Device for transmission welding of internal peripheral surfaces of a workpiece by means of laser radiation

摘要

The apparatus comprises a unit of laser beam including laser optics modules (4), and a receptacle (2) for a workpiece with axially symmetrical inner circumferential surfaces. Each of the laser optics modules includes a high power laser diode, a beam shaping optical arranged on a circular line at equal distances to each other, and a rotationally symmetrical deflecting lens. The high power diode laser emits divergent laser beam has a beam axis in a radiation plane radially to a center of the circular line. The symmetrical deflecting lens is arranged perpendicular to the radiation plane. The apparatus comprises a unit of laser beam including laser optics modules (4), and a receptacle (2) for a workpiece with axially symmetrical inner circumferential surfaces. Each of the laser optics modules includes a high power laser diode, a beam shaping optical arranged on a circular line at equal distances to each other, and a rotationally symmetrical deflecting lens. The high power diode laser emits divergent laser beam having a beam axis in a radiation plane radially to a center of the circular line. The rotationally symmetrical deflecting lens is arranged perpendicular to the radiation plane. An axis of symmetry of the surface of the workpiece is coaxially arranged to a body axis of the deflecting lens. The deflecting lens is a conical mirror element (3), which has a cone angle of less than 2-10[deg] so that an incident laser beam is directly reflected in a welding plane including a welding distance to the radiation plane on the inner circumferential surfaces of the received workpiece in the receptacle. The conical mirror element is configured for influencing the beam expander of the laser beams, is adjusted perpendicularly to the radiation plane, and has a concave-shaped reflective surface.