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000622958 1001_ $$0P:(DE-H253)PIP1105432$$aBrueggenjuergen, Jan$$b0$$eCorresponding author
000622958 245__ $$aAnalyzing multispectral emission and synchrotron data to evaluate the quality of laser welds on copper
000622958 260__ $$aOrlando, Fla.$$bLaser Inst. of America$$c2024
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000622958 520__ $$aThe validation of laser welding of metallic materials is challenging due to its highly dynamic processes and limited accessibility to the weld. The measurement of process emissions and the processing laser beam are one way to record highly dynamic process phenomena. However, these recordings always take place via the surface of the weld. Phenomena on the inside are only implicitly recognizable in the data and require further processing. To increase the validity of the diagnostic process, the multispectral emission data are synchronized with synchrotron data consisting of in situ high-speed images based on phase contrast videography. The welding process is transilluminated by synchrotron radiation and recorded during execution, providing clear contrasts between solid, liquid, and gaseous material phases. Thus, dynamics of the vapor capillary and the formation of defects such as pores can be recorded with high spatial and temporal resolution of <5 μm and >5 kHz. In this paper, laser welding of copper Cu-ETP and CuSn6 is investigated at the Deutsches Elektronen-Synchrotron (DESY). The synchronization is achieved by leveraging a three-stage deep learning approach. A preprocessing Mask-R-CNN, dimensionality reduction PCA/Autoencoders, and a final LSTM/Transformer stage provide end-to-end defect detection capabilities. Integrated gradients allow for the extraction of correlations between defects and emission data. The novel approach of correlating image and sensor data increases the informative value of the sensor data. It aims to characterize welds based on the sensor data not only according to IO/NIO but also to provide a quantitative description of the defects in the weld. 
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000622958 7001_ $$0P:(DE-H253)PIP1103346$$aSpurk, Christoph$$b1
000622958 7001_ $$0P:(DE-H253)PIP1087670$$aHummel, Marc$$b2
000622958 7001_ $$aFranz, Christoph$$b3
000622958 7001_ $$0P:(DE-H253)PIP1092116$$aHäusler, Andrè$$b4
000622958 7001_ $$0P:(DE-H253)PIP1090446$$aOlowinsky, Alexander$$b5
000622958 7001_ $$0P:(DE-H253)PIP1002967$$aBeckmann, Felix$$b6
000622958 7001_ $$0P:(DE-H253)PIP1030371$$aMoosmann, Julian$$b7
000622958 773__ $$0PERI:(DE-600)2084611-3$$a10.2351/7.0001600$$gVol. 36, no. 3, p. 032032$$n3$$p032032$$tJournal of laser applications$$v36$$x1042-346X$$y2024
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