Working group
The activities of the working group are divided into the subject matters of welding simulation and arc welding, even though these two topics are closely linked.
The subject matter of welding simulation primarily concerns the calculation of welding-specific temperature fields, distortions and stresses. The long-term objective of the research activities is prediction, analysis and optimization of welded components in terms of welding distortion and residual stresses with the help of computational methods. Additional efforts will be made to enhance computation of hot and cold cracking phenomena. In order to meet these goals, cross-topic application of the currently available welding simulation methods is underway in all working groups to promote ongoing projects and to qualify those methods for reliable use on the one hand. On the other hand, those methods are continuously advanced in order to better fulfil in future the existing requirements as regards computation time and component size as well as the achievable accuracy of results and the operability, and thus to establish welding simulation as a standard tool in industrial product development.
The subject matter of arc welding basically covers both the operative weldability investigations of innovative high-performance as well as low-energy arc welding processes and the metallurgical weldability investigations of advanced materials. This task is accomplished by examining new processes in combination with state-of-the-art and future materials in view of their influence on the hot and cold cracking susceptibility of welded components. For these investigations, we have an in-house arc welding laboratory at our disposal which is equipped with various power sources and handling devices (robot, tilt-turn table, linear undercarriage). Moreover, we take for granted close cooperation with our other working groups, above all with the component testing as well as laser and hybrid welding teams.
For dealing with both subject matters in our division we have the required measuring systems in place for data acquisition, evaluation and assessment of the welding results as well as for experimental validation of the simulations. Coherent and high-quality analysis of the achieved results is thus assured for the various challenges.
Comparison between experimentally determined and numerically calculated temperature field for subsequent calculation of distortion; material H400 (1.4376), 3 kW Nd:YAG-laser melt run on plane sheet, sheet thickness 1.5 mm, vs = 6.5 m/min (enlarged picture)
Comparison between experimentally determined and numerically calculated longitudinal and transverse distortion; material H400 (1.4376), 3 kW Nd:YAG-laser melt run on plane sheet, sheet thickness 1.5 mm, vs = 6.5 m/min (enlarged picture)
High-speed video recording (6000 frames/second) of a MAG-laser hybrid welding process using tubular cored wire, delayed melting of the protruding lanciform core can clearly be distinguished
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Secretariat
Unter den Eichen 87
12205 Berlin
phone:
+49 30 8104-1559
fax:
+49 30 8104-1557