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Sunny start to the new semester (April 2023). Show image information

Sunny start to the new semester (April 2023).

Photo: Paderborn University, Besim Mazhiqi

Dr.-Ing. Eugen Wiens

Dr.-Ing. Eugen Wiens

Umformende und Spanende Fertigungstechnik

Chief Engineer - Academic Councillor for a Limited Period

Transregional Collaborative Research Centre 285

Member - Academic Councillor for a Limited Period - Teilprojekt C03

+49 5251 60 3150
+49 5251 60-5342

Open list in Research Information System


Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy

T. Borgert, M. Neuser, E. Wiens, O. Grydin, W. Homberg, M. Schaper, in: Materials Research Proceedings, Materials Research Forum LLC, 2023, pp. 187-194

<jats:p>Abstract. Requirements of multi-material construction involve adjustments to standard joining techniques. Especially the growing importance of integral cast components poses additional engineering challenges for the industry. One approach to achieve these goals are adaptable joining elements formed by friction spinning. This approach uses friction-induced heat to form customisable joining elements to join sheets for different boundary conditions, even for brittle cast materials. It is possible to react immediately to adapt to the joining process inline and reduce the amount of different joining elements. As the joining partner serve casting plates of the aluminium casting alloy EN AC–AlSi9, which is processed in the sand casting. Joining hypoeutectic AlSi alloys constitutes a challenge because the brittle character of these cause cracks in the joint during conventional mechanical joining. Furthermore, the friction-induced heat of the novel joining process causes a finer microstructure in the hypoeutectic AlSi9 casting alloy. In particular, the eutectic Si is more fine-grained, resulting in higher joint ductility. This study indicates the joining suitability of a hypoeutectic aluminium casting alloy in combination with adaptive manufactured additional joining elements. Here, various mechanical and microstructural investigations validate the influence of the thermomechanical joining technique. In conclusion, the potential of this joining process is presented regarding the joinability of cast aluminium components. </jats:p>



Forming of Parts with Locally Defined Mechanical and Ferromagnetic Properties by Flow-Forming

E. Wiens, W. Homberg, B. Arian, K. Möhring, F. Walther, in: Forming the Future, Springer International Publishing, 2021


Joining with versatile joining elements formed by friction spinning

C. Wischer, E. Wiens, W. Homberg, Journal of Advanced Joining Processes (2021), 3, 100060



Joining with Versatile Friction-Spun Joint Connectors

T. Rostek, E. Wiens, W. Homberg, Procedia Manufacturing (2020), 47, pp. 395-399


Some ideas for the further development of hydroforming process chains

E. Wiens, E. Djakow, W. Homberg, in: Nebu/Nehy 2020, 2020

Even though the spectrum of parts is expected to shift over the long term as a result of increasing e-mobility, there is still an extremely high demand for complex components made of high-strength materials which can only be produced by hydroforming technologies. The innovative combination of hydroforming processes with other forming processes, as well as the improvement of the processes themselves, offers considerable potential for improvement. A number of promising ways of improving the hydroforming process chain are therefore the subject of this contribution. The focus of the article is on possible approaches for combining (incremental) pre- and post-forming operations, which can permit considerable improvements in both quality and features at a reduced cost. Furthermore, a novel combination of quasi-static and high-speed forming processes is presented, leading to an improved overall forming process (with a high application potential) for the production of complex parts.


Forming analysis of tailored tubes with an internal contoured wall thickness and external axial ribs manufactured by internal flow-turning




Internal Flow-Turning – extended manufacturing possibilities in tailored tube production

E. Wiens, W. Homberg, MATEC Web of Conferences (2018), 11002



Internal Flow-Turning – a new approach for the manufacture of tailored tubes with a constant external diameter

E. Wiens, W. Homberg, Procedia Engineering (2017), 207, pp. 1755-1760


Internal flow-turning – efficient manufacture of load-adapted tubes with a constant external diameter

E. Wiens, W. Homberg, in: Proceedings of the International Conference on Steels in Cars and Trucks SCT 2017, 2017

Walzen statt drehen

E. Wiens, Bänder Bleche Rohre (2017), bbr 2, pp. 59


Internal Flow-Turning - An Innovative Technology for the Manufacture of Tailored Tubes

W. Homberg, T. Rostek, E. Wiens, in: Key Engineering Materials, Trans Tech Publications Ltd, 2015, pp. 65-70

<jats:p>In order to optimise the material utilisation and improve the lightweight design of automotive parts tailored hollow profiles are needed, especially as semi-finished parts for hydroforming. Internal Flow-Turning is an innovative incremental forming technology which enables the manufacture of tubes featuring a varying wall thickness and a constant outer diameter. These characteristics facilitate the material feed at hydroforming processes significantly. In addition, the spinning-related forming technology improves the mechanical material properties, shape and dimensional accuracy, and the surface quality of parts produced.</jats:p>

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