Method and installation for laser welding with a mixture of N2 / he, and the content of N2 / he is controlled according to the power of the laser.

摘要

Method and installation for laser welding with a mixture of N2 / he, and the content of N2 / he is controlled according to the power of the laser. The invention relates to a method and installation for laser welding which makes even a mixture of protective gas which contains nitrogen and helium.According to the invention, the proportion of nitrogen and / or helium in the gas mixture is selected or adjusted according to the power or power density of the laser beam.The power of the laser is included between 0, 5 kW and 30 kW, and preferably between 5 kW and 20 kW.The gas mixture protector comprises nitrogen and / or helium and, preferably, the gas mixture contains a proportion of volume between 30% and 80%, and the rest is nitrogen and, possibly,The unavoidable impurities.