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Manufacturing and material-science considerations for vibration welding of polymeric materials

In vibration welding experiments, the weld strength can be described as a function of the parameters. Using the same welding parameters the variation of the thickness of the weld seam shows no dependency of the structural build-up of the weld area and the mechanical characteristics. The structural build-up and the weld strength only is influenced by the pressure used in the experiments. The time necessary for reaching the steady state phase in Vibration welding process increases with increasing thickness.

ln the vibration welding of closed seams the angle between the vibratory motion and the weld seam varies between 0 and 90 degrees. Experiments using low welding pressure show, that with increasing angle the time to reach the steady state phase decreases. The weld strengths show a constant Ievel. Using high pressure the weld strength increases with increasing angle between vibratory motion and the weld seam.

The most important facts affecting high weld strengths are the material based welding pres-sure and the penetration, which must exceed a critical threshold, corresponding to the beginning of the steady state phase. For recognizing the steady state phase in welding process a mathematical method, based on neural network techniques could be used. The results show that the new method for identifying phase 3 in vibration welding improves the controlability of the process using characteristical process datas.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Michael Giese

Michael Giese
Lehrstuhl für Kunststofftechnik (LKT)
Universität Erlangen-Nürnberg

Information

Free keywords: vibration welding, welding parameter, structural build-up, mechanical characteristics, on-line process assessment, neuronal network, characteristic process data, statistic process control
Institute / chair: Technischen Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein (Betreuer), Prof. Dr.-Ing. Dr.-Ing. E.h. Walter Michaeli
Publication year: 1995
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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