Thesis supervisor: Valéria Mertinger
co-supervisor: Yoni Adonyi
Location of studies (in Hungarian): Miskolci Egyetem,FKNI Abbreviation of location of studies: AVK
Description of the research topic:
The widely used Friction Stir Welding (FSW) process has been plagued from Day One by the presence of the exit hole at the end of the weld, but many innovative solutions have been found to eliminate it. For example, the retractable pin- and run-off tooling solutions have been the most successful and widely applied, but TIG welding was often used to fill the hole. Being one of the newest modifications of the FSW process, not much is known about the Refill Friction Stir Spot Welding (RFSSW) weld performance when compared to Resistance Spot Welding and riveting, two of the current most common processes used for sheet metal joining by the automotive and aerospace industries. While static (shear loading) performance has been used for comparison between the three processes mentioned above (RFSSW, RSW and riveting), fatigue, corrosion and crash worthiness data is not available in the open literature. The effect of process parameters such as plunge depth, rotational speed of the tools, delay time between axial displacement of each part, etc. on the RFSSW performance is also not clear.
Finally, advanced characterization of the RFSSW is lacking, related to destructive test failure modes, root cause analysis, residual stresses, grain orientation, etc., especially related to an apparent lack of symmetry in properties around the circumference in the weld nugget.
At the end of the study, the expected performance of RFSSW joints relative to the state-of-the-art processes will be better known. A fundamental explanation of the RFSSW failure mode will be completed and the effects of process parameters on optimizing RFSSW will be available by the end of the work.
The results will benefit industries thinking of adopting the RFSSW process in their plants and will aid RFSSW equipment manufacturers to improve their product.
Number of students who can be accepted: 1
Deadline for application: 2023-01-15
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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