10.14489/td.2019.03.pp.004-013

2019, 03 March

DOI: 10.14489/td.2019.03.pp.004-013

Badalyan V. G.
ANALYSIS OF THE RELIABILITY OF TESTING IN ULTRASONIC DEFECTOMETRY
(pp. 4-13)

Abstract. For assessing the reliability of testing results obtained using the ultrasonic non-destructive testing (UT) it is need to be taken into account not only the probability of flaws detection, but also the probability of missing them and fixing false flaws. For these purposes, ROC analysis of testing data is often used, which reflects the mutual dependence of the number of false and the number of correctly found flaws. The ROC analysis was performed according to the UT of 24 of welded joints of austenitic pipelines with a diameter of 325x15, containing 61 real cracks; as a result, ROC-charts and ROC-curves are constructed. The coordinates of the occurrence, the length and height of cracks are determined by means of metallographic studies. The effectiveness of the use of ultrasonic flaw characterization (UFC) and conventional flaw detection at ultrasonic inspection is considered. In UFC, the flaw parameters (length, height) are determined by focused acoustic images; in traditional flaw detection – according to the amplitude of the signal from the flaw. The ROC diagram additionally presents the inspection results corresponding to individual groups of operators (three groups each on the UT by the AUGUR system and the traditional flaw detector). Analysis of the ROC diagrams showed that the methods of UFC are more effective than the method of traditional flaw detection, and the variation of the values of the Youden index for certain groups of operators is much smaller when using the methods of ultrasonic flaw detection. According to UFC data, ROC curves are constructed depending on the height of flaws. The reliability of the inspection of flaws of different heights for the methods of UFC has been evaluated. Building in practice such graphs based on the results of traditional ultrasonic flaw detection in most cases is not possible. This is due to the fact that the corresponding ROC curves are plotted depending on the amplitude of the signal from the flaw, and the height of the flaws weakly correlate with the amplitude of the signal. It was demonstrated how the ROC curves provide additional information for optimizing the methods of ultrasonic testing by increasing the signal-to-noise ratio, choosing conditions for maximizing the Youden index.

Keywords: ultrasonic flaw characterization, AUGUR, reliability of the testing, Receiver Operating Characteristics

+ - About the Authors Click to collapse

V. G. Badalyan (Co Ltd “Scientific Production Center of Nondestructive Ultrasonic Testing “ECHO+”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Berens A. P. (2000). Probability of detection (PoD) analysis for the advanced retirement for cause (RFC). Engine structural integrity program (ENSIP) nondestructive evaluation (NDE) system development, Vol. 1. PoD analysis. Final report. AFRL-ML-WP-TR-2001-4010.
2. Volchenko V. N. (1979). The probability and reliability of assessing the quality of metal products. Moscow: Metallurgiya. [in Russian language]
3. Nockemann C., Heidt H., Thomsen N. (1991). Reliability in NDT: ROC study of radio graphic weld inspections. NDT&E International, 24(5), pp. 235-245.
4. Visser W. (2002). POD/POS curves for non-destructive examination. HSE Offshore Technology Report 2000/18.
5. Fawcett T. (2004). ROC Graphs: Notes and Practical Considerations for Researchers. Kluwer Academic Publications.
6. Van der Verden. (1960). Mathematical statistics. Moscow: IL. [in Russian language]
7. Aleshin N. P., Vadkovskiy N. N., Volkova N. N. (1988). Ultrasonic testing of austenitic welds: analysis of methods and recommendations for improving reliability. Defektoskopiya, (2), pp. 43-59. [in Russian language]
8. Badalyan V. G. (2016). Evaluation of the reliability of ultrasonic testing results in austenitic welded joints (using coherent systems). Kontrol'. Diagnostika, (12), pp. 4-9. [in Russian lnaguge] DOI: 10.14489/td.2016.12.pp.004-009
9. Fucsok F., Muller C., Scharmach M. (2005). Measuring of the reliability of NDE. The 8 International Conference of the Slovenian Society for NDT «Application of Сontemporary Non-Destructive Testing in Engineering», 1 – 3 September, pp. 173-180. Portoroz.
10. Scherbinskiy V. G. (2003). Technology of ultrasonic testing of welded joints. Moscow: Tisso. [in Russian language]
11. Vopilkin A. H. (Ed.), Badalyan V. G., Bazulin E. G. et al. (2008). Ultrasonic inspection of metals using holographic methods. Moscow: Mashinostroenie. [in Russian language]
12. Jacques F., Moreau F., Ginzel E. (2003). Ultrasonic backscatter sizing using phased array – developments in tip diffraction flaw sizing. Insight – Non-Destructive Testing and Condition Monitoring, 45(11), pp. 724-728.
13. Badalyan V. G. (2007). Evaluation of testing results of acoustic images. Defektoskopiya, (4), pp. 39-58. [in Russian language]
14. Badalyan V. G., Vopilkin A. H., Grebennikov V. V., Grebennikov D. V. (2000). Comparative analysis of ways to increase the signal-to-noise ratio with ultrasonic testing of austenitic seams. Kontrol'. Diagnostika, (9), pp. 29-35. [in Russian language]
15. Methods of automated ultrasonic testing of ring welds of austenitic pipelines of Du300 RBMK reactors using the AVGUR 5.2 system. (2006). Concern "Rosenergoatom": Мoscow. [in Russian language]
16. Ivanov V. I., Konovalov N. N., Kotel'nikov V. S. et al. (2015). Issues of accident risk assessment using technical diagnostics. Kontrol'. Diagnostika, (3), pp. 12-20. [in Russian language] DOI: 10.14489/td.2015.03.pp.012-020
17. Badalyan V. G. (2019). Possibilities of ultrasonic defectometry and riskoriented approach in diagnostics. Kontrol'. Diagnostika, (1). [in Russian language] DOI: 10.14489/td.2019.01.pp.022-031
18. Vopilkin A. H. (Ed.), Bazulin A. E., Bazulin E. G., Kokolev S. A. et al. (2015). AVGUR-ART automated control system - from the art of new features to practical diagnostics. Ultrasonic defectometry, pp. 76-85. Moscow–Saint Petersburg: SVEN. [in Russian language]

+ - Purchase digital version of a single article Click to collapse

This article is available in electronic format (PDF).

The cost of a single article is 350 rubles. (including VAT 20%). After you place an order within a few days, you will receive following documents to your specified e-mail: account on payment and receipt to pay in the bank.

After depositing your payment on our bank account we send you file of the article by e-mail.

To order articles please copy the article doi:

10.14489/td.2019.03.pp.004-013

and fill out the form