Abstract: A gassing reactor is provided that comprises a dispersion stage with a rotor and a stator. The rotor and the stator respectively exhibit at least one shear surface that exhibits at least one axial component in relation to the axis of rotation of the dispersion stage. It is further provided that the gassing reactor exhibits at least one gas feed line that opens into at least one gas outlet opening into a dispersion gap of the dispersion stage formed between the rotor and the stator, delimited by the shear surfaces. In this way, the gas introduction into the liquid can be done within a range in which the maximum shear forces and highly-turbulent shear fields occurs when the gassing reactor is operating and rotor is rotating. This promotes a reliable as a fine-beaded as possible dissipation of the gas into the liquid.

Abstract: A process for welding work pieces (10) with a laser beam that is focused n the work pieces (10) that are moved relative to it, and causes vaporization of the material, such that apart from the laser beam (11), an arc (12) is used in the area of the work pieces (10) that is struck by the laser beam. In order to improve the welding result, the process is undertaken in such a way that a work piece (10) with a laser-formed surface pathway that is free of dielectric substances, which pathway guides the arc (12) within a dielectric layer (15) that completely covers the remainder of the area of the weld (14), is used.

Abstract: A welding process in which laser radiation is trained on the seam area fod between two sheet-metal workpieces, one of which has an edge projecting above the other. In addition, the arc is guided along this edge to melt the edge and contribute molten metal to the pool formed by the laser.