TY - JOUR A1 - Schmailzl, Anton A1 - Steger, Sebastian A1 - Hierl, Stefan T1 - Process monitoring at laser welding of Thermoplastics BT - 3D-scanner with integrated pyrometer enables online temperature monitoring at quasi-simultaneous laser transmission welding JF - Laser Technik Journal N2 - A pyrometer, integrated into a 3D‐scanner, offers the possibility to measure the weld seam temperature at quasi‐simultaneous laser transmission welding. Experimental studies have shown that gaps located in the joining zone can be identified by a temperature rise even at a high scanning velocity. This enables the implementation of algorithms for observation and control strategies. Y1 - 2015 U6 - https://doi.org/10.1002/latj.201500029 VL - 12 IS - 4 SP - 34 EP - 37 ER - TY - JOUR A1 - Dostalek, Michael A1 - Steger, Sebastian A1 - Schmailzl, Anton A1 - Hierl, Stefan T1 - Detecting Defects Reliably BT - Pyrometer-Based Temperature Measurement during Quasi-Simultaneous Laser Transmission Welding JF - Kunststoffe International N2 - The integration of a broadband pyrometer in a 3-D scanner enables a continuous and local temperature measurement during the quasi-simultaneous laser transmission welding process. Welding tests on polyethylene samples show that defects can be clearly identified based on the temperature signal, despite a high scanning velocity. Y1 - 2015 VL - 105 IS - 12 SP - 37 EP - 40 ER - TY - CHAP A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - CADFEM GmbH, ED - ANSYS Germany GmbH, T1 - Thermo-mechanische Struktursimulation mit ANSYS Workbench 14.0 am Beispiel des Laser-Durchstrahlschweißens T2 - ANSYS Conference & 31st CADFEM Users' Meeting - ACUM, June 19-21, Mannheim Y1 - 2013 N1 - DVD-ROM SP - 1 EP - 16 CY - Grafing bei München, Darmstadt ER - TY - RPRT A1 - Talbot, Sebastian A1 - Hierl, Stefan A1 - Schmailzl, Anton ED - Baier, Wolfgang T1 - Thermische FEM-Simulation des Laser-Durchstrahlschweißens T2 - Forschungsbericht 2013 Y1 - 2014 UR - https://doi.org/10.35096/othr/pub-799 SP - 45 EP - 46 CY - Kiel ER - TY - CHAP A1 - Preischl, Antonius A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - Ziemann, Olaf ED - Mottok, Jürgen ED - Pforr, Johannes T1 - Experimental study to evaluate the process window for laser transmission welding of plastics T2 - Applied Research Conference 2014 - ARC 2014, 5th July 2014, Ingolstadt Y1 - 2014 SP - 517 EP - 522 PB - Shaker CY - Aachen ER - TY - CHAP A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - GSI Niederlassung SLV München, T1 - Online-Prozessüberwachung beim Quasi-Simultanen Laser-Durchstrahlschweißen von Kunststoffen T2 - Young Professionals - Jugend forscht und schweisst Y1 - 2013 SP - 1 EP - 7 ER - TY - JOUR A1 - Steger, Sebastian A1 - Dostalek, Michael A1 - Schmailzl, Anton A1 - Hierl, Stefan T1 - Fehlstellen sicher erkennen BT - Pyrometerbasierte Temperaturmessung beim quasi-simultanen Laser-Durchstrahlschweißen JF - Kunststoffe Y1 - 2015 VL - 105 IS - 12 SP - 55 EP - 58 ER - TY - CHAP A1 - Schmailzl, Anton A1 - Hüntelmann, Sven A1 - Loose, Tobias A1 - Käsbauer, Johannes A1 - Maiwald, Frederik A1 - Hierl, Stefan ED - Sommitsch, Christof ED - Enzinger, Norbert ED - Mayr, Peter T1 - Potentials of the ALE-Method for Modeling Plastics Welding Processes, in Particular for the Quasi-Simultaneous Laser Transmission Welding T2 - Mathematical Modelling of Weld Phenomena 12 N2 - The Arbitrary-Lagrangian-Eulerian-Method (ALE-Method) offers the possibility to model the quasi-simultaneous laser transmission welding of plastics, in which a squeeze-flow of molten plastic occurs. It is of great interest to get a deeper understanding of the fluid-structure-interactions in the welding zone, since the occurring squeeze-flow transports heated material out of the joining zone, causinga temperature decrease inside.In addition, the numerical modelling offers the possibility to investigate the flow conditions in the joining zone. The aim of this article is to show the potentials of the ALE-Method to simulatethe quasi-simultaneous laser transmission welding with the commercially available software LS-DYNA. The central challenge is to realize a bi-directionalthermo-mechanically coupled simulation,which considers the comparatively high thermal expansion and calculates the interactions of solid and melted plastic correctly. Finally, the potentials of the ALE element formulations for the mathematical description of welding processesare shown, especially for those with a squeeze-flow. Y1 - 2018 U6 - https://doi.org/10.3217/978-3-85125-615-4-51 SP - 965 EP - 975 PB - Verlag der Technischen Universität Graz CY - Graz ER - TY - CHAP A1 - Schmailzl, Anton A1 - Hierl, Stefan A1 - Schmidt, Michael ED - Schmidt, Michael T1 - Gap-Bridging during Quasi-Simultaneous Laser Transmission Welding T2 - Physics Procedia N2 - Tightness is often the main requirement for quasi-simultaneous laser transmission welds. However, remaining gaps cannot be detected by the used set-path monitoring. By using a pyrometer in combination with a 3D-scanner, weld seam interruptions can be localized precisely while welding, due to temperature deviations along the weld contour. To analyze the temperature signal in correlation to the progress of gap-bridging, T-joint samples with predefined gaps are welded. The set-path is measured synchronously. Additionally, the temperature distribution and the influence of the thermal expansion of the polymers are studied by a thermo-mechanical FEM-process simulation. On top of that, the melt blow-out of the welded samples is analyzed using μCT-measurements. The experiments have shown that closing of a gap can be identified reliably by the temperature signal and that the squeezed melt flow into the gap and the thermal expansion in the gap zone accelerates gap-bridging. Furthermore the inserted heat can be adapted in the fault zone, in order to avoid thermal damage. Y1 - 2016 U6 - https://doi.org/10.1016/j.phpro.2016.08.113 SN - 1875-3892 SN - 1875-3884 VL - 83 SP - 1073 EP - 1082 PB - Elsevier CY - Amsterdam [u.a.] ER - TY - CHAP A1 - Schmailzl, Anton A1 - Amann, Thomas A1 - Glockner, Markus A1 - Fandanelli, Martin A1 - Wagner, Marcus A1 - Hierl, Stefan ED - CADFEM GmbH, ED - ANSYS Germany GmbH, T1 - Finite element analysis of thermoplastic probes under tensile load using ls-dyna compared to ansys workbench 14 in correlation to experimental investigations T2 - ANSYS Conference & 30th CADFEM Users' Meeting - ACUM, 24.-26- Oktober 2012, Kassel N2 - Joining thermoplastic requisitions is a popular technique to build sophisticated plastic applications. Therefore the laser-transmission welding process is used to join thermoplastic polymers in visible regions. The clamping force in this case plays a decisive role when it comes to the weld quality. Simulating the clamping pressure with finite element techniques is therefore highly attractive to understand the principal of the process. Thermoplastic polymers under tensile load often show a brittle behavior coupled with softening. Simulating such materials is quite difficult for FEM programs. In this case a finite element study of the tensile test in LS-DYNA and ANSYS Wb 14 with respect to the material models was analysed. The experimental data get validated in comparison with the FEM solution for a tensile test. The material models and the problems in simulating softening behavior for thermoplastic polymers were discussed Y1 - 2012 UR - https://www.oth-regensburg.de/fileadmin/media/fakultaeten/m/labore/FEM/pdf/fb-2012_paper_acum.pdf N1 - DVD-ROM SP - 1 EP - 10 CY - Grafing bei München ER -