Residual stresses and crack formation in laser welding of amorphous polymers

  • Residual stresses in welded parts can limit the mechanical performance and reliability of the components. In polymers, especially in amorphous thermoplastics, tensile residual stresses in the presence of certain media can lead to environmental stress cracking, which can result in catastrophic failure of the connection. In this work the mechanisms of stress generation in welding of plastics is compared to metallic materials and methods for evaluating residual stresses are discussed in terms of suitability to polymer materials. The application of solvents in liquid and vapor phase is shown to be a useful tool for intentionally inducing stress cracking in laser-welded parts to evaluate and compare residual stress levels and orientations in the weld zones. Appropriate process parameters are examined for reducing welding stresses.

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Author:Andreas Schkutow, Thomas Frick, Samir Lamrini, Karsten Scholle, Peter Fuhrberg
URL / DOI:https://wlt.de/lim/Proceedings2019/data/PDF/Contribution_232_final.pdf
Parent Title (English):Lasers in Manufacturing Conference 2019
Document Type:conference proceeding (article)
Language:English
Date of first Publication:2019/06/24
Contributing Corporation:Wissenschaftliche Lasertechnik Gesellschaft e.V.
Release Date:2025/02/26
Tag:laser transmission welding; polymers; residual stresses; environmental stress cracking
Pagenumber:9
Konferenzangabe:WLT LiM - Lasers in Manufacturing Conference, 2019, Munich
institutes:Fakultät Maschinenbau und Versorgungstechnik
Institut für Chemie, Material- und Produktentwicklung
Research Themes:Materialien & Produktionstechnik
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