| 摘要 |
<p>The invention relates to a method and an apparatus for welding workpieces by means of a focused laser beam, at least one auxiliary gas jet and, if applicable, a working-gas jet. The laser beam and, if applicable, the working gas are guided in parallel onto the workpieces through a nozzle channel (1) arranged centrally in a laser welding nozzle, while the auxiliary gas flows through one or more additional channels (2) of the same laser welding nozzle. Advantageously, the auxiliary gas leaves the laser welding nozzle at a higher exit speed than the working gas. The auxiliary gas is guided onto the workpieces, but not directly onto the weld to be processed, the auxiliary gas having, in addition to a speed component in the direction of the laser radiation, a speed component which is directed tangentially to the central opening in the laser welding nozzle for the laser beam and the working gas. The auxiliary gas is guided towards the workpiece surface via a plurality of additional channels (2) at an angle between 10@ and 80@, it being fed into the additional channels via an annular channel (3). The laser welding nozzle has rotational symmetry, but not axial symmetry, with reference to the additional channels (2). <IMAGE></p> |
