Vpliv oblike varilnega roba na nastanek vročih razpok pri laserskem varjenju raznorodnih materialov

Rot, Matic (author), Klobčar, Damjan (mentor)

Raziskava obravnava problem nastanka vročih razpok pri laserskem varjenju raznorodnih materialov, kot sta nikljeva zlitina 2.4816 in nerjavno jeklo 1.4301. Pri nespremenjenih varilnih parametrih, kot so energija bliska, fokusna razdalja, oblika bliska in podajalna hitrost, je analiziran vpliv oblike zvarnega roba in pozicije varjenja na pojav vročih razpok pri izdelavi kotnega zvara. Poleg vročih razpok, analiziranih z mikroskopom, je dodana analiza prečnih prerezov vzorcev, na podlagi katere sta določeni oblika zvarnega prereza in stopnja razmešanja materialov v zvaru ter ovrednoten njun vpliv na pojav razpok. Rezultati kažejo, da ima določena oblika posnetja zvarnega roba manj nepravilnosti v zvaru kot oblika brez posnetja, vendar se je oblika brez posnetja izkazala za najprimernejšo obliko v praksi.

• Language: Slovenian
• Keywords: vroče razpoke, posnetja varinih robov, kotni zvari, razmešanje materiala v zvaru, lasersko varjenje, avstenitna mikrostruktura
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Rot]
• Year: 2026
• Number of pages: XX, 61 str.
• PID: 20.500.12556/RUL-180943
• UDC: 621.791.725:669.245:691.714.018.8(043.2)
• COBISS.SI-ID: 272773123
• Publication date in RUL: 20.03.2026

Secondary language

• Language: English
• Title: Influence of joint edge geometry on hot cracking in laser welding of dissimilar materials

Abstract

The study addresses the issue of hot crack formation during laser welding of dissimilar materials, such as nickel alloy 2.4816 and stainless steel 1.4301. Under constant welding parameters, including pulse energy, focal distance, pulse shape, and feed rate, the influence of joint edge geometry and welding position on the occurrence of hot cracks in fillet welds is analyzed. In addition to the hot cracks examined by microscopy, an analysis of cross-sections is performed, on the basis of which the weld cross-sectional shape and weld dilution are determined, and their influence on crack formation is evaluated. Results show that a certain joint edge geometry results in fewer imperfections in the weld than the configuration without edge preparation; however, the configuration without edge preparation proved to be the most suitable in practice.

• Keywords: hot cracks, edge bevels, fillet welds, weld dilution, laser welding, austenitic microstructure