Abt, F.F.AbtBoley, M.M.BoleyWeber, R.R.WeberGraf, T.T.GrafPopko, G.G.PopkoNau, S.S.Nau2022-03-112022-03-112011https://publica.fraunhofer.de/handle/publica/37340110.1016/j.phpro.2011.03.095The comprehensive diagnostics of melt pool and keyhole dynamics is crucial in the ambitious efforts of understanding the complex behaviour of laser welding and cutting processes. A major drawback of commonly used in-situ diagnostics is the fact that high-speed cameras and other optical sensors reveal only phenomena on the surface of the process. This paper describes a novel high-speed x-ray diagnostics system that enables the view inside the samples with high spatial as well as high temporal resolution. Calibration images demonstrated the detection of features well below 250 m in steel. In combination with maximum detection rates exceeding 10,000 Hz it enables outstanding new possibilities for direct observation of the keyhole and fluid dynamics.en620conference paper