Analiza FSW spoja iz raznorodnih aluminujevih zlitin v vzdolžni smeri varjenja

Avbelj, Nejc (author), Trdan, Uroš (mentor), Klobčar, Damjan (comentor)

Poleg stalne zahteve zmanjšanja emisij ter prevoznih stroškov na račun teže tovora, so lahki materiali z dobrimi mehanskimi lastnostmi vedno bolj uporabljeni v industriji. Visoko-trdnostne aluminijeve zlitine so ene izmed njih, vendar pa jih je s konvencionalnimi talilnimi postopki varjenja nemogoče uspešno spajati, še posebno v primeru spajanja raznorodnih zlitin. Iz tega vidika je postopek varjenja s trenjem in gnetenjem (FSW) izredno perspektiven saj omogoča kakovosten zvarni spoj brez napak tudi v primeru spajanja teh materialov. V zaključnem delu smo iz FSW spoja izdelanega iz raznorodnih aluminijevih zlitin serij 2017A-T451 in 7075-T651 izrezali vzorce ter jih ustrezno pripravili za nadaljnje meritve in analize. Nato smo izvedli podrobne meritve mikrotrdote v vzdolžni smeri zvara v več linijah. Hkrati smo iz vidika preučitve vpliva orodja ter vnosa toplote opravili meritve na različnih globinah pod površjem temena zvarnega spoja. Nato smo vzorce makroskopsko pregledali ter izvedli mikroskopske meritve prehodnih območij zvarnega spoja ter mesta kjer so bili izmerjeni ekstremi mikrotrdot. Profile mikrotrdot smo nato poskušali ustrezno povezati z mikrostrukturnimi značilnostmi FSW spoja.

• Language: Slovenian
• Keywords: raznorodne visoko-trdnostne aluminijeve zlitine, varjenje z gnetenjem-FSW (angl. Friction Stir Welding), mikrotrdota, makrostruktura, mikrostruktura
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [N. Avbelj]
• Year: 2021
• Number of pages: XV, 37 str.
• PID: 20.500.12556/RUL-130452
• UDC: 669.715:621.791:620.17(043.2)
• COBISS.SI-ID: 76954371
• Publication date in RUL: 15.09.2021

AVBELJ, Nejc, 2021, Analiza FSW spoja iz raznorodnih aluminujevih zlitin v vzdolžni smeri varjenja [online]. Bachelor’s thesis. Ljubljana : N. Avbelj. [Accessed 25 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=130452

Secondary language

• Language: English
• Title: Analisys of dissimilar aluminium alloy FSW in longitudinal direction

Abstract

In addition to the constant demand to reduce emissions and transport costs at the expense of cargo weight, lightweight materials with good mechanical properties are increasingly used in industry. High-strength aluminium alloys are one of them, but it is impossible to successfully join them with conventional fusion welding processes, especially in the case of joining dissimilar alloys. From this point of view, the process of friction stir welding (FSW) is extremely promising as it enables a quality welded joint without defects even in the case of joining these materials. In the final part, we cut samples from FSW joint made of dissimilar aluminum alloys of the 2017A-T451 and 7075-T651 series and prepared them accordingly for further measurements and analyzes. We then performed detailed microhardness measurements in the longitudinal direction of the weld in several lines. At the same time, from the point of view of studying the influence of the tool and heat input, we performed measurements at different depths below the top surface of the welded joint. Then we macroscopically examined the samples and made microscopic measurements of the transition areas of the welded joint and places where the microhardness extremes were measured. Then we attempted to appropriately relate the microhardness profiles to the microstructural characteristics of the FSW joint.

• Keywords: dissimilar high-strength aluminium alloys, friction stir welding - FSW, microhardness, macrostructure, microstructure