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  • 1.
    Volpp, Joerg
    Bremer Institut für angewandte Strahltechnik GmbH, Bremen, Germany.
    Keyhole stability during laser welding – Part II: Process pores and spatters2017In: Production Engineering, ISSN 0944-6524, E-ISSN 1863-7353, Vol. 11, no 1, p. 9-18Article in journal (Refereed)
  • 2.
    Volpp, Joerg
    et al.
    Bremer Institut für angewandte Strahltechnik GmbH, Bremen, Germany.
    Vollertsen, F.
    Bremer Institut für angewandte Strahltechnik GmbH, Bremen, Germany. University of Bremen, Bremen, Germany.
    Modeling keyhole oscillations during laser deep penetration welding at different spatial laser intensity distributions2015In: Production Engineering, ISSN 0944-6524, E-ISSN 1863-7353, Vol. 9, no 2, p. 167-178Article in journal (Refereed)
  • 3.
    Volpp, Joerg
    et al.
    Bremer Institut für angewandte Strahltechnik GmbHBremenGermany.
    Vollertsen, Frank
    Bremer Institut für angewandte Strahltechnik GmbH, Bremen, Germany. University of Bremen, Bremen, Germany.
    Keyhole stability during laser welding – Part I: Modeling and Evaluation2016In: Production Engineering, ISSN 0944-6524, E-ISSN 1863-7353, Vol. 10, no 4-5, p. 443-457Article in journal (Refereed)
    Abstract [en]

    The keyhole is a requirement in order to establish the energy efficient process of laser deep penetration welding. However, the process is highly unstable which results in unwanted pore and spatter formation. In order to avoid process defects, the physical effects in the keyhole have to be better understood to find ways for compensation. This work aims to describe the keyhole properties at different welding parameters for welding of aluminum (EN AW 1050) with the help of a semi-analytical model based on energy and pressure equations and differential equations. The resulting dynamic characteristics of different keyholes are evaluated with frequency analysis of optical observations during the welding process. The spring coefficient, that describes the radial pressure change at radius deviation, is a good indicator for the resulting keyhole dynamics. Dynamic behavior is influenced by the spatial laser intensity distribution, while higher frequencies at lower amplitudes are found at a Top Hat distribution compared to a Gaussian intensity profile.

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