Thesis supervisor: Ákos Meilinger
Location of studies (in Hungarian): Institute of Materials Sciences and Technology Abbreviation of location of studies: ATI
Description of the research topic:
The base materials used in the automotive industry have started to develop seriously, both steel and aluminium. Nowadays, different high-strength steels can be said to be average in a car body, and high-strength heat treated / formed aluminium alloys are also constantly spreading. As a result of this development, it is increasingly possible to encounter special material pairings, the joining technology of which is not yet fully developed. One of the most serious of these challenges is the hybrid joining of aluminium and steel. Using conventional fusion welding processes, the production of this type of joints is not solved, but serious results can be expected in case of pressure welding processes, so it is justified to investigate the applicability of resistance spot welding.
The properties of aluminium and steel are significantly different, whether we are talking about physical or mechanical properties. As a result, there is also a significant difference in weldability, so they require basically different welding technology. This fact makes it significantly more difficult to make joint joints between steel and aluminium. In addition, recent researches have clearly highlighted the possibility of making good quality joints by resistance spot welding. Beside the welding parameters, the design of welding electrodes has serious effect to the joints, so this field contains many research opportunities.
During resistance spot welding, complex processes take place, because beside the resistance heat, we also use welding force to create the joints. This leads different microstructure as in case of fusion welding processes, so a different approach is needed to determine weldability issues, especially for the joining of aluminium and steel.
The use of physical simulation is also possible in the research. In this way, we can significantly help to develop the research topic and gain a deeper understanding of the processes that take place during welding. The changes in the heat affected zones can be accurately investigated, and a lot of information can be gained about the weldability.
Research conditions: the required welding equipment and testing equipments (Gleeble 3500 physical simulator, material testing equipment) are available at the Institute of Materials Science and Technology, as well as at the cooperating institutes.
Industrial background: The Institute of Materials Science and Technology provide a wide cooperation network in the industrial area.
Part-time education abroad: the actuality and importance of the research work offer the possibility of part time research abroad.
Further requirements:
• Language: good English for literature overview
• Preliminary studies:
- mechanical engineer MSc diploma with good or excellent grade;
- basic knowledge about material technologies and welding.
Recommended literature:
• Gullino, A; Matteis, P; D’Aiuto, F.: Review of aluminium-to-steel welding technologies for car-body applications, Metals, 2019
• Resistance Welder Manufacturals’ Association: Resistance welding manual, Philadelphia, 2003
• Meilinger. A; Török, I; Balogh, A; Juhász, K.: Main characteristics of fusion and pressure welding of aluminium alloys, Production Processes and Systems, Vol. 5, 2012
• Chen, N; Wang, M; Wang, H; Wan, Z; Carlson, B. E.: Microstructural and mechanical evolution of Al/steel interface with Fe2Al5 growth in resistance spot welding of aluminum to steel, Journal of Manufacturing Processes, Vol. 34, 2018
• Tanmoy, D; Jinu, P.: Interlayers in Resistance Spot‑Welded Lap Joints: A Critical Review, Metallography Microstructure and Analysis, 2021
Number of students who can be accepted: 1
Deadline for application: 2022-05-31
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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