The present invention relates to an apparatus for irradiating a laser beam to combine workpieces 8, wherein two or more parts are joined by a welding seam along a predetermined connecting line during the joining of the workpieces, The apparatus comprises a workpiece carrier (5) movable along a guiding path (6) for grasping, transporting, arranging and operating the workpieces (8); Means for generating a laser beam; and means for coupling the components by means of coupling means (15, 15 ') for focusing the laser beam onto the workpiece surface, the laser head (13) stationary in the device A welding station (16) comprising a welding station (14) and a blank holder (10, 10 ') which can be arranged on the workpiece surface, said work carrier (5) At least two respective different engaging means (15, 15 ') matched to the individual workpiece dimensions for machining said workpieces (8, 8') having different dimensions, The holders 10, 10 'are provided and, optionally, the engaging means and the blank holders can be automatically inserted automatically.
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