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AssigneesL'Air Liquide, Societe Anonyme pour I'Etude et I'Exploitation des Procedes Georges Claude, Air Liquide Welding France
InventorsFrancis BRIAND, Karim CHOUF, Hakim MAAZAOUI
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The invention relates to a laser cutting method for cutting a stainless steel workpiece using laser beam generation means comprising a silica fibre with an ytterbium-doped core to generate the laser beam. Preferably, the laser beam generated by the ytterbium-based fibre has a wavelength between 1.07 and 1.09 μm, a 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 and mixtures thereof, and, optionally, it further contains one or more additional compounds chosen from O2, CO2, H2 and CH4.
A laser cutting method for cutting a stainless steel workpiece, in which laser beam generation means comprising at least one ytterbium-containing fiber for generating a laser beam are used to melt the workpiece and thereby perform the actual cutting, wherein the quality factor of the laser beam is between 0.33 and 8 mm·mrad and cut by a coated, fused-silica lens having a focal length of between 80 mm and 510 mm.
Dependencies are inferred from the claim text.