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Ki, Hyungson
Laser Processing & Multiphysics Systems Laboratory
Research Interests
  • Laser materials processing

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Finite-difference time-domain simulation of laser beam absorption in fully penetrated keyholes

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Title
Finite-difference time-domain simulation of laser beam absorption in fully penetrated keyholes
Author
Deng, ChunKi, Hyungson
Keywords
METALS
Issue Date
201310
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.114, no.16, pp.164901 -
Abstract
Accurate predictions of laser beam absorptance and how laser beam energy is distributed on a keyhole surface are arguably the most important but challenging tasks in the study of laser keyhole welding. In this article, laser interaction with fully penetrated keyholes has been studied by solving the Maxwell equations for electrodynamics using the finite-difference time-domain method with the Drude model for metals. Based on the experimental observations of Fabbro [J. Phys. D: Appl. Phys. 38, 1881-1887 (2005)], the keyhole is simplified as a tilted cylinder, and we have extensively investigated laser absorption phenomena considering three materials (Fe, Sn, and Al), three beam polarizations (two linear and circular), two laser beam wavelengths (1.06 μm and 10.6 μm), and six keyhole tilting angles (0°, 10°, 20°, 30°, 40°, and 45°). To the best of the authors' knowledge, this is the first electrodynamic simulation of a laser manufacturing process and reveals some interesting findings concerning laser beam absorption characteristics that can be only obtained by full electrodynamic simulations.
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DOI
http://dx.doi.org/10.1063/1.4826207
ISSN
0021-8979
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MNE_Journal Papers
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