1. Novel approach for weld depth determination using optical coherence tomography measurement in laser deep penetration welding of aluminum and steel

    Novel approach for weld depth determination using optical coherence tomography measurement in laser deep penetration welding of aluminum and steel

    The optical coherence tomography (OCT) is a measuring technology which is well-established in medical engineering since the early 1990s. More recently, the technology found its way into laser materials processing where it is used for seam tracking and inspection and also for monitoring and control of deep-penetration laser welding. In this work, deep-penetration laser welding of aluminum and steel using an OCT-system for in-process monitoring of the weld depth was investigated. It is shown that statistical data processing is mandatory to extract the actual keyhole depth. Therefore, two different measures, percentile filtering and considering the frequency distribution of the OCT-data ...

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