Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Please note that all times are shown in the time zone of the conference. The current conference time is: 27th Jan 2022, 09:47:20pm CET

Program for LiM 2021
Macro: Welding Simulation
Tuesday, 22/June/2021:
11:15am - 12:30pm

Session Chair: Eveline Reinheimer, Universität Stuttgart, Institut für Strahlwerkzeuge, Germany
Location: Room 1
ICM Ground Floor 125

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11:15am - 11:45am

Invited Talk: Numerical Simulations as Versatile Tool for Understanding and Optimizing Laser Material Processing

Andreas Otto, M. Buttazzoni, C. Zenz

Vienna University of Technology, Austria

Multiphysical simulations of laser material processing enable for a deep insight into the process dynamics. Thus they support gaining thorough process knowledge prerequisite for optimizing the process parameters with respect to the process result.

Within the presentation an introduction into a simulation model developed within the past 15 years and capable for simulating virtually every laser process from the micro to the macro scale, from ultrafast to laser based additive processes, is given. Results from basic research work and industrial applications with a focus on deep penetration welding demonstrate the capabilities of the model. Furthermore an outlook on current developments including the implementation of grain growth models and thermo-mechanics is given.​

11:45am - 12:00pm

Experimental and numerical analysis of local gas supplies for spatter reduced high speed laser beam welding

Leander Schmidt, Klaus Schricker, Jean Pierre Bergmann

Technische Universität Ilmenau, Production Technology Group, Germany

Spatter formation is a major issue in deep penetration welding with solid-state lasers at high welding speeds above 8 m/min. To avoid spatter formation, the use of local gas supply proved to be very effective. This publication examines the flow conditions and mechanical effects of a local supply of Argon/Helium by welding stainless steel (X5CrNi18-10/AISI304) at welding speeds beyond 8 m/min to get a deeper understanding of the acting mechanisms. By varying the flow rate, the flow field characteristics were visualized by Schlieren imaging and quantified by Schlieren imaging velocimetry (flow pattern, flow velocity). In order to specify the resulting pressure field, a computational fluid dynamics analysis have been performed based on a k-ω-SST multi component turbulence model. By combining the experimental und numerical findings, it was possible to derive a comprehensive model representation of the fundamental effect mechanisms.

12:00pm - 12:15pm

Numerical study of the bulging effect in deep penetration laser beam welding

Antoni Artinov1, Xiangmeng Meng1, Marcel Bachmann1, Michael Rethmeier3,1,2

1BAM Federal Institute for Materials Research and Testing, Germany; 2Fraunhofer Institute for Production Systems and Design Technology, Pascalstraße 8-9, 10587 Berlin, Germany; 3Institute of Machine Tools and Factory Management, Technische Universität Berlin, Pascalstraße 8-9, 10587 Berlin, Germany

This article is devoted to the study of the bulging effect in deep penetration laser beam welding. Experimental and numerical investigations are combined to study the relationship between the bulging effect and the hot cracking formation, as well as the mixing of alloying elements in the weld pool. The widening of the molten pool is visualized by utilizing a butt joint configuration of transparent quartz glass and 12 mm thick structural steel. The weld pool shape is monitored in real time with a high-speed camera and two thermal imaging cameras. A simplified numerical model with a fixed keyhole shape based on experimental observations is applied to examine the bulge influence on hot cracking during complete penetration. Additionally, a numerical model considering a dynamic keyhole is developed to analyze the mixing of alloying elements during partial penetration. The link between the bulge and the studied phenomena is found to be significant.

12:15pm - 12:30pm

Numerical simulation of power control in laser-assisted metal-polymer joining

Klaus Schricker, Jean Pierre Bergmann

Technische Universität Ilmenau, Production Technology Group, Germany

Laser-assisted joining enables a direct connection between polymers and metals without using additional elements (e.g. screws, rivets) or adhesives. The process is well known in terms of surface pretreatment, achievable mechanical properties and materials. However, the quality of the joint is affected by varying manufacturing conditions, e.g. heat accumulation at edges, heating of the clamping device or different material batches. The article is dedicated to power control in laser-based joining of polymers with metals for this reason. A PID controller was integrated to control the beam power of a diode laser as a function of temperature based on a transient thermal model. The investigations were carried out on polypropylene in combination with aluminum and high-alloy steel. A comparison of surface/interface temperatures, controlled/uncontrolled processes and the introduction of disturbances allow conclusions on process control and on implementation in real production processes.

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