Journal of Light Metal Welding
Online ISSN : 2186-618X
Print ISSN : 0368-5306
ISSN-L : 0368-5306
Volume 58 , Issue 8
Journal of Light Metal Welding
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Technical Paper
  • Fanrong Kong, Jean-Philippe Lavoie, Klaus Kleine, Radovan Kovacevi ...
    2020 Volume 58 Issue 8 Pages 19-25
    Published: August 16, 2020
    Released: August 16, 2020

    A three-dimensional (3-D) thermo-mechanical Finite Element Model (FEM) was developed based on ANSYS

    Parametric Design Language (APDL) to study the temperature field and residual stresses in the Aluminum Alloy

    6061 plate in the formation of bead-on-plate welded by an Adjustable Ring Mode (ARM) Laser. During the weld

    process, the laser power of the ring and core of the optical fiber could be tuned separately on-the-fly. The influences

    of laser power synergy between the outer ring and the core in the ARM laser beam on the weld geometrical sizes,

    weld quality and internal soundness and, subsequently, thermally-induced residual stress distributions were studied

    by numerical modeling and experimental investigations. The weld penetration and weld width could be adjusted by

    optimizing the power distributions of the outer ring and core spot, through which the residual stress of welds could

    be also controllable, and a porosity-free weld could be achievable. The effect of process parameters on the residual

    stress concentration in the weld obtained by ARM laser was identified by the developed nonlinear thermo-mechanical

    FEM. It can be found that the residual stress distribution in the weld by ARM laser welding varies with the laser

    power ratio of center and ring parts. The maximum equivalent residual stress concentrations were always located

    at the center of the weld zone and well-distributed uniformly along the weld bead. The XRD residual stress measurement

    was also performed to validate the accuracy of the achieved numerical prediction.

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