progress in Quantitative Nondestructive Evaluation, Williamsburg, Virginia (United States), 22-26 Jun. 1987. Vol. 7B, pp. 1581-1588. Edited by D.D.Thompson and D.E. Chimenti, Plenum Press, 1988. This paper summarizes some results for in-process evaluation of weld penetration for submerged arc welding. Submerged arc welding is distinguished from other welding techniques in that the welding pool is covered by a thick layer of special powder which is called 'welding flux'. During welding this flux melts and shields the arc while the molten metals
Polansky, D.; Criscuolo, E.; Berger, H.; Jones, T.S. Development of graded reference radiographs for aluminum welds. Phase 1 41277
Industrial Quality Inc., Gaithersburg, Maryland (United States) AD-A195 594/7/GAR, 33 pp. (Mar. 1988) The purpose of this project was to develop a data bank for graded sets of reference radiographs of aluminum welds. These are extremely valuable for procurements related to ships, fircraft, other vehicles, construction and similar projects that include aluminum welds, and serve as a recognized way of acceptance or rejection of wehls. A present set of reference radiographs are used for steel welds. During this project, a data bank of production radiographs of aluminum weilds was collected. Several thousand radiographs are presently in the data bank. From this data bank, a set of proposed reference radiographs has been assembled. These include five grades of reference radiographs tor three types of porosity, fine scattered porosity, coarse scattered porosity and linear porosity. The suggested reference radiograph document also includes three grades of clustered porosity, two illustrations of inadequate penetration, two illustrations of tungsten inclusions, and examples of longitudinal and transverse cracks, lack of fusion and undercut.
Spremo, N.; Begovic, B.; Doko, A. Specific aspects of radiographic inspection performed on fillet welds of small diameter pipe nozzles 41063
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands), 23-28 Apr. 1989, Vol. 2, pp. 1143-1148. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989. High operating parameter vessels, equipped with small diameter pipe nozzles connected to the vessel shell by means of welding procedure are used in thermal power, petrochemical, nuclear and other vital plants. It is necessary to make a 100% range radiographic inspection of such, usually fillet welds of small diameter pipe nozzles. The paper presents experience gained in the selection of radiographic inspection method on fillet welds of pipe nozzles with a 100 mm interrtal diameter and 25 mm wall thickness on vital vessel for nuclear power plarLt.
Berger, H.; Polansky, D.; Criscuolo, E.L. A data bank for graded reference radiographs of aluminum welds 40847
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 86-89. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 A set of graded reference radiographs of aluminum welds has been assembled. The set covers the thickness range from 9.5 to 19mm for aluminum in the 5000 and 6000 series alloys. The set includes five grades for three types of porosity, fine scattered, coarse scattered and linear; three grades of clustered porosity; two illustrations of inadequate penetration and tungsten inclusions and examples of longitudinal and transverse cracks, lack of fusion and undercut. This will serve as an interim set until a more formal graded reference radiograph document becomes available.
Munro, J.J.; McNulty, R.E.; DeSimone, A. An assessment of the detectability of cracks in the radioscopic examination of weldments 40843
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherhmds) 23-28 Apr. 1989, Vol. 1, pp. 62-67. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 Real-time radioscopic examination of welds is a rapidly developing technique. Contrast sensitivities better than 2% are often required. Real-time radioscopic equipment is now available which can satisfy the contrast sensitivity requirements for this type of weld inspection. However, there exists a degree of controversy regarding the ability of real-time radioscopic systems to del~ct cracks. A stud)' was conducted to assess the ability of radioscopic systems to detect cracks in a thickness typical of the range of thicknesses encountered in weld radiography.
189
Eckelt, B.; Meyendorf, N.; Morgner, W.; Richter, U. Use of automatic image processing for monitoring of welding processes and weld inspection
40838
Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 37-41. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 Advantageous incorporation of image processing into quality assurance in automatic welding is exemplified by thermography as well as flaw detection by radiography. The problem area of monitoring the temperature regime has been solved, permitting quality assurance of specified mechanical and process properties. Weld flaws are automatically detected and satisfactorily evaluated by means of radiographs. Work is in hand to improve the hardware and flaw classification as a function of the load conditions expected.
Rokhlin, S.I. In-process radiographic evaluation of arc welding 40837
Materials Evaluation, Vol. 47, No. 2, pp. 219-224 (Feb. 1989) Real-time radiography is used for volume observation in the welding pool and the heat-affected zone during the weld process. The advantages of such a technique are on-line testing of defect formation in the weld, the study of metal fusion and filler metal-base metal interaction, and the study of metal transfer in the welding pool. This technique may also he used for postservice real-time remote testing of weld quality. Monitoring of the welding process with real-time radiography opens new opportunities for the study of arc welding physics. As an example, the metal transfer and plasma pressure cycle for submerged arc welding are documented. Another application is to use information on weld quality, received from automatic recognition of real-time radiographic images, in feedback for closed-loop intelligent weld control. This new concept of arc welding process control as distinguished from conventional welding quality is used. An experimental system that implements this concept is discussed.
Mayes, M.J.; Fitting, D.W. Evaluation of a dry.silver system for weld radiography
40836
Materials Evaluation, Vol. 47, No. 2, pp. 225-232 (Feb. 1989) A dry-silver industrial x-ray system is evaluated for use in xradiography of steel weldments. Evaluation is based on comparisons with conventional radiographic film, sensitivity obtained using penetrameters, applicable code requirements, and subjective radiographer impressions. Characteristic curves and technique charts have been constructed and weld radiographs have been made of full- penetration butt weldments in fiat plate. it has been determined that, using 3M Inspex film, resolution required by common welding inspection codes is obtainable for steel weldments up to 1 in. (2.5 cm) in thickness. The product is found to he attractive in regard to cost, convenience, speed, portability, and low maintenance. Best results are obtained if weld cross section is constant (within -t-- I/4 in. [6.4 mini). Proper selection of x-ray tube potential and intensifying screen is required. With proper control of radiographic variables and within certain limitations, the 3M system is a useful supplementary radiographic tool.
Kobayashi,H., Ookubo, K.; Ikeda, Y.; Wakao, H. Detection of weld crackings using neutron radiography technique (In Japanese)
40675
Journal of Japanese Society for Non-Destructive Inspection, Vol. 37, No. 9A, pp. 767-768 (Sep. 1988)
Daum, W.; Heidt, H.; Rose, P.; Builtjes, J.H. Real time evaluation of weld radiographs by digital image processing 40329
Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom) 13-17 Sep. 1987. Vol. 3, pp. 1568-1574. Pergamon Press, 3173 pp. (1988). In this article some basic aspects of the hardware and software adaption for real time image analysis of weld radiographs are discussed and an optimized image analysis strategy is presented.
Rokhlin, S.I.; Guu, A.C.; Applegate, D.E. In-process radiography of arc weld 40133
Review of Progress in Quantitative Nondestructive Evaluation, Williamsburg, Virginia (United States), 22-26 Jun. 1987. Vol. 7B, pp. 1581-1588. Edited by D.D.Thompson and D.E. Chimenti, Plenum Press, 1988. This paper summarizes some results for in-process evaluation of weld penetration for submerged arc welding. Submerged arc welding is distinguished from other welding techniques in that the welding pool is covered by a thick layer of special powder which is called 'welding flux'. During welding this flux melts and shields the arc while the molten metals