Moscow Polytechnic University (Moscow, Russia)
R. А. Latypov, Professor of the Department of Equipment and Technology of Welding Production, Doctor of Technical Sciences, Professor, latipov46@mail.ru
К. А. Greshilov, Postgraduate Student of the Department of Equipment and Technology of Welding Production, greshilov.kirill@yandex.ru
G. R. Latypova, Associate Professor of the Department of Equipment and Technology of Welding Production, Candidate of Technical Sciences, Associate Professor, g.r.latypova@mospolytech.ru
V. B. Deev, Head of the Department of Equipment and Technology of Welding Production, Doctor of Technical Sciences, Professor, deev.vb@mail.ru
The properties of welded joints of AMg3 alloy produced using a handheld friction stir spot welding (FSSW) tool have been investigated. A method for determining the cross-sectional area of a weld spot has been developed. The method involves processing photographs of specimens after testing using CAD systems, which improves the accuracy of determining the weld-spot cross-sectional area and significantly reduces the time required for measurements and calculations.A rational friction stir spot welding mode for AMg3 alloy using a handheld tool has been determined. It has been established that the strength of the joint produced under the rational welding mode is 151–174 MPa, which is approximately 86% of the ultimate tensile strength of the AMg3 alloy in its initial condition. The macrostructure of the weld spot cross-section and the results of its tomographic examination are presented. It has been shown that no defects such as pores, cracks, or discontinuities are present in the joint zone. The metallographic and tomographic examination results are found to correlate well with each other. The weld spot is found to have an elongated oval shape with a clearly defined boundary. Its length is 7.0 mm and its width is 5.06 mm. The specimen thickness in the zone affected by the tool shoulder is 3.96 mm, while the depth of the technological indentation produced by the tool pin is 3.15 mm and its diameter is 3.12 mm. It has been established that the microhardness of the base metal and the joint zone differ only slightly. At the same time, the microhardness of the welded joint zone is somewhat higher than that of the base metal, which can be attributed to work hardening caused by the mechanical action of the FSSW tool on this zone during welding. The potential of the developed experimental compact device for friction stir spot welding of aluminum and its alloys parts with thicknesses of up to 3.0 mm has been demonstrated.
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