Concept of determining the friction stir welding mode

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Authors:

І. О. Vakulenko, Dr. Sc. (Tech.), Prof., orcid.org/0000-0002-7353-1916, Dnipropetrovsk National University named after Academician V. Lazaryan, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S. О. Plitchenko, orcid.org/0000-0002-0613-2544, Dnipropetrovsk National University named after Academician V. Lazaryan, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

N. H. Murashova, orcid.org/0000-0003-2758-0749, Dnipropetrovsk National University named after Academician V. Lazaryan, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V. N. Bohomaz, Cand. Sc. (Phys.-Math.), orcid.org/0000-0001-5913-2671, Dnipropetrovsk National University named after Academician V. Lazaryan, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. To determine the optimal mode of friction stir welding of aluminum alloy.

Methodology. 2.5 mm thick plates made of aluminum alloy AMg5 with chemical content of alloying elements within grade composition were used as a material for the research. Friction stir welding was carried out using specially designed equipment with a preselected form and dimensions of working tool. At different ratios of the working tool rotation frequency the forces of pressing and speed of its movement along the connecting edges determined the metal heating degree and the quality of welded joint formation. Temperature of the connecting edges heating was determined by thermocouples immersed in metal at different distances from the welded joint. Rotational speed of the working tool was from 800 to 1600 min-1with the effort of pressing to the plate surface from 580 to 1370 N and the speed of movement along the joint of 50 mm/min.

Findings. On the basis of different ratios of the working tool rotation speed and pressing to the connecting edges, there were determined conditions for achieving the effect of constant softening during friction stir welding. In order to achieve a high level of welding joint quality during friction stir welding it is necessary to carry out the process at high revolutions of the working tool and low levels of pressing to the connecting edges.

Originality. At the constant speed of the working tool rotation proportional increase in alloy temperature from increasing the level of its pressing to the connecting edges is disturbed by achievement of conditions of the dynamic softening processes development.

Practical value. The concept of choosing the technological parameters of welding process is determined, when it is preferred to increase in speed of the working tool rotation when the level of its pressing to the connecting edges decreases.

References.

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5. Bevilacqua, M., Ciarapica, F. E., D’Orazio, A., Forcellese, A. and Simoncini, M., 2017. Sustainability analysis of friction stir welding of AA5754 sheets. In: 10th CIRP Conference on Intelligent Computation in Manufacturing Engineering – CIRP ICME ‘16 [online], pp. 529–534. Available at: <https://ac.els-cdn.com/S2212827116306990/ 1-s2.0-S2212827116306990-main.pdf?_tid=db5edae2-c482-11e7-98bc-00000aab0f02&acdnat=1510145376_03a49f9adb53342f8d8b9530dfc08aa2> [Accessed 15 October 2017].

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7. Ravi Sankar, B. and Umamaheswarrao, P., 2017. Modelling and Optimisation of Friction Stir Welding on AA6061 Alloy. Materials today: Proceedings, 4(8), pp. 7448‒7456. DOI: 10.1016/j.matpr.2017.07.076.

8. Vakulenko, І. O., Plitchenko, S. О. and Nadezhdin, Yu. L. Dnipropetrovsk National University of Railway Transport named after V. Lazaryan, 2012. The method for welding friction with the mixing of alloys based on aluminum.Ukraine. Pat.75698.

9. Vakulenko, I. A. and Plitchenko, S. A., 2017. Determination activation energy of friction stir welding. In: Welding and Related Technologies: Proceedings 9thInternational Conference of young scientists (23.05‒ 27.05.2017 ). National academy of sciences of Ukraine, Institute of Electric Welding named after E. O. Paton [pdf], рр. 54‒58. Available at: <http://wrtys.com.ua/2017/wpcotent/uploads/Paton_Proceedings_2017_Small_New.pdf> [Accessed 22 October 2017].

10. Dalder, E., Pastrnak, J.  W., Engel, J., Forrest, R.  S., Kokko, E., Mcternan, K. and Waldron, D., 2008. Friction stir welding of thick-walled aluminum pressure vessels [pdf], pp. 40–44. Available at: <https://app.aws.org/www/wj/2008/04/WJ_2008_04.pdf> [Accessed 22 September 2017].

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