20.500.12556/RUL-139506 Vpliv tehnoloških parametrov varjenja s trenjem in mešanjem na lastnosti zvarnega spoja aluminijeve zlitine AA5083 Effect of welding parameters of friction stir welding on the properties of the welded joint of aluminium alloy AA5083 V industriji se kaže stalen trend uporabe izdelkov izdelanih iz različnih materialov. Posamezne sestavne dele lahko spajamo na različne načine, vendar je varjenje pomemben postopek spajanja aluminijevih zlitin. Eden od izzivov varjenja pa je izbira ustreznih varilnih parametrov za doseganje željene kakovosti zvarnega spoja. V diplomskem delu smo izdelali in analizirali varjenje aluminijeve zlitine 5083-O s postopkom FSW. Izdelali smo zvarne spoje, kjer smo spreminjali hitrost varjenja od 190 mm/min do 380 mm/min, pri konstantni hitrosti vrtenja orodja. Najprej smo zvarne spoje vizualno ocenili in pripravili epruvete za natezni preizkus. Izmerili smo mehanske lastnosti z nateznim preizkusom in analizirali lomno površino zvarnega spoja. Nato smo izdelali makro obruse, analizo mikrostrukture in primerjali zapolnjevanje špranje obeh izvedb vara. Spreminjanje varilne hitrosti je imelo minimalen vpliv na mehanske lastnosti. To je bilo opazno v manjši natezni trdnosti zvarnega spoja izdelanega z večjim vnosom toplote. Povprečna natezna trdnost zvarnih spojev je od osnovnega materiala manjša za manj kot 10 % (20 – 30 MPa), raztezek pa se je zmanjšal za 1 do 2 %. Zapolnjevanje zvarnega spoja je pri obeh izvedbah vara pokazalo dobre, ponavljajoče rezultate. Opazovana mikrostruktura dobljena pri različnih varilnih hitrosti se ni razlikovala. There is a continuing trend in the industry to use parts made from a combination of different materials. These components can be joined in a variety of ways, but the main joining process for aluminium alloys is welding. However, one of the problems of welding is still the selection of the appropriate welding parameters to achieve the desired weld quality. In this thesis, the welding of aluminium alloy 5083-O by FSW was designed and analysed. Welded joints were produced where the welding speed was varied from 190 mm/min to 380 mm/min, at a constant tool rotation speed. First, the welded joints were evaluated visually and weld samples were prepared for tensile testing. The mechanical properties were measured by tensile testing and the fracture surface of the welded joint was analysed. Then macro contours were made, microstructure analysis was carried out and the gap filling of the two weld designs was compared. The variation of the welding speed had a minimal effect on the mechanical properties, which was observed in the lower tensile strength of the welded joint welded with higher heat input. The average tensile strength of the welded joints is less than 10% lower than the base material and the elongation is reduced by 1 to 2%. Filling of the weld joint showed good, repeatable results for both weld designs. The observed microstructure did not differ between the different welding speeds. varjenje z trenjem in mešanjem – FSW aluminijeve zlitine natezni preizkus lomne površine mikroskopiranje mikrostruktura friction stir welding – FSW aluminum alloys tensile test fracture surfaces microscopy microstructure true false false [T. Tomšič] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2022-09-03 08:30:54 2022-09-03 08:30:59 2023-10-13 08:58:34 0000-00-00 00:00:00 2022 0 Ljubljana 0 XXIV, 58 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791:669.715(043.2) 244066 123337731 17604.pdf 17604.pdf 1 D532563A20F80135B2A6086746A92D46 763a95d946262dbda64809758e6908741eb13e2fbcaab73427cb14b598cf20dc ee5ac36f-2b51-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=160077 Fakulteta za strojništvo 0 0 0