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Suche nach „[Extern]“ hat 60 Publikationen gefunden
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    Zeitschriftenartikel

    Anton Schmailzl, Johannes Käsbauer, J. Martan, P. Honnerová, F. Schäfer, M. Fichtl, T. Lehrer, L. Prušáková, J. Tesař, J. Skála, M. Honner

    Measurement of core temperature through semi-transparent polyamide 6 using scanner-integrated pyrometer in laser welding

    International Journal of Heat and Mass Transfer, vol. 146, no. January

    2020

    DOI: 10.1016/j.ijheatmasstransfer.2019.118814

    Abstract anzeigen

    Predicting the core temperature during welding is an ambitious aim in many research works. In this work, a 3D-scanner with integrated pyrometer is characterized and used to measure the temperature during quasi-simultaneous laser transmission welding of polyamide 6. However, due to welding in an overlap configuration, the heat radiation emitted from the joining zone of a laser transmission weld has to pass through the upper polymer, which is itself a semi-transparent emitter. Therefore, the spectral filtering of the heat radiation in the upper polymer is taken into account by calibrating the pyrometer for the measurement task. Thermal process simulations are performed to compare the temperature field with the measured temperature signal. The absorption coefficients of the polymers are measured, in order to get precise results from the computation. The temperature signals during welding are in good agreement with the computed mean temperature inside the detection spot, located in the joining area. This is also true for varying laser power, laser beam diameter and the carbon black content in the lower polymer. Both, the computed mean temperature and the temperature signal are representing the core temperature. In order to evaluate the spatial sensitivity of the measurement system, the emitted heat radiation from both polymers is calculated on basis of the computed temperature field. Hereby it is found, that more than 90 percent of the detected heat radiation comes from the joining area, which is a crucial information for contact-free temperature measurement tasks on semi-transparent polymers.

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    Zeitschriftenartikel

    Johannes Käsbauer, Anton Schmailzl, J. Prehm, T. Loose, S. Hierl

    Simulation of Quasi-Simultaneous Laser Transmission Welding of Plastics: Optimization of Material Parameters in Broad Temperature Range

    [Accepted for publication]

    Procedia CIRP

    2020

    Extern

    Ralf Alefs

    Praktiker-Kommentar Umsatzsteuer

    2019

    ISBN: 978-3-95554-426-3

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, S. Hüntelmann, T. Loose, Johannes Käsbauer, F. Maiwald, S. Hierl

    Potentials of the ALE-Method for Modeling Plastics Welding Processes, in Particular for the Quasi-Simultaneous Laser Transmission Welding

    Mathematical Modelling of Weld Phenomena 12, Graz, Österreich, vol. 12

    2019

    ISBN: 978-3-85125-615-4

    DOI: 10.3217/978-3-85125-615-4-51

    Abstract anzeigen

    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, causing a 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 simulate the quasi-simultaneous laser transmission welding with the commercially available software LS-DYNA. The central challenge is to realize a bi-directional thermo-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 processes are shown, especially for those with a squeeze-flow.

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    Beitrag (Sammelband oder Tagungsband)

    T. Heberholz, Anton Prihodovsky, M. Nowottnick

    Influence of a New Abnormal (CuNi)6Sn5 / (NiCu)3Sn4 Layer Growth at Temperatures Above 175°C in Tin Silver Based Lead-Free Solder Joints

    Proceedings of the SMTA International Conference 2019 (22-26 September 2019; Rosemont, IL, USA)

    2019

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    Beitrag (Sammelband oder Tagungsband)

    B. Quandt, Korbinian Schröcker, S. Hierl

    Prozessüberwachung beim quasi-simultanen Laser-Durchstrahlschweißen glasfaserverstärkter Thermoplaste

    9. Landshuter Leichtbau-Colloquium (2019), Landshut, vol. 9

    2019

    ISBN: 978-3-9818439-2-7

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, B. Quandt, S. Hierl, M. Schmidt

    Correlation between Joint Strength and Process Temperature in Quasi-Simultaneous Laser Transmission Welding of Polyamide 6

    Proceedings of LiM2019 - Lasers in Manufacturing (23 June 2019, Munich)

    2019

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    Zeitschriftenartikel

    Johannes Käsbauer, Anton Schmailzl, U. Weber, S. Hierl, T. Jaus, M. Schwalme

    Simulationsgestütze Evaluierung von Strahloszillationsmustern beim quasi-simultanen Laser-Durchstrahlschweißen.

    Joining Plastics - Fügen von Kunststoffen, no. 2, pp. 102-109

    2019

    Extern

    Wolfgang Aschauer, Heike Bähre, Carmen Chasovschi, Axel Dreyer, Bernd Eisenstein, Jochen Eisentraut, Ulrike Fergen, Jon Hanf, Tim Harms, Stefanie Haselwanter, Christian Hausy, Thomas Herdin, Felix Herle, Marcus Herntrei, Kerstin Heuwinkel, Eric Horster, Andreas Kagermeier, Edgar Kreilkamp, Ina Zur Oven-Krockhaus, Markus Pillmayer, Julian Reif, Jens Rüdiger, Manuel Sand

    Tourismus und Gesellschaft. Kontakte - Konflikte - Konzepte

    22. Jahrestagung der Deutschen Gesellschaft für Tourismuswissenschaft (08.11. bis 10.11.2018, Fachhochschule Westküste, Heide)

    Schriften zu Tourismus und Freizeit, vol. Band 24

    2019

    ISBN: 978-3-503-18850-5

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    Zeitschriftenartikel

    Anton Schmailzl, B. Quandt, M. Schmidt, S. Hierl

    In-Situ process monitoring during laser transmission welding of PA6-GF30

    Procedia CIRP, vol. 74, pp. 524-527

    2018

    DOI: 10.1016/j.procir.2018.08.131

    Abstract anzeigen

    Quasi-simultaneous laser transmission welding is preferably used for packaging sensors and electronics. In order to protect the components from moisture, a hermetic encapsulation is needed. However, local weld seam interruptions cannot be identified with the commonly used set-path monitoring. By using a pyrometer, coaxially integrated into a 3D-scanner, gaps between the joining partners can be allocated on basis of the measured temperature. However, the scattering of the heat radiation, especially caused by the fiber reinforcement of the plastics, leads to a reduction of the accessible heat radiation, which makes the identification of gaps considerably more difficult. The herein used experimental setup is characterized by a small detection spot and only by a slight weakening of the heat radiation inside the scanner. Hence, for welding PA6-GF30, the detection of small sized gaps is possible, even if a glass fiber content of 30 percent (wt.) and a weld seam width with approximately 1 mm are given.

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    Beitrag (Sammelband oder Tagungsband)

    Johannes Käsbauer, Anton Schmailzl, S. Hierl

    Simulationsgestützte Prozessentwicklung beim Laser Durchstrahlschweißen von Thermoplasten ohne absorbierende Füllstoffe

    Tagungsband zur 36. CADFEM ANSYS Simulation Conference (10.-12.10.2018; Leipzig)

    2018

    MobilExtern

    Beitrag (Sammelband oder Tagungsband)

    E. Fritz, R. Kircher, R. Palka, M. Witt, L. Blow, K. Eiler

    Electromagnetic Fields related to High Speed Transportation Systems

    ТРАНСПОРТНЫЕ СИСТЕМЫ И ТЕХНОЛОГИИ (Transportation Systems and Technology) - Conference Proceedings of Maglev2018 (5-8 September, 2018; St. Petersburg, Russia)

    2018

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, D. Armbruster, M. Dostalek, S. Steger, S. Hierl

    Strahlführungs- und -formungskonzept zur koaxialen Temperaturmessung beim scanner-basierten Laser-Durchstrahlschweißen

    Tagungsband zur 2. OTH-Clusterkonferenz 2017, Regensburg

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, B. Geissler, F. Maiwald, T. Laumer, M. Schmidt, S. Hierl

    Transformation of Weld Seam Geometry in Laser Transmission Welding by Using an Additional Integrated Thulium Fiber Laser

    Proceedings of LiM2017 - Lasers in Manufacturing (26-29 June 2017; Munich)

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, S. Hierl

    Scanner-integrierte Temperaturmesstechnik beim Laser-Durchstrahlschweißen

    Elektronisches Handout zum 20. Seminar „Laser in der Elektronikproduktion & Feinwerktechnik“ (7.+8. März 2017; Fürth)

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, S. Steger, S. Hierl

    Herausforderungen bei der Integration einer pyrometrischen Temperaturmesstechnik in 3D-Laserscansysteme

    Kalibrierung des 2D- und 3D- Arbeitsfeldes von Laser-Scan-Systemen

    2017

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    Beitrag (Sammelband oder Tagungsband)

    F. Maiwald, Anton Schmailzl, S. Hierl

    Thermo-mechanical computation of weld seam geometry in laser transmission welding

    Applied Research Conference 2017, Berlin

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Johannes Käsbauer, Anton Schmailzl, S. Hierl

    Simulative investigation on the influence of material- and process parameter on quasi-simultaneous laser transmission welding

    Poster Session

    Applied Research Conference 2017, Berlin

    2017

    Extern

    Max-Emanuel Geis

    Das Hochschulrecht im Freistaat Bayern: Handbuch für Wissenschaft und Praxis

    C.F. Müller Wissenschaft, Heidelberg

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, S. Steger, M. Dostalek, S. Hierl

    Online process monitoring at quasi-simultaneous laser transmission welding using a 3D-scanner with integrated pyrometer

    Proceedings of SPIE 9736: SPIE LASE (13-18 February 2016; San Francisco, CA, USA)

    2016

    DOI: 10.1117/12.2211705

    Abstract anzeigen

    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.