Product Code: ICA10_806

Increasing the Deposition Rate of Inconel 718 for Lmd
Authors:
Johannes Witzel, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
Ingomar Kelbassa, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
Andres Gasser, Fraunhofer Institut Fuer Lasertechnik; Aachen
Gerhard Backes, Chair for Laser Institute, RWTH Aachen University; -
Presented at ICALEO 2010

Laser Metal Deposition (LMD) has great benefits when applying repair strategies on components of high complexibility such as turbine blades or blade integrated disks (BLISK). Due to limited deposition rate of material on substrate, process time for LMD increases which is a main factor for high production costs. Thus a significant increase of deposition rate (factor 6 to 10) is of interest when using LMD for repair, even more for a complete generation, of large volume components. Goal of the current study is the qualification of LMD as a production and repair process for high speed generation and regeneration of turbine blades and Blisks made of IN 718 using conventional manufactured disks as substrate. In a first step studies on parameter combinations for a higher deposition rate are carried out using a 10 KW disk laser. Two strategies are currently examined when building single blades. A co-axial powered feeding nozzle assembled to a zoom-optic guarantees near net shape generation while a lateral square-shaped powered feeding nozzle together with square shaped laser beam geometry provides higher deposition rates. In a second step, a LMD of a blade model is carried out using a variation of the laser beam diameter during process.