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The paper presents the results of an analysis of the influence of technological parameters of pneumatic shot peening technology on the selected properties of a surface layer of butt joints made with Friction stir welding (FSW) method. Butt joints made of two 2024 – T3 aluminum alloy sheets with the thickness of 1 mm were shot peened with glass beads. The experiments were carried out according to the statistical 3-level completed plan PS/DC 32. Technological parameters were changed in the range: pressure p = 0.4 – 0.6 MPa and peening time t = 1-3 min. As a result of the conducted research, adequate equations describing the effect of the analyzed parameters on the surface roughness were obtained. Shot peening with glass beads reduced significantly the surface roughness from Ra = 5.2 µm to Ra = 1.42 µm. This treatment provides high compressive residual stresses and the increase of the surface layer hardness. The results show that shot peening is a highly efficient and cost-effective mechanical treatment used for improving mechanical properties of butt joints made with FSW method.

Friction stir welding (FSW) is a solid state joining process used to join metals and their alloys. The main goal of this paper is to select the optimal welding parameters such as: rotational speed and the feed rate of the tool. The article presents the results of the tests on welding 1mm thick 2024 aluminum sheet according to the statistical 3-level completed plan PS/DK32. The rotational speed of the tool varied within the range of 1100 ÷ 1300 rpm and the feed rate within the range of 40 ÷ 60 mm/min. For these parameters the analyses of the experiment repeatability, impact significance and adequacy of equations were made.