Energy Coupling Efficiency in Laser Surface Treatment.

Dausinger, Friedrich; Shen, Jialin

doi:10.2355/isijinternational.33.925

Cited by 105 publications

(70 citation statements)

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“…The angle was different from that of the NIR observation (45 degrees), but the influence is negligibly small. According to the theoretical Fresnel formula and the complex refraction index of iron, the difference of  (or A) between 10 degrees and 45 degrees is very small for a non-polarised beam; less than 1% [25].…”

Section: Methods Of Experimentsmentioning

confidence: 99%

Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure

Hirano¹,

Fabbro²,

Muller³

2011

J. Phys. D: Appl. Phys.

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. . It is thus essential to estimate the recoil pressure in order to describe physical processes or to carry out numerical simulations. However, there exists no quantitative estimation of the recoil pressure near the boiling temperature (T v ), which is particularly important in welding process. In this study we experimentally investigated the recoil pressure of pure iron around T v . The main interest was to determine the threshold surface temperature to start deformation of melt surface. Using camera-based temperature measurement with accurate evaluation of emissivity from experiment, it was shown that the surface temperature has to reach T v to initiate the melt surface deformation. This result provides the first experimental evidence for the frequently used assumption that a deep keyhole welding requires surface temperature over T v . It is indicated also that, in normal gas-assisted laser cutting process, the recoil pressure hardly contributes to material ejection when the surface temperature is lower than T v , as opposed to commonly believed presumption.

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Section: Methods Of Experimentsmentioning

confidence: 99%

Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure

Hirano¹,

Fabbro²,

Muller³

2011

J. Phys. D: Appl. Phys.

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“…Absorption in a keyhole can vary in a very complicated way, regarding the surface temperature [9] or hydrodynamic instabilities on the free surface [28]. In order to avoid the modelling of these complex effects, the absorption coefficients measured in [30] is used for several laser peak power corresponding to the percussion regime (Fig.…”

Section: Intake Heat Flux On the Free Surface ∂ Smentioning

confidence: 99%

Modeling laser drilling in percussion regime using constraint natural element method

et al. 2015

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The laser drilling process is the main process used in machining procedures on aeronautic engines, especially in the cooling parts. The industrial problematic is to reduce geometrical deviations of the holes and defects during manufacturing. The interaction between a laser beam and an absorbent metallic matter in the laser drilling regime involves thermal and hydrodynamical phenomenon. Their role on the drilling is not yet completely understood and a realistic simulation of the process could contribute to a better understanding of these phenomenon. The simulation of such process induces strong numerical difficulties. This work presents a physical model combined with the use of the original Constraint Natural Element Method to simulate the laser drilling. The physical model includes solid/liquid and liquid/vapor phase transformations, the liquid ejection and the convective and conductive thermal exchanges. It is the first time that all these phenomena are included in a modelling and numerically solved in a 2D axisymmmetric problem. Simulations results predict most of measurements (hole geometry, velocity of the liquid ejection and laser drilling velocity) without adjusting any parameters.

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“…Pour les matériaux métalliques, le coefficient d'absorption est d'autant plus fort que la longueur d'onde est élevée [1]. L'énergie laser sera donc absorbée sur une épaisseur plus faible et il sera donc plus facile d'atteindre la température de vaporisation dans ce volume plus faible.…”

Section: Laser Et Transport De Faisceauunclassified

Nettoyage de surfaces de grandes dimensions par laser à excimères

Sentis¹,

Delaporte²,

Gastaud³

et al. 2001

J. Phys. IV France

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Résumé : Cet article présente une étude effectuée sur le nettoyage par ablation laser UV de contaminants fixés à la surface de matériaux et sur le développement de systèmes laser permettant le traitement automatisé de grandes surfaces. Les conditions d'irradiation permettant la suppression des oxydes par ablation laser UV et garantissant l'innocuité du procédé ont été définies. Le dispositif de nettoyage est constitué d'un laser XeCl, d'un système de transport par fibres optiques, d'une buse d'aspiration et d'un système permettant le contrôle en temps réel de la qualité du nettoyage.

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Energy Coupling Efficiency in Laser Surface Treatment.

Cited by 105 publications

References 0 publications

Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure

Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure

Modeling laser drilling in percussion regime using constraint natural element method

Nettoyage de surfaces de grandes dimensions par laser à excimères

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