20.500.12556/RUL-160860 Analiza zvarnih spojev aluminijevih zlitin izdelanih s potopkom trenja in mešanja Analysis of friction stir welded aluminium alloys joints Aluminij in njegove zlitine se danes v industriji veliko uporabljajo. Razlog za izbiro teh materialov so njihove dobre mehanske lastnosti, majhna gostota, dobra električna in toplotna prevodnost ter dobra korozijska odpornost. V zaključni nalogi smo se osredotočili na postopek varjenja s trenjem in mešanjem, ki se vedno bolj uporablja za varjenje težko varivih materialov. Izvedba varjenja je dokaj enostavna in poceni, mehanske lastnosti zvarnih spojev pa so zelo dobre. V eksperimentalnem delu naloge smo analizirali šest zvarnih spojev, ki so bili zavarjeni z različnimi parametri. Visokotrdnostni aluminijevi zlitini, tipa 7075-T651 in 2017A-T451, uporabljeni pri eksperimentu, sta po običajnih postopkih varjenja težko združljivi. Naredili smo meritve zaostalih napetosti v sredini zvarnega spoja, na začetku in na koncu zvara, v longitudinalni in transverzalni smeri, na temenu in korenu zvara ter izvedli natezne preizkuse za konec in začetek vsakega spoja. Dobljene rezultate smo nato predstavili grafično in v tabelah ter med njimi naredili primerjavo. Na koncu smo rezultate še komentirali in poiskali povezave s posameznimi parametri varjenja. Aluminium and its alloys are widely used in industry today. Their good mechanical properties, low density, good electrical and thermal conductivity, and excellent corrosion resistance are reasons for choosing these materials. In this thesis, we focused on the friction stir welding process, which is increasingly used for welding difficult-to-weld materials. The welding process is relatively simple and cost-effective, and the mechanical properties of the weld joints are very good. In the experimental part of the thesis, we analysed six weld joints that were welded with different parameters. In the experiment, we used high-strength aluminium alloys, types 7075-T651 and 2017A-T451, which are difficult to weld using conventional methods. We measured residual stresses in the middle of the weld joint, at the beginning and at the end of the weld, in the longitudinal and transverse directions, at the crown and root of the weld, as well as performed tensile tests for the beginning and end of each joint. We presented the obtained results graphically and in tables and compared them. Finally, we commented on the results and identified correlations with individual welding parameters. aluminijeve zlitine varjenje z mešanjem zaostale napetosti rentgenska difrakcija natezni preizkus aluminium alloys friction stir welding residual stresses x-ray diffraction tensile test true false false Slovenski jezik Angleški jezik Zaključna naloga 2024-09-05 08:31:33 2024-09-05 08:31:35 2024-11-11 12:13:03 0000-00-00 00:00:00 2024 0 0 XI, 39 f. 2024 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669.715:621.791:531.4(043.2) 265206 214499843 35489.pdf 35489.pdf 1 548E82B223454C5FB895CA1D61451CF0 5750f5dd0c7cb291080ee88fc86267605c021b2a318b8db81c5676d3a2f49c6a 7df7d36d-6b50-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189659 Fakulteta za strojništvo 0 0 0