TY - GEN A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - CADFEM GmbH, ED - ANSYS Germany GmbH, T1 - FE-Modellbildung der Strahl-Stoff-Wechselwirkung beim Laser-Durchstrahlschweißen in ANSYS 14.0 T2 - ANSYS Conference & 32th CADFEM Users' Meeting 2014, 04.-06. Juni, Nürnberg Y1 - 2014 N1 - DVD-ROM SP - 1 EP - 15 CY - Grafing bei München ER - TY - GEN A1 - Maiwald, Frederik A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - Klippel, Clemens ED - Mottok, Jürgen ED - Reichenberger, Marcus T1 - Thermo-mechanical computation of weld seam geometry in laser transmission welding BT - Poster Session T2 - Applied Research Conference - ARC 2017, 7 July 2017, München Y1 - 2017 PB - pro Business GmbH CY - Berlin ER - TY - CHAP A1 - Schmailzl, Anton A1 - Steger, Sebastian A1 - Dostalek, Michael A1 - Hierl, Stefan ED - Klotzbach, U. ED - Washio, K. ED - Arnold, C. B. T1 - Online process monitoring at quasi-simultaneous laser transmission welding using a 3D-scanner with integrated pyrometer T2 - Proc. SPIE, Laser-based Micro- and Nanoprocessing X, SPIE LASE 2016, San Francisco, California, United States N2 - Quasi-simultaneous laser transmission welding is a well-known joining technique for thermoplastics and mainly used in the automotive as well as in the medical industry. For process control usually the so called set-path monitoring is used, where the weld is specified as "good" if the irradiation time is inside a defined confidence interval. However, the detection of small-sized gaps or thermal damaged zones is not possible with this technique. The analyzation of the weld seam temperature during welding offers the possibility to overcome this problem. In this approach a 3D-scanner is used instead of a scanner with flat-field optic. By using a pyrometer in combination with a 3D-scanner no color-corrected optic is needed in order to provide that laser- and detection-spot are concentric. Experimental studies on polyethylene T-joints have shown that the quality of the signal is adequate, despite the use of an optical setup with a long working distance and a small optical aperture. The effects on temperature are studied for defects like a gap in the joining zone. Therefore a notch was milled into the absorbent polymer. In case of producing housings for electronic parts the effect of an electrical wire between the joining partners is also investigated. Both defects can be identified by a local temperature deviation even at a feed rate of four meters per second. Furthermore a strategy for signal-processing is demonstrated. By this, remaining defects can be identified. Consequently an online detection of local defects is possible, which makes a dynamic process control feasible. KW - Defect detection KW - Fiber lasers KW - Laser ablation KW - Laser processing KW - Laser welding KW - Mirrors KW - Process control KW - Pyrometry KW - Scanners KW - Signal processing KW - Temperature metrology KW - Polymers Y1 - 2016 U6 - https://doi.org/10.1117/12.2211705 IS - 97361J SP - 1 EP - 7 ER - TY - CHAP A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - CADFEM GmbH, ED - ANSYS Germany GmbH, T1 - Rechenzeitoptimierte Temperaturfeldberechnung beim quasisimultanen Laser-Durchstrahlschweißen T2 - ANSYS Conference & 33. CADFEM Users' Meeting 2015, 24.-26. Juni 2015, Bremen, Germany N2 - Beim quasisimultanen Laser-Durchstrahlschweißen von Kunststoffen wird bisher die FEM-Simulation wegen der Vielzahl von Umläufen des Laserstrahls und der damit verbundenen hohen Rechenzeit kaum eingesetzt. Um die Temperaturfeldberechnung zur Prozessauslegung und -optimierung praktikabel nutzen zu können, ist eine Reduktion der Rechenzeit zwingend erforderlich. Zur Simulation von Schweißvorgängen in ANSYS-CLASSIC werden die thermischen Lasten mithilfe von Ersatzwärmequellen auf Basis von APDL-Routinen berechnet. Im Gegensatz dazu wird in dieser Arbeit eine analytische Lastfunktion zur Berechnung der thermischen Last für das quasismultane Laser-Durchstrahlschweißen vorgestellt. Im Vergleich zur Temperaturfeldberechnung mit Ersatzwärmequelle kann bei der Berechnung eines dreidimensionalen Modells die Rechenzeit von mehreren Wochen auf wenige Stunden und für ein zweidimensionales auf nur wenige Minuten reduziert werden. Y1 - 2015 UR - http://www.cae-wiki.info/wikiplus/images/6/6a/UM2015-2.04.03.pdf N1 - DVD-ROM SP - 1 EP - 15 CY - Grafing bei München ER - TY - RPRT A1 - Steger, Sebastian A1 - Schmailzl, Anton A1 - Dostalek, Michael A1 - Armbruster, Dominik A1 - Hierl, Stefan ED - Baier, Wolfgang T1 - Entwicklung einer Systemtechnik für das quasisimultane Laser-Durchstrahlschweißen von 3D-Kunststoffbauteilen mit Temperaturmessung und Spanndruckregelung T2 - OTH Forschungsbericht 2016 Y1 - 2016 UR - https://doi.org/10.35096/othr/pub-1384 SP - 37 EP - 38 PB - Inixmedia GmbH CY - Kiel ER - TY - CHAP A1 - Schmailzl, Anton A1 - Armbruster, Dominik A1 - Dostalek, Michael A1 - Steger, Sebastian A1 - Hierl, Stefan ED - Falter, Thomas T1 - Strahlführungs- und -formungskonzept zur koaxialen Temperaturmessung beim scanner-basierten Laser-Durchstrahlschweißen T2 - 2. OTH-Clusterkonferenz, 18. Januar 2017, Techbase, Regensburg, Tagungsband Y1 - 2016 SP - 201 EP - 204 PB - Weber Druck CY - Regensburg ER - TY - CHAP A1 - Schmailzl, Anton A1 - Geißler, Bastian A1 - Maiwald, Frederik A1 - Laumer, Tobias A1 - Schmidt, Michael A1 - Hierl, Stefan ED - Esen, Cermal T1 - Transformation of Weld Seam Geometry in Laser Transmission Welding by Using an Additional Integrated Thulium Fiber Laser T2 - Lasers in Manufacturing - LIM 2017, Conference Proceedings Y1 - 2017 N1 - CD-ROM SP - 1 EP - 10 CY - München ER - TY - RPRT A1 - Schmailzl, Anton A1 - Hierl, Stefan ED - Baier, Wolfgang T1 - Rechenzeitoptimierte Temperaturfeldberechnung zur virtuellen Prozessauslegung des quasisimultanen Laser-Durchstrahlschweißens T2 - Forschungsbericht 2014 / Ostbayerische Technische Hochschule Regensburg Y1 - 2015 SP - 75 EP - 77 PB - Inixmedia GmbH CY - Kiel ER - 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 -