20.500.12556/RUL-119446 Popravilo glave motorja z varjenjem TIG Cylinder head repair with TIG welding V diplomskem delu so najprej predstavljene teoretične osnove in pravila varjenja aluminija in aluminijevih zlitin. Opisano je tudi varjenje TIG in metode ter načini preizkušanja kakovosti zvarov. Ker se v realnosti pogosto pojavljajo težave pri varjenju aluminijevih zlitin, smo v tem diplomskem delu predstavili navodila za popravilo ulitkov iz aluminijevih zlitin. Dokazali smo, da upoštevanje pravil omogoča izdelavo kakovostnega reparaturnega popravila brez napak oz. zvara z minimalnimi dopustnimi napakami. Eksperimentalni del sem izvedel na praktičnem primeru glave avtomobilskega motorja. Pri izvedbi praktičnega preizkusa smo glede na osnovni material in varjenec ustrezno izbrali varilno opremo in varilne parametre, ter ustrezno pripravili varjenec. Pri tem pa smo ugotovili, da ob upoštevanju predhodno znanih lastnosti in pravil glede varjenja aluminijevih zlitin lahko izdelamo kakovostno popravilo. Na izdelanih zvarnih spojih smo izvedli vizualno kontrolo in kontrolo s penetranti. V zvarih se niso pojavile razpoke, našli pa smo minimalno poroznost. Tako popravljena glava motorja je bila še mehansko obdelana in vgrajena v motor, kjer se je izkazalo, da je bilo popravilo uspešno. The final thesis describes the basic rules and theory on welding aluminium and aluminium alloys. TIG welding and weld analysis procedures are described next. When welding aluminium and aluminium alloys, we often encounter different issues, which results in low quality of welds. We presumed that by following a particular set of theoretical rules, we can improve the weld quality with a minimal amount of welding defects. This was proven to be true on a case of cylinder head from an automobile engine. We properly prepared a welding piece and chose the correct welding equipment and parameters based on the welding material and theoretical recommendations. We proved that by following a particular set of rules, a high quality weld can achieved, without any weld cracks. However, the repaired piece had minimal but acceptable quantity of porosity. The quality of welds was proven by visual inspection and dye penetration tests. After the welding, the cylinder head was machined and mounted back into the engine block. The quality of repair work was confirmed the quality by successful running the engine. aluminij aluminijeve zlitine glava avtomobilskega motorja TIG varjenje priprava varjenca poroznost dodajni material analiza zvara aluminium aluminium alloys cylinder head TIG welding welding preparation porosity filler wire weld analysis true false false [M. Pirš] Slovenski jezik Angleški jezik Zaključna naloga 2020-09-09 08:30:26 2020-09-09 08:30:31 2022-08-31 03:53:08 0000-00-00 00:00:00 2020 0 Ljubljana 0 XV, 38 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669.715:621.791.75(043.2) 223938 28399619 5769.pdf 5769.pdf 1 6C919090D0B153A65090DEE67186349A 9b409c0b57f408af30da5022e6033a13d5ea02ebcda8a448918c62c2d121f125 d46bc072-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=134157 Fakulteta za strojništvo 0 0 0