20.500.12556/RUL-181323 Študija toplotnih razmer pri laserskem razrezu kovinskih materialov diplomsko delo Study of thermal conditions during laser cutting of mettalic materials diploma work Namen diplomskega dela je bil izdelati vzorce iz nerjavnega jekla X2CrNi18-9, aluminijeve zlitine AW1050 H24 ter medi CuZn37 s postopkom laserskega razreza z uporabo optičnega laserskega žarka. V delu je opisan postopek uporabe laserske naprave za razrez in njeno delovanje, ter teoretične osnove optičnega laserskega žarka. Za vsak material sta bila izdelana 2 vzorca, pri tem je bil parameter hitrosti razreza za drugi izdelan vzorec enak in je znašal 5000mm/min. Na vzorcih je bilo izvedeno merjenje zunanjih dimenzij, ter analiza makrostrukture in mikrostrukture. Za uspešno izvedbo mikrostrukturne analize je bil uporabljen postopek vrstične elektronske mikroskopije (SEM) in energijske disperzijske spektroskopije rentgenskih žarkov (EDS). Ugotovljeno je bilo, da je postopek laserskega razreza z uporabo optičnega žarka eden vodilnih postopkov obdelave valjane pločevine. Uporaba optičnega laserskega žarka pa je med procesom povzročila spremembe na obdelovanih zlitinah, kjer smo opazovali nastanek striacij na makrostrukturi in pojav toplotno vplivane cone v mikrostrukturi materiala. Tip zlitine in vhodni parametri laserskega razreza so imeli velik vpliv na obliko, velikost in lastnosti nastalih striacij in toplotno vplivane cone. Pri analizi mikrostrukture izdelanih vzorcev je bilo ugotovljeno, da manjša hitrost razreza, ki je bila uporabljena pri razrezu vzorcev, poslabša kvaliteto in obliko striacij, prav tako pa je imela negativen vpliv na širino in lastnosti toplotno vplivane cone. The purpose of the diploma thesis was to successfully manufacture samples from stainless steel X2CrNi18-9, aluminium alloy AW1050 H24, and brass CuZn37 using the laser cutting process with an optical laser beam. The procedure of using the fiber laser cutting device and its operation, along with the theoretical principles of the optical laser beam were described. Two samples were produced for each material, where the cutting speed parameter for the second sample was set at 5000 mm/min. Measurements of external dimensions, as well as macrostructure and microstructure analyses were performed on the manufactured samples. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used for the successful execution of the microstructure analysis. It was found that the laser cutting process using an optical beam is one of the leading processes for processing rolled sheet metal and is widely used in industry. However, the use of an optical laser beam caused changes in the processed alloys during the process, where the formation of striations was observed in the macrostructure and the appearance of a heat-affected zone in the microstructure of the material. The type of processed alloys and the input laser cutting parameters had a significant influence on the shape, size, and properties of the resulting striations and the heat-affected zone. The microstructure analysis of the manufactured samples revealed that a lower cutting speed deteriorated the quality and shape of the striations and also had a negative effect on the width and properties of the heat-affected zone. laserski razrez toplotna analiza toplotno vplivana cona SEM laser cutting thermal analysis heat-affected zone SEM true false false P. Ulčar Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-04-01 09:00:10 2026-04-01 09:00:38 2026-04-02 10:48:02 0000-00-00 00:00:00 2026 0 Ljubljana 0 Ljubljana XIII, 52 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 113519 273997827 29022.pdf 29022.pdf 1 20FA97E0C70E3A69041F14D20E16E3EB 97299bbaf08a47fb7500f2a6dba0d4abda8a2704510eb576bde713976a53a514 5543cc94-2d98-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231686 29023.pdf 29023.pdf 1 D98B8E2C054C2AAA5E248A36D813D368 69b24343691c7885a2efdf76c354bcee1cdceaeb095f7f60d2fce73d482d8262 5544b04d-2d98-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231687 29024.pdf 29024.pdf 1 8654CA46B3F40E1E234E2ABAB772E501 d6ecb4970fbae8ee9dcfa800ff3d23a530267b0b2407fb0089bdcb37ada53e3a 55460fd2-2d98-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231688 29025.pdf 29025.pdf 1 6ACCB68A2101113A8870F4A58C874B29 dfdbc2354aa5cde356091e9ed5928415ee53c7b4b72742532ae69a5835a4ed68 55465b45-2d98-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231689 Naravoslovnotehniška fakulteta 0 0 0