Kalashnikova T.A., Kalashnikov K.N. 2019 Vol. 21 No. 4

OBRABOTKAMETALLOV Vol. 21 No. 4 2019 92 MATERIAL SCIENCE References 1. Tarasov S.Yu., FilippovA.V., Kolubaev E.A., Kalashnikova T.A. Adhesion transfer in sliding a steel ball against an aluminum alloy. Tribology International , 2017, vol. 115, pp. 191–198. DOI: 10.1016/j.triboint.2017.05.039. 2. Tarasov S.Yu., Rubtsov V.E., Kolubaev E.A. A proposed diffusion-controlled wear mechanism of alloy steel friction stir welding (FSW) tools used on an aluminum alloy. Wear , 2014, vol. 318, no. 1, pp. 130–134. DOI: 10.1016/j. wear.2014.06.014. 3. Mishra R.S., Ma Z.Y. Friction stir welding and processing. Material Science and Engineering: R , 2005, vol. 50, no. 1, pp. 1–78. DOI: 10.1016/j.mser.2005.07.001. Structure and Properties of Copper Compensator Joints obtained by Hybrid Friction Stir Welding Technology Tatiana Kalashnikova 1, a , Kirill Kalashnikov 1, b, * , Mikhail Shvedov 2, с , Petr Vasilyev 2, d 1 Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Science, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation 2 I. N. Ulianov Chuvash State University, 15 Moskovsky Prospekt, Cheboksary, 428015, Russian Federation a https://orcid.org/0000-0002-0388-4011 , gelombang@ispms.tsc.ru , b https://orcid.org/0000-0002-0286-7156, kkn@ispms.tsc.ru , c https://orcid.org/0000-0002-5735-6134, shved1951@rambler.ru , d http://orcid.org/0000-0002-5147-6266, svarkacheb@yandex.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2019 vol. 21 no. 4 pp. 85–93 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2019-21.4-85-93 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 15 September 2019 Revised: 14 October 2019 Accepted: 15 October 2019 Available online: 15 December 2019 Keywords : Friction stir welding Copper compensator Weld structure Mechanical properties Funding This work is performed within the frame of the Fundamental Research Program of the State Academies of Sciences for 2013-2020, line of research III.23. ABSTRACT Introduction. Special copper compensators are used to compensate for temperature expansion, vibrations and the resulting dangerous deformations on power live conductors. Application of compensators for current-carrying elements allows to increase reliability, durability and safety of power electrical devices operation. However, now for compensators manufacturing the technology of the manual soldering is used, which lacks are low productivity, the limited sizes of received products, and also dependence of products quality on the personnel qualification. In this connection, the actual task is to develop new promising methods of obtaining copper compensators. Such methods include friction stir welding. This type of permanent joints formation is widely used in the shipbuilding and automotive industries, production of missile bodies for aerospace, and others. Friction stir welding was developed primarily for the production of permanent joints of thermally hardenable aluminum alloys, but it is also used for welding of thermally non-hardenable aluminum alloys, titanium alloys, steels and copper. Theoretical and experimental studies of friction stir welding of copper demonstrate the high ability of this technology to produce permanent joints from copper and its alloys. The purpose of the present work was to reveal the peculiarities of the structure and mechanical properties of copper compensators produced by friction stir welding. Results and discussions. The carried out researches have shown, that at friction stir welding of copper monolithic plate with copper foil, preliminary connected by soldering in a package, allows to receive a joint without formation of undesirable intermetallic compounds. Solder layers are mixed in the weld, and the distribution of solder in the stir zone is uneven. Microhardness and elemental microanalysis data showed that the retreating side of the joint contains the largest number of solder layers. The structure of the foil package has not changed after welding, so that the conductivity of the material has not changed either. Tensile tests have shown that the compensator is not fractured by the weld, but by successive rupture of the copper foil, which allows the damaged element to be identified in advance. For citation: Kalashnikova T.A., Kalashnikov K.N., Shvedov M.A., Vasilyev P.A. Structure and properties of copper compensator joints obtained by hybrid friction stir welding technology. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2019, vol. 21, no. 4, pp. 85–93. DOI: 10.17212/1994-6309-2019-21.4-85-93. (In Russian). ______ * Corresponding author Kalashnikov Kirill N. , Junior Staff Scientist Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Science, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation Tel.: +7 (913) 883-69-62, e-mail: kkn@ispms.tsc.ru