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Depth dependence and keyhole stability at threshold, for different laser welding regimes

Article dans une revue avec comité de lecture
Auteur
FABBRO, Remy
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/18375
DOI
10.3390/app10041487
Date
2020
Journal
Applied Sciences

Résumé

Depending of the laser operating parameters, several characteristic regimes of laser welding can be observed. At low welding speeds, the aspect ratio of the keyhole can be rather large with a rather vertical cylindrical shape, whereas at high welding speeds, low aspect ratios result, where only the keyhole front is mainly irradiated. For these different regimes, the dependence of the keyhole (KH) depth or the keyhole threshold, as a function of the operating parameters and material properties, is derived and their resulting scaling laws are surprisingly very similar. This approach allows us to analyze the keyhole behavior for these welding regimes, around their keyhole generation thresholds. Specific experiments confirm the occurrence and the behavior of these unstable keyholes for these conditions. Furthermore, recent experimental results can be analyzed using these approaches. Finally, this analysis allows us to define the aspect ratio range for the occurrence of this unstable behavior and to highlight the importance of laser absorptivity for this mechanism. Consequently, the use of a short wavelength laser for the reduction of these keyhole stability issues and the corresponding improvement of weld seam quality is emphasized.

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Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Measurement of laser absorptivity for operating parameters characteristic of laser drilling regime 
    Article dans une revue avec comité de lecture
    BERTHE, Laurent; FABBRO, Rémy; MULLER, Maryse; ccSCHNEIDER, Matthieu (IOP Publishing, 2008)
    Laser drilling in the percussion regime is commonly used in the aircraft industry to drill sub-millimetre holes in metallic targets. Characteristic laser intensities in the range of 10 MW cm−2 are typically employed for ...
  • A fast method for morphological analysis of laser drilling holes 
    Article dans une revue avec comité de lecture
    BERTHE, Laurent; MULLER, Maryse; FABBRO, Rémy; ccSCHNEIDER, Matthieu (Laser Institute of America, 2010)
    This paper presents an original method for analyzing laser drilled holes. The so-called Direct Observation of Drilled hOle (DODO) method is introduced and its applications. The hole characterization that’s been made is ...
  • Gas investigation for laser drilling 
    Article dans une revue avec comité de lecture
    BERTHE, Laurent; FABBRO, Rémy; MULLER, Maryse; NIVARD, Mariette; ccSCHNEIDER, Matthieu (Laser Institute of America, 2007)
    This article deals with the gas effect on percussion laser drilling in ms pulse duration range. On the one hand, the flow of assistance gas jet is investigated with and without a target using a strioscopy setup and Pitot’s ...
  • Experimental investigation of hydrodynamics of melt layer during laser cutting of steel 
    Article dans une revue avec comité de lecture
    HIRANO, Koji; FABBRO, Rémy (IOP Publishing, 2011)
    In laser cutting process, understanding of hydrodynamics of melt layer is significant, because it is an important factor which controls the final quality. In this work, we observed hydrodynamics of melt layer on kerf front ...
  • 3D heat transfer model of hybrid laser Nd : Yag-MAG welding of a S355 steel and experimental validation 
    Article dans une revue avec comité de lecture
    LE GUEN, Emilie; CARIN, Muriel; FABBRO, Rémy; COSTE, Frédéric; LE MASSON, Philippe (Elsevier, 2011)
    A three-dimensional heat transfer model was developed to predict the temperature fields, the weld geometry and the shape of the solidified weld reinforcement surface during hybrid laser-MAG arc welding of fillet joints. ...

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