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Melt Pool and Keyhole Behavior Analysis for Deep Penetration Laser Welding

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

URI
http://hdl.handle.net/10985/7616
DOI
10.1088/0022-3727/43/44/445501
Date
2010
Journal
Journal of Physics D: Applied Physics

Résumé

One usually defines the main characteristic of the welding performances of a given laser system by its “penetration curve” that corresponds to the welding depth as a function of the welding speed Vw for a given set of operating parameters. Analysis of a penetration curve is interesting and gives very fruitful results. Coupled with high speed video imaging of melt pool surface and ejected plume behaviors, the analysis of this penetration curve on a very large range of welding speeds, typically from 0 to 50 m/min, has allowed us to observe very different and characteristic regimes. These regimes are mainly characterized by the physical processes by which they impede the laser beam penetration inside the material. We show that it is only at rather high welding speeds that these limiting processes are reduced. Consequently the scaling law of welding depth with welding speed is in agreement with adapted modeling of this process. On the other hand, as the welding speed is reduced, different effects depending of the weld pool dynamics and plume interaction, strongly disturb the keyhole stability and are responsible of the deviation of the penetration curve from the previous modeling that agrees with a 1/Vw scaling law. A corresponding criterion for the occurrence of this effect is defined.

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PIMM_JPhysD_2010_FABBRO.pdf
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Documents liés

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  • 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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