This article has been compiled on the basis of the many years' experience that has been acquired in the field of plastics welding by the Institute of Plastics Engineering (KTP) at the University of Paderborn. A brief report is given on the state of the art in laser and microwave welding technology. An overview is also included on the potential and limits of the use of laser and microwave welding in plastics processing. In the case of laser welding, a number of results achieved in welding of molded parts are presented that have been obtained in the course of extensive investigations. For microwave welding, a report is included on investigations that are currently running at the KTP. In addition to this, details are given on the basic suitability of laser and microwave welding for joining films and sheetings. Configuration for the indirect microwave welding of panels, left: side view, right: cross‐section.magnified imageConfiguration for the indirect microwave welding of panels, left: side view, right: cross‐section.

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