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Vibration Welding of Radiation Cross Linked Polyamide 66

One potential possibility of extending the range of properties of engineering thermoplastics is provided by radiation cross linking. This allows to influence the thermal properties as well as he mechanical and chemical properties. If plastic components cannot be manufactured in a single fabrication step it becomes necessary to utilize joining technologies. Welding yields the advantages of a material-locking and media-tight joint which permits a high load transmission without using any welding filler materials. The vibration welding of thermoplastics after radiation cross linking is not carried out on the current state of the art in industrial applications. The reason for this is the lack of a comprehensive understanding of the process of vibration welding of radiation cross linked thermoplastics. In the work, this understanding of the process was systematically worked out.

Radiation cross linked thermoplastics are not able to flow above the crystallite melting temperature. This eliminates the usual melt flow during welding, resulting in a fundamentally different process curse and a different internal structural configuration of the weld. In the studies it could be shown that especially the conformation of the molecular chains in the weld has a decisive influence on the weld strength. The more molecules in the weld have crystallized in trans-conformation, the higher the weld strength. With a suitable choice of process parameters weld strengths within the area of the base material strength could be achieved.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Markus Menacher

Markus Menacher
Lehrstuhl für Kunststofftechnik (LKT)
Universität Erlangen-Nürnberg

Information

Free keywords: welding, vibration welding, plastics, polyamide 66, radiation cross linking, weld temperature, weld strength, crystallisation, conformation FTIT-spectroscopy, simulation
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dietmar Drummer (Betreuer), Prof. Dr.-Ing. Michael Gehde, Prof. em. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein
Publication year: 2015
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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