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2021 №05 (10) DOI of Article
10.37434/as2021.05.11
2021 №05 (01)

Automatic Welding 2021 #05
Avtomaticheskaya Svarka (Automatic Welding), #5, 2021, pp. 70-74

Application of fractal and metallographic analyses for evaluation of quality of welds metal

O.O. Shtofel1, V.V. Holovko1, T.G. Chyzhska2
1E.O. Paton Electric Welding Institute. 11 Kazymyr Malevych Str., 03150 Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2NTUU «Igor Sikorsky Kyiv Polytechnic Institute». 37 Peremohi Prosp., 03056, Kyiv, Ukraine.

When analyzing the factors that determine the mechanical properties of welds, it is necessary to take into account both the size of individual components of the structure and their morphology. It is shown that the use of the method of fractal analysis makes it possible to numerically determine such parameters of weld metal microstructure, as the size of non-metallic inclusions, and branching of grain boundaries, which was impossible at analysis of metallographic images. The results are obtained, which indicate the need to include in the multifractal analysis the characteristics that describe the morphological features of microstructural components, the distribution of non-metallic inclusions by size, and the level of doping of the solid solution. Research directions for the development of multifractal analysis of welded joints have been identified. 10 Ref., 2 Tabl., 6 Fig.
Keywords: metal of welded joints, fractal and metallographic analyses, structural parameters, mechanical characteristics


Received:30.03.2021

References

1. Shtofel, O., Golovko, V., Chyzhska, T. (2021) Fractal and metallographic analyses as an innovation in ensuring the quality of metal products. Innovative «Approaches to Ensuring the Quality of Education, Scientific Research and Technological Processes». Wydawnictwo Wyższej Szkoły Technicznej w Katowicach, 1013-1018. (ISBN 978-83-957298-6-7).
2. Kirichenko, L.O., Radivilova, T.A. (2019) Fractal analysis of self-similar and multifractal hour series. Kharkiv, Kh-NURE [in Ukrainian].
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6. Shtofel, O.O. (2019) Application of fractal analysis method to study the metal structure. Metalozn. Obrobka Met., 91(3), 40-46 [in Ukrainian]. https://doi.org/10.15407/mom2019.03.040
7. Shtofel, O.O., Chizhskaya, T.G, Kulieznova, S.S. (2020) Metallographic studies of vessel steel samples: DS, 35G/40G and steel 20 by fractal analysis. J. of Multidisciplinary Engineering Sci. Studies (JMESS), 6, 2. ISSN: 2458-925X
8. Shtofel, O.O., Rabkina, L.M. (2019) Application of fractal analysis method to study the change of metal properties. Visnyk KPI, Seriya Pryladobuduvanniya, 58(2) [in Ukrainian]. ISSN (Online) 2663-3450, ISSN (Print) 0321-2211 https://doi.org/10.20535/1970.58(2).2019.189335
9. Holovko, V.V.,Kuznetsov, V.D., Fomichov, S.K., Loboda, P.I. (2016) Nanotechnologies in welding of low-alloy highstrength steels. Kyiv, Politekhnika [in Ukrainian].
10. Poyarkova, E.V. (2019) Fractal analysis in diagnostics of the structures of materials: Procedural recommendations. Orenburg, Orenb. State University [in Russian].

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