20.500.12556/RUL-176363 Navarjanje aluminijevega brona z ročnim laserjem Handheld laser surfacing of aluminium bronze Diplomska naloga obravnava postopek navarjanja aluminijevega brona CuAl8Ni6 na orodno jeklo 1.2312 z uporabo ročnega vlakenskega laserja. V teoretičnem delu so predstavljene osnove laserske tehnologije ter lastnosti uporabljenih materialov. Eksperimentalni del je vključeval izdelavo treh serij navarov z različnimi varilnimi parametri, optično mikroskopijo, določitev deleža poroznosti in stopnje razmešanja ter meritve trdote po Vickersu. Rezultati so pokazali, da visoka toplotna obremenitev povečuje nastanek razpok in martenzitne strukture v toplotno vplivani coni, medtem ko znižanje vnosa toplote odpravlja razpoke, znižuje stopnjo razmešanja in maksimalno trdoto v toplotno vplivani coni. Predgrevanje osnovnega materiala na 250 $ˆ°$C je zmanjšalo trdoto v toplotno vplivani coni, vendar ni preprečilo nastanka razpok. Najnižja stopnja razmešanja in najnižja trdota v toplotno vplivani coni sta bili doseženi z zmanjšanjem vnosa toplote, pri čemer je višina navara ostala primerljiva z drugimi serijami kljub manjši hitrosti podajanja varilne žice. The thesis examines the process of depositing aluminium bronze CuAl8Ni6 onto tool steel 1.2312 using a handheld fiber laser. The theoretical part presents the fundamentals of laser technology and the properties of the materials used. The experimental part included the production of three series of deposits with different welding parameters, optical microscopy, determination of porosity percentage and dilution rate, as well as Vickers hardness measurements. Results showed that high thermal input increases the formation of cracks and martensitic structures in Heat Affected Zone while reducing the dilution rate. Reducing the heat input eliminated cracks, lowered the dilution rate, and decreased maximum hardness. Preheating the base material to 250 $ˆ°$C reduced the hardness in the heat-affected zone but did not prevent crack formation. The lowest dilution rate and lowest hardness in the heat-affected zone were achieved with reduced heat input, while the deposit height remained comparable to that of other series despite the lower wire feed speed. lasersko navarjanje aluminijev bron CuAl8Ni6 orodno jeklo 1.2312 poroznost razpoke trdota laser cladding aluminium bronze CuAl8Ni6 tool steel 1.2312 porosity cracks hardness true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-11-28 08:30:25 2025-11-28 08:30:29 2025-12-20 04:05:54 0000-00-00 00:00:00 2025 0 0 XX, 50 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.72:669.35(043.2) 279822 261588227 46363.pdf 46363.pdf 1 622F6B74048F987EFA03CB54961AFFA2 a8a98c7faf787a563d011a3677ea01774391a78bf45a423e75d14903e358dfb5 c509a99e-cc2b-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222670 Fakulteta za strojništvo 0 0 0