20.500.12556/RUL-119462 Lasersko navarjanje nitriranega orodnega jekla Laser weld surfacing of nitrided tool steel Diplomska naloga obravnava poroznost lasersko izdelanih navarov na površinah nitriranih orodij. Naloga zajema pregled literature na teme laserskega varjenja in navarjanja ter odpravljanja poroznosti pri navarjanju nitriranih površin. Izdelan je načrt eksperimentov laserskega navarjanja ob uporabi dodajnih materialov z različno vsebnostjo titana, ki naj bi preprečeval nastanek poroznosti. Na vzorcih so bili izdelani obrusi in na njih narejena optična mikroskopija, mikroskopija SEM in analiza kemične sestave. Ugotovili smo, da na količino poroznosti vpliva globina pretalitve osnovnega materiala in količina titana v dodajnem materialu. Poroznost v zvaru smo zmanjšali pod 1 % celotne površine zvara s 5,87 % titana v dodajni žici. Rezultati kažejo, da lahko ob primerni izbiri parametrov in tehniki varjenja podobne rezultate dosežemo že z več kot 0,6 % titana v dodajnem materialu. The bachelor thesis deals with the porosity of laser surfacing welds on surfaces of nitrided tools. The thesis includes the survey of literature on the subject of laser welding, weld surfacing, and eliminating porosity in the weld surfacing of nitrided surfaces. A plan of experiments in weld surfacing is made, demonstrating how the use of filler materials containing various amounts of titanium, should prevent porosity. Macro etch specimens were prepared, and an optic microscopy, as well as SEM microscopy, and analysis of chemical structure were performed upon them. We found out that the amount of porosity is influenced by the melt depth of the base material and the amount of titanium in the filler material. The porosity in the weld was reduced under 1% of the whole surface of the weld, with 5,87% of titanium in the filler wire. Results demonstrate that with an adequate choice of parameters and an adequate technique of welding, similar results can be achieved with more than 0.6% of titanium in the filler material. lasersko navarjanje titan orodno jeklo nitracija poroznost laser weld surfacing titanium tool steel nitridation porosity true false false [R. Lenaršič] Slovenski jezik Angleški jezik Zaključna naloga 2020-09-09 08:31:35 2020-09-09 08:31:37 2022-08-31 03:53:12 0000-00-00 00:00:00 2020 0 Ljubljana 0 XIV, 29 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.725:669.14:669.295(043.2) 223946 28342275 6120.pdf 6120.pdf 1 77A39BC3C086538D35AD0AB5C046D9C7 6bccf5bd9b2d2e5190f79edd56aaedbc458ec4bc5dc0fd1d2921cbd305a9d816 d593fb4a-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=134174 Fakulteta za strojništvo 0 0 0