Method for cutting C—Mn steel with a fiber laser
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsFrancis Briand, Karim Chouf, Hakim Maazaoui
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Abstract
The invention relates to a laser cutting method for cutting a C—Mn steel workpiece, characterized in that laser beam generation means comprising at least one silica fiber with an ytterbium-doped core is used to generate the laser beam. Preferably, the ytterbium-based fiber has a wavelength between 1.07 and 1.1 μm, preferably 1.07 μm, the quality factor of the laser beam is between 0.33 and 8 mm.mrad, and the laser beam has a power of between 0.1 and 25 kW. The assistance gas for the laser beam is chosen from nitrogen, helium, argon, oxygen, CO2 and mixtures thereof, and, optionally, it further contains one or more additional compounds chosen from H2 and CH4.
Claims9
A laser cutting method for cutting a C—Mn steel workpiece, wherein laser beam generation means comprising at least one ytterbium-containing fiber for generating a laser beam and an assistance gas for the laser beam are used, and in that the workpiece to be cut has a thickness between 2 mm and 30 mm, the quality factor of the laser beam is between 1 mm.mrad and 8 mm.mrad, and the assistance gas for said laser beam is oxygen and the assistance gas pressure is between 0.2 bar and 0.1 bar.
Dependencies are inferred from the claim text.