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151 Aktuelle Fachpublikationen zum Thema Laser

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Hybrid simulation of laser deep penetration welding

10.01.2018 | C. Schöler, A. Haeusler, V. Karyofylli, M. Behr, W. Schulz, A. Gillner, M. Niessen, Materialwissenschaft und Werkstofftechnik, 2018

Abstract In laser deep penetration welding, the knowledge on the temperature history of the material is of great interest for the assessment of the quality properties of the weld. For this purpose a hybrid process model that enables the fast calculation of temperature distributions as a ...

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An automatable algorithm for measurement of fluid flow during laser fusion cutting using in‐situ trim cut analysis

10.01.2018 | U. Jansen, D. Arntz, D. Petring, W. Schulz, R. Poprawe, Materialwissenschaft und Werkstofftechnik, 2018

Abstract Irregularities inside the fluid flow in laser fusion cutting of sheet metals cause quality defects like large striation depths or adhered dross. Trim-cut analysis is used to measure the flow velocities of the molten material by high speed imaging. The so-called streak analysis creates ...

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Modelling approach towards tailored grain structure in laser processing

10.01.2018 | B. Pustal, T. Vossel, A. Bührig-Polaczek, D. Arntz, A. Haeusler, A. Gillner, R. Poprawe, A. Schwedt, J. Mayer, U. Ja ..., Materialwissenschaft und Werkstofftechnik, 2018

Abstract Due to the change in grain size during laser processing in the heat-affected zone and the solidifying material, the potential of cracking, surface hardening, and decrease in weldability, corrosion resistance and fatigue life may result. It is shown that through combining ...

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Modelling approach towards tailored grain structure in laser processing

10.01.2018 | B. Pustal, T. Vossel, A. Bührig-Polaczek, D. Arntz, A. Haeusler, A. Gillner, R. Poprawe, A. Schwedt, J. Mayer, U. Ja ..., Materialwissenschaft und Werkstofftechnik, 2018

Abstract Due to the change in grain size during laser processing in the heat-affected zone and the solidifying material, the potential of cracking, surface hardening, and decrease in weldability, corrosion resistance and fatigue life may result. It is shown that through combining ...

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Characterisation of quasi‐stationary temperature fields in laser welding by infrared thermography

10.01.2018 | J.A. Francis, S. Gach, S. Olscho, U. Reisgen, A. Haeusler, A. Gillner, R. Poprawe, Materialwissenschaft und Werkstofftechnik, 2018

Abstract In this work, high-speed thermography is shown to effectively capture quasi-stationary temperature fields during the laser welding of steel plates. This capability is demonstrated for two cases, with one involving the addition of a ferritic-bainitic filler wire, and the other ...

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Influence of process strategy on distortion and residual stresses for the powder based laser metal deposition process

10.01.2018 | N. Pirch, H. Schleifenbaum, S. Linnenbrink, A. Gasser, R. Poprawe, M. Niessen, Materialwissenschaft und Werkstofftechnik, 2018

Abstract Laser metal deposition (LMD) induces a complex 3-axis residual stress state, which superimposes the external service stresses and can cause unpredicted in-service failures. To optimize the process it is important to know the mechanisms and the opportunities to influence the occurrence ...

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Autophagy Caught in the Act: a Supramolecular FRET Pair Based on an Ultrastable Synthetic Host‐guest Complex Visualizes Autophagosome‐lysosome Fusion

21.12.2017 | Meng Li, Ara Lee, Kyung Lock Kim, James Murray, Annadka Shrinidhi, Gihyun Sung, Kyeng Min Park, Kimoon Kim, Angewandte Chemie, 2017

A supramolecular FRET pair based on the ultrahigh binding affinity between cyanine 3‐conjugated cucurbit[7]uril (CB[7]‐Cy3) and cyanine 5‐conjugated adamantylamine (AdA‐Cy5) was exploited as a new synthetic tool for imaging cellular processes in live cells. Confocal laser scanning microscopy ...

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Chemicals on demand: Photo‐induced release from nano‐ and microparticle containers

07.12.2017 | Ulrich S. Schubert, Christoph Englert, Ivo Nischang, Cornelia Bader, Philipp Borchers, Julien Alex, Michael Proehl, ..., Angewandte Chemie, 2017

A benzoin‐derived diol linker was synthesized and used to create biocompatible polyesters, which can be fully decomposed on demand triggered by UV light. Extensive structural optimization of the linker unit was performed to enable a defined encapsulation of structurally diverse organic compounds ...

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Wavelength Gated Dynamic Covalent Chemistry

24.10.2017 | Hendrik Frisch, David Marschner, Anja Goldmann, Christopher Barner-Kowollik, Angewandte Chemie, 2017

Precise control of chemical reactions constitutes the foundation of synthesis. Classically, judicious functional group choice as well as external factors such as temperature and catalysts are used to exert control, yet the recent renaissance of light as a medium to direct chemical synthesis ...

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Wavelength Gated Dynamic Covalent Chemistry

24.10.2017 | Hendrik Frisch, David Marschner, Anja Goldmann, Christopher Barner-Kowollik, Angewandte Chemie, 2017

Precise control of chemical reactions constitutes the foundation of synthesis. Classically, judicious functional group choice as well as external factors such as temperature and catalysts are used to exert control, yet the recent renaissance of light as a medium to direct chemical synthesis ...

mehr

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