Utjecaj parametara laserskog zavarivanja na mehanička svojstva i mikrostrukturu spoja Hilumin / aluminij serije 1050

master's thesis

• Title (english): Influence of laser welding parameters on mechanical properties and microstructure in Hilumin / aluminium series 1050 joint
• Author: Patrik Klasić
• Mentor: Ivica Garašić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U ovom radu analizirana je problematika zavarivanja raznorodnih materijala s obzirom na fizikalna svojstva i metaluršku kompatibilnost koja za aluminij i čelik rezultira krhkim i tvrdim intermetalnim spojevima. Karakterizirali su se režimi i načini rada laserskog zavarivanja, fizikalni fenomeni kolapsa i stvaranja ključanice te utjecaj parametara na svojstva zavara. Sagledavanjem lasera kao tehnologije spajanja, približena su osnovna svojstva laserske zrake, vrste lasera i fizikalna interakcija zrake s različitim materijalima. Završno, prikazan je način vođenja svjetla u optičkom kablu, način rada i osnovni dijelovi fiber lasera.
U eksperimentalnom dijelu primijenjene su različite kombinacije parametara fiber lasera za zavarivanje aluminija 1050 na Hilumin. Osiguranjem prikladne konfiguracije oblika spoja, provedeno je ispitivanje smične sile, penetracije zavara i mikrotvrdoće. Zaključilo se je da je snaga lasera najutjecajniji parametar za povećanje penetracije. Najveći iznos smične sile dobiven je prilikom najveće penetracije, no također i najveći iznos poroznosti. Mjerenjem mikrotvrdoće identificirali su se svi najčešći intermetalni spojevi.

Abstract (english)

In this study, the issues related to welding dissimilar materials were analysed concerning their physical properties and metallurgical compatibility, resulting in brittle and hard intermetallic compounds between aluminium and steel. The modes and types of laser welding were characterized, including the physical phenomena of collapse and keyhole formation, along with the influence of parameters on weld properties. By considering the laser as a joining technology, the fundamental properties of the laser beam, types of lasers, and the physical interaction of the beam with different materials were outlined. Finally, the mechanism of light guidance in an optical cable, its operation, and the basic components of fiber lasers were presented.
In the experimental section, various combinations of fiber laser parameters were applied for welding aluminium 1050 to Hilumin. By ensuring an appropriate joint configuration, examinations were conducted on shear force, weld penetration, and microhardness. It was concluded that laser power is the most influential parameter for increasing penetration. The highest shear force was obtained with the maximum penetration, yet it also resulted in the highest level of porosity. Microhardness measurements identified all common intermetallic compounds.

• Keywords: raznorodni materijali; intermetalni spojevi; fiber laser; aluminij; Hilumin; smična sila; penetracija zavara; mikrotvrdoća
• Keywords (english): dissimilar materials; intermetallic compound; fiber laser; aluminium; Hilumin; shear force; weld penetration; microhardness
• Language: croatian
• URN:NBN: urn:nbn:hr:235:685044
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2028-12-07
• Created on: 2023-12-06 07:37:33