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Lasersko navarjanje orodnih jekel
Zuljan, Vid (Author), Klobčar, Damjan (Mentor) More about this mentor... This link opens in a new window, Tušek, Janez (Co-mentor)

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Abstract
Lasersko navarjanje je odlična dopolnitev klasičnih tehnik reparaturnega navarjanja. Ključna prednost je zmožnost mikronavarjanja z majhno toplotno vplivano cono. Lasersko navarjanje je tako primerno za materiale, ki so občutljivi na toplotne spremembe. Temeljni namen diplomskega dela je bil ugotoviti katere oblike pulza reparaturnega laserskega navarjanja so primerne za navarjanje na orodna jekla:1.2311, 1.2312, 1.2343, 1.2344, 1.2767, 1.2379, 1.2550. Zasnovali smo raziskavo, s katero smo želeli ugotoviti povezavo med obliko pulza laserskega navarjanja in obliko navara in čim bolj nazorno prikazati potek trdot na prerezu navara. Raziskavo smo izpeljali z metodo glavnih komponent in z analizo podatkov v programu Surfer. Z analizo glavnih komponent smo ugotovili povezavo med obliko pulza laserskega navarjanja in obliko navara, kar omogoča lažjo izbiro primernih oblik za reparaturno lasersko navarjanje na izbranih orodnih jeklih. Z barvnimi grafičnimi prikazi trdot smo nazorno prikazali potek trdot na prerezu navara. Po pregledu grafov trdot smo ugotovili, da bi bilo smiselno narediti še grafe gradientov trdote. Gradienti trdot so najvišji, kjer sta na slikah struktur navarov vidni razpoki. Zato domnevamo, da oblike pulza, ki ustvarjajo velike trdotne gradiente, niso primerne za reparaturno lasersko navarjanje orodnih jekel.

Language:Slovenian
Keywords:vlakenski laserji, navarjanje, orodna jekla, metoda glavnih komponent, analiza trdote
Work type:Final paper (mb12)
Tipology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2019
Publisher:[V. Zuljan]
Number of pages:XV, 44 f.
UDC:621.791.053:669.14(043.2)
COBISS.SI-ID:16733211 This link opens in a new window
Views:527
Downloads:278
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Secondary language

Language:English
Title:Laser Weld Surfacing of Tool Steels
Abstract:
Laser weld surfacing with wire is an excellent complement of conventional repair clad-welding techniques. The key advantage is the ability to produce a small weld cladding with a small heat-affected zone. Laser weld surfacing is therefore suitable for materials that are sensitive to thermal changes. The main purpose of the diploma work was to determine which shape of the pulse of laser cladding is suitable for clad-welding on the following tool steels: 1.2311, 1.2312, 1.2343, 1.2344, 1.2767, 1.2379, 1.2550. In a planned study, a correlation between the shape of the laser beam pulse and the shape of the weld cladding, hardness and hardness gradients were determined. The research was done using the principal component analysis and by analysing data with program named Surfer. By analysing the principal components, we established the correlation between the shape of the laser beam pulse and the shape of the weld cladding, which makes it easier to choose the suitable shape of the laser beam pulse on the selected tool steels. Using color graphic representations of hardness we showed the hardness of the cross-section of the clad-weld. After reviewing the hardness graphs we found that it would be useful to make graphs of hardness gradient. The gradients are the highest where cracks are visible on images of weld claddings. Thus, our conclusion is that pulses that generate large hardness gradients are not suitable for laser clad-welding on tool steels.

Keywords:fiber lasers, weld surfacing, tool steels, principal component analysis, hardness analysis

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