Obrabotka Metallov 2019 Vol. 21 No. 2

OBRABOTKAMETALLOV Vol. 21 No. 2 2019 51 TECHNOLOGY References 1. Nandan R., Debroy T., Bhadeshia H.K.D.H. Recent advances in friction-stir welding – process, welding struc- ture and properties. Progress in Materials Science , 2008, vol. 53 (6), pp. 980–1023. 2. Stephen Leon J.L., Jayakumar V. Investigation of mechanical properties of aluminium 6061 alloy friction stir welding. American Journal of Mechanical Engineering and Automation , 2014, vol. 1, no. 1, pp. 6  9. 3. Suman P., Srinivasa Rao P., Sreeramulu D. A survey on friction stir welding of dissimilar magnesium al- loys. International Journal of Scientific Research and Review , 2019, vol. 8, iss. 1, pp. 26–38. DOI: 10.13140/ RG.2.2.11026.91844. Application for the Way of Ultrasonic Assistance Input and Estimation of its Efficiency for Friction Stir Welding of Aluminum Alloys Alexey Ivanov а, * , Vladimir Beloborodov b , Vladimir Krasnoveikin c , Valery Rubtsov d , Evgeny Kolubaev e Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation а http://orcid.org/0000-0001-8959-8499, ivan@ispms.tsc.ru, b http://orcid.org/0000-0003-4609-1617, vabel@ispms.tsc.ru, c http://orcid.org/0000-0003-1405-0597, volodia74ms@yandex.ru , d https://orcid.org/0000-0003-0348-1869, rvy@ispms.ru e http://orcid.org/0000-0001-7288-3656, eak@ispms.tsc.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2019 vol. 21 no. 2 pp. 40–52 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2019-21.2-40-52 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 18 March 2019 Revised: 17 April 2019 Accepted: 04 May 2019 Available online: 15 June 2019 Keywords : Friction stir welding Ultrasonic assistance Laser Doppler vibrometry Aluminum alloy 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. Manufacturing capabilities of friction stir welding has some restrictions caused by the formation of welding defects, the alteration in material structure and the appearance of residual stresses that results in worsening of utilization properties of welded joints. A well-known method for improvement of welded joint properties is an input of ultrasonic assistance by different ways during the welding process. However, the application of known ways of the input either requires a complex technique or accompanied by a significant power loss and an attenuation of ultrasonic oscillation. The way for the input of the ultrasonic assistance using a sonotrode fixation on a weld material is seemed to be promising since it has no requirements for a complex technique and provides an effective transmission of the oscillation into the joint formation zone. Goal of this research is the estimation of efficiency of the ultrasonic assistance way, in which the sonotrode fixation is used, by a measuring of the intensity of resulting oscillations and an estimation of its effect on a tensile strength of welded joints obtained by the friction stir welding. Results and discussion. The comparison of two ways of ultrasonic oscillation input is carried out by the means of laser Doppler vibrometry. It’s shown that the way of input using the sonotrode fixation is more effective that the contact one. The way proposed with much less power input provides 2.5-4.0 times higher intensity of oscillation all over the volume of material not depending of a distance to the point of the oscillation input. Tensile tests of the 2024 alloy samples of joints obtained by friction stir welding demonstrated that the input of ultrasonic oscillation during the welding process results in 10-13% increase of tensile strength. Herewith, the maximum tensile strength achieved 92% of bulk metal. Also it’s shown that the input of ultrasonic oscillation during the welding process results in strength increasing of material in a stir zone for joints with 2.5 and 5.0 mm thickness and results in reinforcement of a thermomechanically affected zone for joints with 10.0 mm thickness. For citation: Ivanov A.N., Beloborodov V.A., Krasnoveikin V.A., Rubtsov V.E., Kolubaev E.A. Application for the way of ultrasonic assistance input and estimation of its efficiency for friction stir welding of aluminum alloys. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2019, vol. 21, no. 2, pp. 40–52. DOI: 10.17212/1994-6309-2019-21.2-40-52. (In Russian). ______ * Corresponding author Ivanov Alexey N., Junior researcher Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Science, 2/4 pr. Akademicheskii, Tomsk, 634055, Russian Federation Tel.: 8 (382) 228–68–63, e–mail: ivan@ispms.tsc.ru