Patent ID: 8809730

Claim:
A modular system for overlay welding at inwardly disposed surfaces of workpieces comprising a laser beam, a feed for powdery welding material as well as a respective feed for protective gas and for a coolant, characterized in that the system is formed with a coupling module ( 2 ) for the laser beam ( 1 ), at least one beam guiding module ( 5 ) for the laser beam ( 1 ) and with a processing module ( 6 ), which can be connected to one another, wherein a collimated laser beam ( 1 ) is directed via the coupling module ( 2 ) through the beam guiding module(s) ( 5 ) onto an optical element ( 4 ) focusing the laser beam ( 1 ) onto the surface of a workpiece to be processed and a nozzle ( 7 ) is present at the processing module ( 6 ) and has a discharge opening ( 7 . 1 ) for the laser beam ( 1 ) and the protective gas and at least one passage ( 7 . 4 ) is present having a discharge opening for powdery welding material.