@inproceedings{SchmailzlQuandtHierletal., author = {Schmailzl, Anton and Quandt, Benjamin and Hierl, Stefan and Schmidt, Michael}, title = {Correlation between Joint Strength and Process Temperature in Quasi-Simultaneous Laser Transmission Welding of Polyamide 6}, series = {Proceedings of LiM2019 - Lasers in Manufacturing (23 June 2019, Munich)}, booktitle = {Proceedings of LiM2019 - Lasers in Manufacturing (23 June 2019, Munich)}, publisher = {Wissenschaftliche Gesellschaft Lasertechnik e.V.}, pages = {1 -- 10}, abstract = {The joint strength is gaining importance in quasi -simultaneous laser transmission welds, especially in structural components. A correlation between the joint strength and a process characteristic is a basic requirement for selecting the best process parameter setting. In this work, the temperature is measured during welding polyamide 6 by using a scanner-integrated pyrometer with an InGaAs-detector. The filtering of the heat radiation in the upper joining partner is taken into account by calibrating the mea surement system. By this, the measured temperature signal represents the temperature in the joining zone. A correlation is found between the measured temperature and the resulting joint strength. Moreover, high joint strengths are also seen for welds with short welding times, as far as the temperature is sufficiently high. With this knowledge, a process window can be derived easily in order to produce welds with high strength and short welding times.}, language = {en} } @inproceedings{QuandtSchroeckerHierl, author = {Quandt, Benjamin and Schr{\"o}cker, Korbinian and Hierl, Stefan}, title = {Prozess{\"u}berwachung beim quasi-simultanen Laser-Durchstrahlschweißen glasfaserverst{\"a}rkter Thermoplaste}, series = {9. Landshuter Leichtbau-Colloquium: Leichtbau in Forschung und industrieller Anwendung von der Nano- bis zur Makroebene, 27. / 28. Februar 2019 Hochschule Landshut, Tagungsband zum Colloquium}, booktitle = {9. Landshuter Leichtbau-Colloquium: Leichtbau in Forschung und industrieller Anwendung von der Nano- bis zur Makroebene, 27. / 28. Februar 2019 Hochschule Landshut, Tagungsband zum Colloquium}, editor = {Huber, Otto and Bicker, Marc and Patzelt, Peter}, publisher = {LC-Verlag}, address = {Landshut}, pages = {56 -- 64}, language = {de} } @article{QuandtSchaeferHierl, author = {Quandt, Benjamin and Sch{\"a}fer, Felix and Hierl, Stefan}, title = {Heiße Infos aus schwachem Temperatursignal}, series = {Kunststoffe}, journal = {Kunststoffe}, number = {12}, publisher = {Hanser}, address = {M{\"u}nchen}, issn = {0945-0084}, pages = {65 -- 68}, language = {de} } @inproceedings{SchmailzlQuandtSchmidtetal., author = {Schmailzl, Anton and Quandt, Benjamin and Schmidt, Michael and Hierl, Stefan}, title = {In-Situ Process Monitoring during Laser Transmission Welding of PA6-GF30}, series = {Procedia CIRP}, volume = {74}, booktitle = {Procedia CIRP}, doi = {10.1016/j.procir.2018.08.131}, pages = {524 -- 527}, abstract = {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.}, language = {en} } @inproceedings{Quandt, author = {Quandt, Benjamin}, title = {Effect of the Detection Spot Size on pyrometric Temperature Signal at quasi-simultaneous Laser Transmission Welding}, series = {Applied Research Conference 2018, ARC 2018, 10 July 2018, Deggendorf}, booktitle = {Applied Research Conference 2018, ARC 2018, 10 July 2018, Deggendorf}, editor = {Mottok, J{\"u}rgen and Reichenberger, Marcus and Bogner, Werner}, publisher = {pro Business GmbH}, address = {Berlin}, pages = {261 -- 264}, language = {en} }