20.500.12556/RUL-185847 Vpliv kemijske sestave dodajnih materialov na kakovost laserskih zvarnih spojev aluminijevih zlitin Effect of filler material chemical composition on the quality of laser welded joints of aluminium alloys Naloga obravnava vpliv kemijske sestave dodajnega materiala na kakovost pulznih laserskih sočelnih zvarov med ekstrudirano zlitino EN AW-6063 in tlačno litima zlitinama EN ACAlSi9Cu3 oz. EN AC-AlSi10Mg. Primerjani so bili dodajni materiali AlSi12, AlSi5, AlSi7Mg in AlMg5. Kakovost zvarov je bila ocenjena z vizualnim pregledom, radiografsko analizo, metalografijo prečnih prerezov, meritvami mikrotrdote in tlačnim preizkusom tesnosti pri tlaku 6 barov. Rezultati kažejo, da so dodajni materiali z višjim deležem silicija zagotavljali stabilnejši proces in nižjo poroznost. Razpok ni bilo zaznanih pri nobeni preizkušeni kombinaciji, kar pripisujemo predvsem visoki vsebnosti silicija v ulitkih in visoki stopnji razmešanja. Dodatek magnezija je zaradi njegove hlapnosti pri visokih energijskih gostotah povečal brizganje in poroznost. Za obravnavano aplikacijo se je kot najprimernejši izkazal AlSi12, pri čemer je treba upoštevati vpliv razmešanja, geometrije zvarnega stika in osnovnega materiala ulitka. This thesis examines the influence of filler material chemical composition on the quality of pulsed laser butt welds between extruded EN AW-6063 alloy and die-cast EN AC-AlSi9Cu3 or EN AC-AlSi10Mg alloy. The filler materials compared were AlSi12, AlSi5, AlSi7Mg, and AlMg5. Weld quality was assessed by visual inspection, radiographic analysis, metallographic cross-section examination, microhardness measurements, and a pressure leak test at a pressure of 6 bar. The results show that filler materials with a higher silicon content provided a more stable process and lower porosity. No cracks were detected in any of the tested combinations, which was attributed mainly to the high silicon content of the cast alloys and the high dilution ratio. The addition of magnesium increased spatter and porosity due to its volatility at high energy densities. For the application under consideration, AlSi12 proved to be the most suitable choice, with the effects of dilution, joint geometry, and base material of the casting all needing to be taken into account. lasersko varjenje aluminijeve zlitine dodajni materiali kemijska sestava stopnja razmešanja varivost razpoke v vročem poroznost laser welding aluminium alloys filler metals chemical composition dilution ratio weldability hot cracking porosity true false false [K. Rijavec] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-08-21 08:32:30 2026-08-21 08:32:33 2026-08-22 04:19:33 0000-00-00 00:00:00 2026 0 Ljubljana 0 XXII, 64 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.725:669.715(043.2) 288106 288483587 48573.pdf 48573.pdf 1 EC266F4EA5BA106AECE1944CDBD34619 35a573167559fba84de48efa0ada1ef4d209918fddff887857fa6ad34e8faeb5 b39f5067-9d29-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=244836 Fakulteta za strojništvo 0 0 0