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7483 |
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Wednesday, May 04, 2022, Hall G2 2:40 PM Precision Melt Engineering |
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Space- and time-resolved deformation and temperature measurements of substrate plates during laser powder deposition welding |
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Lukas Oster / RWTH Aachen University, Germany Uwe Reisgen / RWTH Aachen University, Germany J. Schleifenbaum/ RWTH Aachen University, Germany R. Sharma/ RWTH Aachen University, Germany M.-N. Bold/ RWTH Aachen University, Germany K. Mäde*/ RWTH Aachen University, Germany |
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During laser metal deposition the substrate-material deforms. This deformation is result of a multitude of effects throughout the manufacturing process. In order to measure precisely the time temperature deformation history an experimental setup is conceived. Consisting of a stereo camera system in order to determine 3D deformations based on a stochastically distributed speckle pattern applied on the surface of the substrate. Additionally, the temperature is measured on the underside of the substrate by means of thermal camera. The LMD structure is applied on the opposite side of the measurement therefore there is no chance of the laser beam disrupting the optical measurement of temperature and deformation. Due to the areal nature of the measurement system chosen it is possible to achieve high temporal and spatial resolution in order to identify critical heat distributions and welding path geometries, which lead to deformation. This work proposes a novel measurement setup and provides possible use cases for optimizing trajectory planning during additive manufacturing processes based on several exemplary path geometries. |