Plasma or TIG welding or cutting process with a non-oxidizing gas having a low H2O and/or O2 impurity content

摘要

The invention relates, on the one hand, to an electric-arc work process, such as a plasma cutting or TIG welding process, in which a torch is supplied with at least one non-oxidizing gas, the said torch being provided with at least one electrode made of pure or alloyed metal, such as a tungsten electrode, characterized in that the said non-oxidizing gas contains a concentration of impurities of the oxygen type [O2] of less than 80 ppmv and a concentration of impurities of the water vapor type [H2O] of less than 400 ppmv and, on the other hand, to such a welding gas.