Product Code: ICA13_502

A Comparative Experimental Study of Laser Fusion Cutting of Steel with 1 Micron and 10 Microns Laser Wavelengths
Koji Hirano, Nippon Steel & Sumitomo Metal Corporation; Futtsu, Chiba Japan
Remy Fabbro, Pimm Laboratory, Arts Et Metiers Paristech - Cnrs; Paris France
Presented at ICALEO 2013

This study aims to contribute to a better understanding of the cut surface quality difference between a laser with 1 micron wavelength (fiber or disc laser) and a 10.6 microns CO2 laser for laser fusion cutting of thick steel plates. Laser cutting of SUS304 stainless steel with thicknesses of 3, 5 and 8 mm was performed with a multimode fiber laser and a CO2 laser with the same power and comparative beam focusing characteristics. As already reported in the literature, the fiber laser exhibits worse surface quality for thicknesses with 5 and 8 mm. The result shows that the degradation of the surface roughness occurs when the cutting velocity becomes smaller than 1.5 m/min. We measured also the inclination angle of the kerf front (alpha) and the result shows that this range of cutting velocity corresponds to alpha

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