Abstract
The radiation of a CO2-laser is highly reflected at metallic surfaces. A plasma, generated by a TEA-CO2-laser, can be used to increase the absorption of a cw-CO2-laser during laser beam transformation hardening without any harmful melting of the surface. An increased case depth can be achieved during laser beam transformation hardening of a heat treatable steel without preoxidizing of the metal surface or using additional coatings. The radiation of a 18 kW cw-CO2-laser was formed by a facetted mirror and superimposed by a TEA-CO2-laser pulse with an energy of 6 J. The induced plasma interacts and modifies the surface of the heat treatable steel resulting in a higher absorption of the 18 kW cw-CO2-laser radiation. A linear polarized beam irradiated under the Brewster angle shows an enhanced absorption. Superimposing a TEA-CO2-laser pulse with an energy of 180 mJ to a linear polarized 4 kW CO2-laser beam irradiated under an angle of 70° an even increased case depth can be observed.
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References
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© 1994 Springer-Verlag Berlin Heidelberg
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Jaschek, R., Bergmann, H.W. (1994). Laser Beam Material Processing Using a Combination of a High Power CW-CO2-Laser and a TEA-CO2-Laser. In: Waidelich, W. (eds) Laser in der Technik / Laser in Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08251-5_102
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DOI: https://doi.org/10.1007/978-3-662-08251-5_102
Publisher Name: Springer, Berlin, Heidelberg
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