Patent ID: 7211166

Claim:
A method for joining two workpieces made from plastic, comprising providing a laser source for emitting a laser beam, providing an upper workpiece, comprising a material transparent to the laser beam, providing a lower workpiece, comprising a material absorbent to the laser beam, wherein mutually bordering contact surfaces for the two workpieces are melted under the effect of the laser beam and joined to one another under pressure and subsequent cooling, providing a machining head having a rotatably mounted transparent pressure element and pressing the transparent pressure element onto the upper workpiece showing a three-dimensional shaped touch surface for the transparent pressure element facing the machining head wherein a mechanical compression of the workpieces by the transparent pressure element and a guiding of the laser beam are accomplished simultaneously with a three-dimensional motion of the machining head and a dosage of the compression being exerted to the upper workpiece by the machining head.