20.500.12556/RUL-186682 Merjenje zvarnih stikov in topografije lasersko izdelanih zvarnih spojev z uporabo optične koherentne tomografije Measurement of joint geometry and topography of laser-welded joints using optical coherence tomography V diplomski nalogi je bila raziskana možnost uporabe optične koherentne tomografije (OCT) za brezkontaktno in nedestruktivno merjenje geometrije ter topografije zvarnih spojev pri laserskem varjenju. Namen raziskave je bil preveriti uporabnost OCT pri različnih geometrijah zvarov ter vpliv merilnih in obdelovalnih parametrov na kakovost rezultatov. Meritve so bile izvedene s sistemom OCT na vzorcih iz konstrukcijskega jekla, pri čemer so bili obravnavani površinski in kotni točkasti vari ter notranji in zunanji kotni vari. Analizirani so bili vplivi vpadnega kota, parametrov skeniranja in obdelave podatkov. Rezultati so pokazali pomemben vpliv geometrije zvara, vpadnega kota in obdelave podatkov na kakovost rekonstrukcije. Pri kompleksnejših geometrijah so se pojavili predvsem lažni odboji, sence in območja brez merilnih podatkov. Ugotovljeno je bilo tudi, da manjša gostota lateralnega vzorčenja povzroča navidezne strukture na rekonstruirani površini. OCT se je izkazal kot uporabna metoda za nedestruktivno karakterizacijo površine zvarnih spojev, vendar je treba za zanesljive rezultate merilne parametre prilagoditi posamezni geometriji zvara. This thesis investigates the use of optical coherence tomography (OCT) for non-contact and non-destructive measurement of the geometry and surface topography of welded joints in laser welding. The aim of the study was to evaluate the applicability of OCT to different weld geometries and to determine the influence of measurement and data-processing parameters on the quality of the results. Measurements were performed using an OCT system on structural steel samples, including surface and corner spot welds as well as internal and external corner welds. The effects of the angle of incidence, scanning parameters, and data processing were analysed. The results showed that the weld geometry, angle of incidence, and data processing have a significant influence on the quality of the reconstructed geometry. In more complex geometries, false reflections, shadows, and areas with missing measurement data were observed. It was also found that a lower lateral sampling density can produce artefactual structures on the reconstructed surface. OCT proved to be a useful method for the non-destructive characterisation of the surface of welded joints; however, reliable results require the measurement parameters to be adapted to the geometry of the individual weld. optična koherentna tomografija lasersko varjenje zvarni spoji topografija površine nedestruktivno merjenje parametri obdelave podatkov Brewsterjev kot optical coherence tomography laser welding welded joints surface topography non-destructive measurement data processing parameters Brewster’s angle true false false [M. Leskovar] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-04 08:30:41 2026-09-04 08:30:45 2026-09-05 04:33:56 0000-00-00 00:00:00 2026 0 Ljubljana 0 XII, 44 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.725:535.8(043.2) 289179 290078979 48986.pdf 48986.pdf 1 03617DEFCC467FAECA5BB9731A889361 4b88af95da32e0c38112cf36ed52d6f4eb3aba3e9771eb3f392cd1c8b504f74a 282d342b-a82a-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246004 Fakulteta za strojništvo 0 0 0