Powder based laser material deposition on edges
Powder based laser material deposition (LMD) is a suitable additive manufacturing technology for repair and overhaul of metal parts as well as for the build-up of new parts. This technology is used in industrial applications as automotive, turbomachinery, aviation, or tool making [T. Jambor, “Funkti...
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Veröffentlicht in: | Journal of laser applications 2020-08, Vol.32 (3) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Powder based laser material deposition (LMD) is a suitable additive manufacturing technology for repair and overhaul of metal parts as well as for the build-up of new parts. This technology is used in industrial applications as automotive, turbomachinery, aviation, or tool making [T. Jambor, “Funktionalisierung von Bauteiloberflächen durch Mikro-Laserauftrag-schweißen,” Ph.D. thesis, RWTH Aachen University, Germany, 2012; I. Kelbassa, “Qualifizieren des Laserstrahl-Auftragschweißens von BLISKs aus Nickel- und Titanbasislegierungen,” Ph.D. thesis, RWTH Aachen University, Germany, 2006; J. Witzel, “Qualifizierung des Laserstrahl-Auftragschweißens zur generativen Fertigung von Luftfahrtkomponenten,” Ph.D. thesis, RWTH Aachen University, Germany, 2014; R. Poprawe, Tailored Light 2 (Springer, Berlin, 2011), pp. 209–224]. The repair of turbine blade tips, for example, requires dimensional accuracy of the deposited volume to achieve sufficient overhang necessary for postweld machining and simultaneously reduces the time and efforts for machining to a minimum. Typically, the repair of a turbine blade tip is carried out layer by layer, and each layer starts with the deposition of a contour track. This contour track is important for outer geometry and therefore for the dimensional accuracy of the volume to be deposited. In order to determine the influence of the contour track on deposit geometry, a basic research in laser material deposition on edges of plates is carried out. During the research presented in this paper, the geometries of single tracks and webs deposited on edges are investigated depending on the distance of the track to the edge of the plate, on the lateral offset of the tracks of two successive layers, and the number of overlapping tracks in one layer. The melt pools are monitored by high-speed videography to analyze melt pool geometry and the characteristics of the powder grain trajectories of the filler metal. In the future, the results of this research will be used to validate a simulation tool that has been developed to simulate LMD on edges with the aim to reduce the number of experimental studies. |
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ISSN: | 1042-346X 1938-1387 |
DOI: | 10.2351/7.0000095 |