Arrangement for the repair of the blades of BLISK drums by means of laser deposition welding

An arrangement for repairing blades of BLISK drums for gas turbines by laser deposition welding, comprising:

• a laser source and laser optics for generating a focused laser beam;
• a powder line connected to a powder reservoir for supplying a metal powder jet to a weld area to be melted by the laser beam;
• a welding apparatus of modular type, including
• a connection module which is connected to the laser source and in which the entering laser beam is shaped and deflected,
• a camera module connected to one side of the connection module for a CCD camera, and
• a beam-shaping module connected at an opposite side for shaping and focusing the laser beam, and
• a slender welding-head module adjoining the beam-shaping module with the laser beam and the powder line extending in longitudinal direction of said welding-head module and being directed in a deposition head towards a sideward exit port, and
• a protective-gas shielding module adjoining the exit port and being connected to a protective-gas source, forming an open protective-gas duct to protect a metal deposit applied to the blade edge against contamination during melting and cooling.