Gas investigation for laser drilling
TypeArticles dans des revues avec comité de lecture
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 tube. By this way, the position of shock waves in the supersonic jet and near the target surface is revealed. From this characterization, the distance between exit nozzle and target can be optimized to induce higher pressure on surface and protect optics from liquid ejection. On the other hand, metal liquid and vapor jets from irradiated target are observed with a high-speed camera (100 000 Img/sec). Without assistance gas, a surprising result on the video is a shock wave inside the metal vapor jet like a supersonic flow. The assistance gas limits the propagation of the vapor and facilitates the deposition of metallic liquid around the front surface holes.
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Measurement of laser absorptivity for operating parameters characteristic of laser drilling regime SCHNEIDER, Matthieu; BERTHE, Laurent; FABBRO, Rémy; MULLER, Maryse (IOP, 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 ...
SCHNEIDER, Matthieu; BERTHE, Laurent; MULLER, Maryse; FABBRO, Rémy (AIP, 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 ...
Investigating ramp wave propagation inside silica glass with laser experiments and molecular simulations RENOU, Richard; BERTHE, Laurent; GUIN, Jean-Pierre; LOISON, Didier; SANGLEBOEUF, Jean-Christophe; NIVARD, Mariette; DEREURE, Corentin; LESCOUTE, Emilien; SOULARD, Laurent (Magdeburger Verein fur Technische Mechanik e. V., 2018)Under elastic shock compression silica glass exhibits a very specific behaviour. A shock propagating inside a material is usually seen as the propagation of a discontinuity. However in silica glass, shocks are unstable and ...
Temperature measurement of laser heated metals in highly oxidizing environment using 2D single-band and spectral pyrometry MULLER, Maryse; FABBRO, Rémy; EL-RABII, Hazem; HIRANO, Koji (Laser Institute of America, 2012)Calibration and validation of two temperature measurement techniques both using optical pyrometry, usable in the framework of the study of the heated metals in highly oxidizing environments and more generally during laser ...
Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure HIRANO, Koji; FABBRO, Rémy; MULLER, Maryse (IOP, 2011)Recoil pressure is the principal driving force of molten metal in laser processing in the intensity range of 10^-1 ~ 10^2 MW/cm2. It is thus essential to estimate the recoil pressure in order to describe physical processes ...