1. 1-3 of 3
    1. Process control and quality assurance in remote laser beam welding by optical coherence tomography

      Process control and quality assurance in remote laser beam welding by optical coherence tomography

      Remote laser beam welding significantly outperforms conventional joining techniques in terms of flexibility and productivity. This process benefits in particular from a highly focused laser radiation and thus from a well-defined heat input. The small spot sizes of high brilliance laser beam sources, however, require a highly dynamic and precise positioning of the beam. Also, the laser intensities typically applied in this context result in high process dynamics and in demand for a method to ensure a sufficient weld quality. A novel sensor concept for remote laser processing based on optical coherence tomography (OCT) was used for both quality assurance ...

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    2. Inline weld depth measurement for high brilliance laser beam sources using optical coherence tomography

      Inline weld depth measurement for high brilliance laser beam sources using optical coherence tomography

      As a result of the rapidly growing importance of applications in electro mobility that require a precisely defined laser weld depth, the demand for inline process monitoring and control is increasing. To overcome the challenges in process data acquisition, this paper proposes the application of a novel sensor concept for deep penetration laser beam welding with high brilliance laser sources. The experiments show that optical coherence tomography (OCT) can be used to measure the weld depth by comparing the distance to the material surface with the distance to the keyhole bottom measured by the sensor. Within the presented work, the ...

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    3. 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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    1-3 of 3
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