Abstract
Today laser alloying/dispersing of Aluminum is a well-known technique to increase the wear resistance of parts. The alloyed/dispersed layer is typically limited in depth to about 1–1.5 mm. For Aluminum the absorptivity of near infrared wavelengths is comparably low. This makes conventional laser alloying/dispersing inefficient. In contrast, the overall absorption of the laser power using the deep penetration effect is comparatively high. The comparison of the principles of the conventional laser alloying process and the deep penetration alloying process is shown in this study. In deep penetration alloying, the track geometry and the distribution of the filler material can both be influenced by the process parameters. It is shown that a deeper alloying is possible by using the deep penetration effect caused by a highly intensive laser beam. The laser beam is scanned in a circular or other motion in order to control the shape of the track. By this manner of alloying it is possible to realize nearly rectangular and comparable deep track geometries. The dependencies of the penetration depth on the process parameters will show a way how to compromise between the optimal distribution of the filler material and the geometry of the track in order to optimize the whole process.
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Acknowledgments
The authors like to thank the “Deutsche Forschungsgemeinschaft DFG” for financing of the research project Ha 5257/1.
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Vollertsen, F., Partes, K., Habedank, G. et al. Deep penetration dispersing of aluminum with TiB2 using a single mode fiber laser. Prod. Eng. Res. Devel. 2, 27–32 (2008). https://doi.org/10.1007/s11740-008-0080-x
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DOI: https://doi.org/10.1007/s11740-008-0080-x