Hydrodynamisches Lager

The hydrodynamic bearing (1) for a spindle motor, comprises stationary bearing bushes (2), a shaft (6) rotatably arranged coaxial to the bearing bushes, and a bearing gap, which is filled with a bearing fluid, where two parts of the bearing are welded together with a rotary weldseam, a pressure plate with the shaft and/or a hub with the shaft and/or the bearing bushes with a counter-pressure plate (5) and/or the bearing bushes with a base plate. The weld seam is arranged completely in a circumferential groove. The welding connection is helium-tight.; The hydrodynamic bearing (1) for a spindle motor, comprises stationary bearing bushes (2), a shaft (6) rotatably arranged coaxial to the bearing bushes, and a bearing gap, which is filled with a bearing fluid, where two parts of the bearing are welded together with a rotary weldseam, a pressure plate with the shaft and/or a hub with the shaft and/or the bearing bushes with a counter-pressure plate (5) and/or the bearing bushes with a base plate. The weld seam is arranged completely in a circumferential groove. The welding connection is helium-tight and is produced with a wobble-laser-welding process in which the laser beam is moved with a wobble-frequency and wobble- amplitude, where the wobble amplitude plus the beam-width of the laser beam is smaller than the groove width.; A feed rate of the laser is divided by the wobble-frequency less or equal to the wobble-amplitude plus the beam-width so that a continuous weld seam is formed. A wobble-motion is circular. The circular wobble-motion and a feed direction have opposite direction of rotation. The hub is arranged on the front surface of the part to be connected. The part to be connected has a chamfer, a radius, a section (4) or a fillet chosen through which the hub is formed. The bearing bushes are welded with a counter-pressure plate and/or with a base plate. The shaft is welded to the hub. An independent claim is included for a wobble-laser-welding process for welding parts of hydrodynamic bearings.