Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Investigation of the process decisive beam / matter interaction for laser transmission welding of plastics



Datum: 14.11.2007


Author


Reporter

  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr. h.c. mult. M. Geiger
  • Prof. Dr.-Ing. E. Schmachtenberg

The purposes of this thesis is an optimization of the laser transmission welding process in terms of improved gap bridging capability and higher weld seam strengths. A necessary precondition for process optimization is a profound process knowledge. Therefore, the laser beam / matter interaction is investigated in dependence of polymer structure and material temperature and modeled in a FE-based process simulation. In order to optimize the welding process an elongation of the melt pool is carried out by means of alternative beam shaping strategies. Experimental test series prove that due to an elongated melt pool and a modified temperature field higher weld seam strengths and improved gap bridging capabilities are possible.