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New System for Mechanised X-Ray Inspection of Welded Austenic Pipes

  • One of the most important tasks for in-service weld inspection of Circumferential welds is the detection of planar defects and its sizing. The information about the shape, length and depth of defects like cracks and lack of fusion can be measured quantitatively with a mechanised system for manipulation of X-ray source and line camera. The well adjusted manipulation system allows the testing of pipes with a diameter between 176 mm and 500 mm. The system is based on several modules, which can be adjusted to the testing problem. The energy of the X-ray tube amounts 225 keV. The pixel resolution of the line camera is 50µm for 2048 pixels per line. The camera and the X-ray tube are separated on the pipe by an angle of 180°. They are moved line by line around the circumference to acquire the radiometric image. The basic problem of radiography as well as of the radiometric scan technique is the dependence of the measured crack contrast on the radiation direction in relation to the crackOne of the most important tasks for in-service weld inspection of Circumferential welds is the detection of planar defects and its sizing. The information about the shape, length and depth of defects like cracks and lack of fusion can be measured quantitatively with a mechanised system for manipulation of X-ray source and line camera. The well adjusted manipulation system allows the testing of pipes with a diameter between 176 mm and 500 mm. The system is based on several modules, which can be adjusted to the testing problem. The energy of the X-ray tube amounts 225 keV. The pixel resolution of the line camera is 50µm for 2048 pixels per line. The camera and the X-ray tube are separated on the pipe by an angle of 180°. They are moved line by line around the circumference to acquire the radiometric image. The basic problem of radiography as well as of the radiometric scan technique is the dependence of the measured crack contrast on the radiation direction in relation to the crack location. Only parallel transmission to the crack plane provides sufficient contrast. This requires application of the multi-angle technique. The developed scanner enables modification of the radiation direction. It is possible to set up the system for a special inspection of side wall flaws. Scanning the weld under different angles provides multi -angle projections which improve the probability of detection for planar inhomogeneities in the material like cracks and lack of fusion. Furthermore, the multi-angle technique provides enough information for a 3D-reconstruction of the weld structure. New methods of digital laminography and tomosynthesis permit the measurement of the shape and depth of the indications. The developed system, which is applicable for mobile in service inspection, is presented together with the results of the measurement techniques like planar scan, coplanar laminography, tomosynthesis and cross-sectional planar tomography.zeige mehrzeige weniger

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Metadaten
Autor*innen:Bernhard Redmer, Uwe Ewert, E. Hofmann, B. Neundorf
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):3rd International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components
Jahr der Erstveröffentlichung:2001
Herausgeber (Institution):Europäische Kommission / Gemeinsame Forschungsstelle
Verlagsort:Seville
Erste Seite:52
Letzte Seite:60
Veranstaltung:3rd International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components
Veranstaltungsort:Seville, Spain
Beginndatum der Veranstaltung:2001-11-14
Enddatum der Veranstaltung:2001-11-16
URL:http://www.ndt.net/abstract/ndesi01/data/51.htm
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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