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Possible explanations for different surface quality in laser cutting with 1 micron and 10 microns beams

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

URI
http://hdl.handle.net/10985/7618
DOI
10.2351/1.3672477
Date
2012
Journal
Journal of Laser Applications

Abstract

In laser cutting of thick steel sheets, quality difference is observed between cut surfaces obtained with 1 micron and 10 micron laser beams. This paper investigates physical mechanisms for this interesting and important problem of the wavelength dependence. First, striation generation process is described, based on a 3D structure of melt flow on a kerf front, which was revealed for the first time by our recent experimental observations. Two fundamental processes are suggested to explain the difference in the cut surface quality: destabilization of the melt flow in the central part of the kerf front and downward displacement of discrete melt accumulations along the side parts of the front. Then each of the processes is analyzed using a simplified analytical model. The results show that in both processes, different angular dependence of the absorptivity of the laser beam can result in the quality difference. Finally we propose use of radial polarization to improve the quality with the 1 micron wavelength.

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