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• W2772818850 abstract "The laser transmission welding is one possibility to join parts, which have been produced in the special injection moulding process structural foam-moulding. Besides reduced weight such parts with reduced density show a reduced cycle time as well as improved size accuracy. Up to now there are no empirical values regarding the laser transmission welding of foamed injection moulded parts. For the use of the laser transmission welding process in a larger scale it is important to acquire knowledge in how far the structure of the foam influences the welding process, the bond strength and the structure of the joint. These knowledges allow an application-specific adjustment of the injection moulding process and the joining process. As part of a current research project the dependence of the foam structure to the injection moulding parameters have been determined using a breathing cavity. That way it is possible to produce parts, which have a defined thickness of the surface layer as well as specified average cell size. Therefore the integral foam parts are analysed via light microscopy. It is shown that the mass flow rate (MFR) has a major influence to the cell structure and the injection time has a significant influence on the thickness of the surface layer. Furthermore the opening speed while mould breathing has an influence on the cell size as well. In addition to these researches the transparent parts have been investigated regarding its transmission properties to show, that the cell structure influences the optical path of the laser beam and therefore the intensity distribution. In further researches the welding suitability of foamed parts is investigated. Therefore the energy input into the material is varied to create process windows and to determine suitable process parameters for the welding process. In addition it is necessary to research the welding pressure, because a high pressure can expel the melt from the joining area and destroy the cell structure." @default.
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• W2772818850 date "2017-01-01" @default.
• W2772818850 modified "2023-09-23" @default.
• W2772818850 title "Laser transmission welding of foamed thermoplastic injection moulded parts" @default.
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• W2772818850 doi "https://doi.org/10.1063/1.5016724" @default.
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