The present article is dedicated to the study of the evolution of the keyhole obtained during the drilling of samples of Zinc by YAG laser beam. Two experimental methods are used to observe the shape of the keyhole. The first one is the Direct observation of Drilled hOle, that lets to obtain the shape of the keyhole for different laser powers and different pulse durations. The observations are carried out after drilling. The second one needs to clamp the zinc sheet with a quartz glass. This glass is chosen because of its excellent thermal shock resistance and its high light transmittance. The observation of the keyhole during the drilling shape is then realized through the quartz with a high-speed CCD camera. The evolution of the shapes of the keyhole obtained by both methods lets to highlight the role of the multiple reflections on the shape of the keyhole. When multiple reflections occur, the absorption of the energy by the wall of the keyhole increases and consequently the depth of the keyhole increases. This phenomenon was verified experimentally: in the first method, the multiple reflection of the laser beam on the wall of the keyhole occurs, whereas, for the second experimental set-up, it can be considered that there is only one impact of the laser beam on the keyhole walls. This result was theoretically proved by calculating the absorption for different shapes of the keyhole, in both cases: one reflection and multiple reflections, using the ray tracing method.
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ICALEO 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing
September 23–27, 2012
Anaheim, California, USA
ISBN:
978-0-912035-96-3
PROCEEDINGS PAPER
Comparison of keyhole characteristics obtained by two experimental methods: The “direct observation of drilled hole” method and the “sandwich” method
Simone Matteï;
Simone Matteï
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS / Université de Bourgogne
, IUT - 12, rue de la Fonderie – 71200 Le Creusot, France
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Jean-Marie Jouvard;
Jean-Marie Jouvard
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS / Université de Bourgogne
, IUT - 12, rue de la Fonderie – 71200 Le Creusot, France
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Massaud Mostafa;
Massaud Mostafa
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS / Université de Bourgogne
, IUT - 12, rue de la Fonderie – 71200 Le Creusot, France
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Iryna Tomashchuk;
Iryna Tomashchuk
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS / Université de Bourgogne
, IUT - 12, rue de la Fonderie – 71200 Le Creusot, France
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Henri Andrzejewski
Henri Andrzejewski
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS / Université de Bourgogne
, IUT - 12, rue de la Fonderie – 71200 Le Creusot, France
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Published Online:
September 01 2012
Citation
Simone Matteï, Jean-Marie Jouvard, Massaud Mostafa, Iryna Tomashchuk, Henri Andrzejewski; September 23–27, 2012. "Comparison of keyhole characteristics obtained by two experimental methods: The “direct observation of drilled hole” method and the “sandwich” method." Proceedings of the ICALEO 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. ICALEO 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Anaheim, California, USA. (pp. pp. 59-64). ASME. https://doi.org/10.2351/1.5062514
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