Modular system for welding on inner surfaces of workpieces with a laser beam

The invention relates to a modular system for welding on inner surfaces of workpieces with a laser beam. It can be formed on inner surfaces with powdered filler material a coating. The object of the invention is to provide opportunities for the cladding or coating of internal surfaces of workpieces with variable immersion depth, increased flexibility and independence direction during machining. a supply for powdery filler material and in each case a supply of protective gas, and a coolant are provided at an inventive system. It is formed with a Einkoppelmodul for the laser beam, at least one beam guidance module for the laser beam, and a processing module which can be connected to each other. In this case, a collimated laser beam across the Einkoppelmodul by the / the beam guidance module (s) is directed to a laser beam on the surface to be machined of a workpiece focusing optical element. At processing module, a nozzle with an outlet opening for the laser beam and the inert gas and at least one channel with outlet opening for powdered filler material are provided.