Abstract: Laser joining method for connecting different workpieces by the transmission welding method. The laser beam is formed in such a way that the energy density of the laser radiation along the direction of propagation is dependent on the distance from the laser source. A beam constriction in which the maximum energy density is located is produced. A contact surface between the workpieces is arranged in such a way that it is located in the region of high energy density. The plastics material outside the zone of the beam constriction is not effectively heated. The method permits the mass production of welded structured workpieces.