Simultaneous circumference 

The ring-shaped laser beam from the ring optics is reflected inwards by a conical mirror, so that it hits the cylindrical parts outside to inside from any direction.
The parts only have to be inserted from below into the conical mirror of the radial optics at the correct height and welded in single laser shot.

Like circumferential welding in contour process by rotation, no external clamping unit is possible. A press fit must be designed between the two parts to be welded.