A. S. Shleenkov, D. V. Novgorodov, Yu. B. Sobakinsky

COMPARING THE RESULTS OF TESTING A LONGITUDINAL TUBE WELD BY NONDESTRUCTIVE METHODS

Defects of longitudinal tube welds identified by X-ray inspection are studied in order to determine possible causes of their occurrence and to assess the reliability of nondestructive testing results. Metallographic analysis shows that the base metal and weld metal meet the requirements of regulatory documents. The strength properties and the chemical composition conform to the standards. The contamination with non-metallic inclusions in the segregation streamers of the sheet extending to the edge and falling into the fusion zone was detected in X-ray photographs and incorrectly interpreted as a defect. This assumption is based on the correlation of X-ray patterns with the position of the grooves in the zones of the studied welded joints, but it ignores the results of studying by other nondestructive testing methods, and most importantly, it is not confirmed by metallographic studies. Neither were these defects found in the tubes during magnetic flaw detection by means of a UMD-101M device in the line of production of longitudinally electric-welded tubes. Erroneous defect identification during X-ray inspection happens in tube making. The results of the study show the expediency of the integrated application of different testing methods for a reliable assessment of the quality of tubes or pipes of both small and large diameters.

Acknowledgments: The work was carried out under the state assignment from the Ministry of Science and Higher Education of the Russian Federation (theme Diagnostics, No. 122021000030-1).

References:

1. GOST 1050–2013. (In Russian).
2. GOST 10705–80. (In Russian).
3. Shleenkov, A.S., Bulychev, O.A., Shleenkov, S.A., and Novgorodov, D.V. The UMD–101MK flaw detection equipment for automated magnetic inspection of electrically welded small and medium pipes over the entire wall thickness and perimeter. Diagnostics, Resource and Mechanics of materials and structures, 2019, 6, 87–101. DOI: 10.17804/2410- 9908.2019.6.087-101. Available at: http://dream-journal.org/issues/2019-6/2019-6_267.html
4. Shleenkov, A.S., Bychkov, V.G., Bulychev, O.A., Lyadova, N.M., and Shcherbinin, V.E. Estimating the possibility of the magnetic detection of microflaws in weld seams of longitudinal electric-welded pipes manufactured by butt high-frequency welding. Russian Journal of Nondestructive Testing, 2010, 46, 92–97. DOI: 10.1134/S1061830910020038.
5. Shleenkov, A.S., Bulychev, O.A., and Shleenkov, S.A. The UMD–101M plant for automated bulk magnetic nondestructive testing of quality of electric-welded pipes. Russian Journal of Nondestructive Testing, 2008, 44, 574–578. DOI: 10.1134/S106183090808010X.
6. Kruglova, G.V., Knyazyuk, L.V., and Kortov, V.S. Determination of faulty-fusion dimensions in a cross section of a welded seam by radiographic testing. Russian Journal of Nondestructive Testing, 2005, 41, 251–255. DOI: 10.1007/s11181-005-0158-x.
7. Kruglova, E.V. and Knyazyuk, L.V. Determination of welded joint flaw dimensions on the basis of scanned X-ray images. Russian Journal of Nondestructive Testing, 2004, 40, 57–60. DOI: 10.1023/B:RUNT.0000036430.21233.f3.
8. Tarasov, S.Yu., Rubtsov, V.E., Kolubaev, E.A., Gnyusov, S.F., and Kudinov, Yu.A. Radioscopy of remnant joint line in a friction stir welded seam. Russian Journal of Nondestructive Testing, 2015, 51, 573–579. DOI: 10.1134/S1061830915090090.
9. Kudoyarov, R.U., Bagin, A.S., and Mogilner, L.Yu. Increasing the detection of defects in welds of large-diameter pipes in the conditions of manufacturing plants. Nauka i Tekhnologii Truboprovodnogo Transporta Nefti i Nefteproduktov, 2016, 4, 78–83. (In Russian).
10. GOST 5640–68. (In Russian).
11. GOST 8233–56. (In Russian).
12. GOST 5639–82. (In Russian).
13. GOST 1778–70. (In Russian).
14. Mokrousov, V.I. Influence of a defect in the external chamfer of a longitudinal weld on the strength of a steel pipe. Sovremennye Tendentsii Razvitiya Nauki i Tekhnologiy, 2016, 2–3, 67–74. (In Russian).
15. Vyboishchik, L., Sopin, N., Kolosovsky, M., Ermolchik, E., and Abuzdin, A. The influence of post-welding treatment on the mechanical and corrosion properties of VChS welded joints. Tekhnadzor, 2015, 12 (109), 594–595. (In Russian).
16. Zakharova, I.V., Royanov, V.A., and Dushenin, S.S. Analysis of the influence of non-metallic inclusions and microstructure on the quality of welded joints of pipe steel. Nauka ta Virobnitstvo, 2018, 19, 88–97. (In Russian).
17. Khudyakov, M.A., Muftakhov, M.Kh., Berdin, V.K., Zakirnichnaya, M.M. The influence of a segregation streamer on stress distribution in a pipe wall. Neftegazovoe Delo, 2006, 2, 68. (In Russian). Available at: http://ogbus.ru/files/ogbus/authors/Hudyakov/Hudyakov_1.pdf
18. Makarenko, V.D., Vinnikov, Yu.L., Nogina, A.M., and Petrenko, O.O. Research of the microstructure of the welding doped molybdenum on steel 20K. Problemy Tertya ta Zashuvannya, 2020, 1 (86), 98–107. (In Ukrainian). DOI: 10.18372/0370-2197.1(86).14496.
19. Fedoseeva, E.M. Influence of structure and nonmetallic inclusions on properties of welded seams from Kh65 steel. Vestnik PNIPU, 2015, 17 (4), 76–87. (In Russian). DOI: 10.15593/2224-9877/2015.4.06.
20. Polevoy, E.V., Kozyrev, N.A., Shevchenko, R.A., and Usoltsev, A.A. Study of non-metallic inclusions composition in rail joints welded seams, obtained at their contact arc welding. Chernaya Metallurgiya, 2020, 76 (3), 251–256. (In Russian). DOI: 10.32339/0135-5910-2020-3-251-256.

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