10.14489/td.2018.11.pp.014-024

2018, 11 November

DOI: 10.14489/td.2018.11.pp.014-024

Markov А. A., Maksimova E. A.
ANALYZING THE CURVE OF BOTTOM SIGNALS – THE WAY TO INCREASE THE RELIABILITY OF RAIL MONITORING
(pp. 14-24)

Abstract. In the article the questions of ultrasonic flaw detection of rails by mirror through transmission method are considered. This method is based on analysis of the attenuation of the amplitudes of signals reflected from the bottom surface of the tested object (bottom signals) over the defect. The principle of displaying the amplitude curve of bottom signals on the B-scan is presented. The physical nature of the interaction of ultrasonic waves with a defect using the echo method and the mirror through transmission method is fundamentally different. A complex analysis of these methods can increase the probability of detecting of defects in the railneck, head and bottom. The article presents examples of increasing the probability of detecting defects using this information. It is possible to localize sections with the corrosion of the rail bottom where dangerous cracks appear. This method also fixes welded joints of rails, which do not always cause the appearance of signals in ultrasonic channels of flaw detectors.

Keywords: non-destructive testing of rails, ultrasonic flaw detection of rails, Mirror Through-Transmission Method of Ultrasonic Nondestructive Testing, amplitude of the bottom signal, amplitude curve of bottom signals, signal recording, B-scan, rail defects.

+ - About the Authors Click to collapse

А. A. Markov, E. A. Maksimova (Radioavionica Corporation, St. Petersburg, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Roslovets A. A. (2017). Diagnosis and monitoring of rails: the current state and prospects. Put’ i Putevoe Hozyaistvo, (11), pp. 2-7 [in Russian language]
2. Markov A. A., Shpagin D. A. (2008). Ultrasonic flaw detection of rails. St. Petersburg: "Obrazovanie – Kul'tura ". [in Russian language]
3. Markov A. A., Kuznetsova E. A. Defectoscopy of rails. Formation and analysis of signals. Book 1. Fundamentals. A practical guide in two books. St. Petersburg: Kul'tInform Press. [in Russian language]
4. Gurvich, A. K. (1976). Mirror-shadow method of ultrasonic flaw detection. Moscow: Mashinostroenie. [in Russian language]
5. The instruction "Defects of rails. Classification, catalog and parameters of defective and highly defective rails ". Moscow: Rasporyazhenie OAO «RZHD». [in Russian language]
6. Gurvich A. K., Markov A. A. (1989). Mirror through-transmission method of ultrasonic testing of articles of equal section. RF Patent № RU1497561. [in Russian language]
7. Gurvich A. K. and Markov A. A. (1990). Mirror through-transmission method of testing with continuous emission of ultrasonic vibrations. Defektoskopiya, (1), pp. 22-32. [in Russian language]
8. Markov A. A., Kuznetsova E.A. (2014). Defectoscopy of rails. Formation and analysis of signals. Book 2. Explanation of defectograms. St. Petersburg: Ultra Print. [in Russian language]
9. Gurvich A.K., Akhmetova A.A., Vapilkin A.Kh. (2011). Acoustic characteristics of metal in the area of joints of electric contact welding of rails. V mire nerazrusha-yuschego kontrolya, 51(1), pp. 84-86. [in Russian language]
10. Markov A.A. (2011). Increasing the probability of detection of cracks in rails. Kontrol’. Diagnostika, (11), pp. 16-24. [in Russian language]
11. Markov AA, Kuznetsova E.A. (2012). Additional capabilities of flaw detectors "AVIKON". Put’ i Putevoe Hozyaistvo, (9), pp. 23-29. [in Russian language]

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