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Time-of-flight diffraction (TOFD) method of ultrasonic testing is a sensitive and accurate method for the nondestructive testing of welds for defects. TOFD originated from tip diffraction techniques which were first published by Silk and Liddington in 1975 which paved the way for TOFD. Later works on this technique are given in a number of sources which include Harumi et al. (1989), Avioli et al. (1991), and Bray and Stanley (1997).

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  • TOFD
  • Time-of-flight diffraction ultrasonics
  • TOFD
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  • Das TOFD-Verfahren (Time of Flight Diffraction) ist ein im Vereinigten Königreich in den 1970ern entwickeltes Ultraschall–Prüfverfahren, welches vor allem bei der Prüfung von Schweißnähten eingesetzt wird. Während üblicherweise Fehlstellen im Material durch die Analyse von reflektierten Signalen aufgespürt werden, nutzt TOFD vor allem die Beugungssignale, die von Ungänzen herrühren. TOFD ist eine der wenigen Prüftechniken, die in der Lage ist, einen Fehler oder eine Ungänze relativ genau mit Länge, Tiefe und Höhe zu beschreiben. Alle anderen Ultraschallprüfverfahren beschreiben eine Ungänze aufgrund des Reflexionsverhaltens und nicht aufgrund der realen Ausdehnung.
  • TOFD, sigla di Time of flight diffraction ultrasonics, è una metodologia di ispezione a ultrasuoni, e in quanto tale rientra nella famiglia dei controlli non distruttivi. Il TOFD è un sistema computerizzato ideato nel Regno Unito dal Dr. Maurice Silk per l'utilizzo nell'industria delle apparecchiature nucleari. L'uso del TOFD consente la mappatura di fessurazioni o discontinuità di minimo diametro, ed aggiunge accuratezza alla misurazione delle stesse, consentendo una speranza di vita superiore alle apparecchiature esaminate, rispetto al classico controllo radiografico.
  • Time-of-flight diffraction (TOFD) method of ultrasonic testing is a sensitive and accurate method for the nondestructive testing of welds for defects. TOFD originated from tip diffraction techniques which were first published by Silk and Liddington in 1975 which paved the way for TOFD. Later works on this technique are given in a number of sources which include Harumi et al. (1989), Avioli et al. (1991), and Bray and Stanley (1997).
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  • Das TOFD-Verfahren (Time of Flight Diffraction) ist ein im Vereinigten Königreich in den 1970ern entwickeltes Ultraschall–Prüfverfahren, welches vor allem bei der Prüfung von Schweißnähten eingesetzt wird. Während üblicherweise Fehlstellen im Material durch die Analyse von reflektierten Signalen aufgespürt werden, nutzt TOFD vor allem die Beugungssignale, die von Ungänzen herrühren. TOFD ist eine der wenigen Prüftechniken, die in der Lage ist, einen Fehler oder eine Ungänze relativ genau mit Länge, Tiefe und Höhe zu beschreiben. Alle anderen Ultraschallprüfverfahren beschreiben eine Ungänze aufgrund des Reflexionsverhaltens und nicht aufgrund der realen Ausdehnung.
  • TOFD, sigla di Time of flight diffraction ultrasonics, è una metodologia di ispezione a ultrasuoni, e in quanto tale rientra nella famiglia dei controlli non distruttivi. Il TOFD è un sistema computerizzato ideato nel Regno Unito dal Dr. Maurice Silk per l'utilizzo nell'industria delle apparecchiature nucleari. L'uso del TOFD consente la mappatura di fessurazioni o discontinuità di minimo diametro, ed aggiunge accuratezza alla misurazione delle stesse, consentendo una speranza di vita superiore alle apparecchiature esaminate, rispetto al classico controllo radiografico.
  • Time-of-flight diffraction (TOFD) method of ultrasonic testing is a sensitive and accurate method for the nondestructive testing of welds for defects. TOFD originated from tip diffraction techniques which were first published by Silk and Liddington in 1975 which paved the way for TOFD. Later works on this technique are given in a number of sources which include Harumi et al. (1989), Avioli et al. (1991), and Bray and Stanley (1997). Bray and Stanley (1997) summarized TOFD as tip-diffraction techniques which utilized the principle that the tips of a crack when struck by a wave will diffract the signals back to the other location on the surface. The depth of these tips can be determined from the diffracted energy. TOFD was invented in the UK in the 1970s initially as a research tool. The use of TOFD enabled crack sizes to be measured more accurately, so that expensive components could be kept in operation as long as possible with minimal risk of failure.
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