Gas mixture for laser beam welding at powers up to 12 kW of steel and stainless steel containing helium, nitrogen and oxygen

摘要

Gas mixture for laser beam welding up to 12 kW contains 10 to 80 % by volume of helium with the remainder being nitrogen and oxygen. The volumetric ratio of nitrogen to oxygen is between 95/5 and 80/20. Preferentially the gas mixture may be formed from 10 to 70 % of helium with the remainder being air. Independent claims are also included for: (a) a method for the welding of steel or stainless steel components by laser beam using this gas mixture; (b) a method for the production of the gas mixture.