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Proceedings Paper

CO laser deep-penetration welding: a comparative study to CO2 laser welding
Author(s): Martin Schellhorn; Hartwig von Buelow
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Paper Abstract

An unstable resonator (M equals 2) has been applied to reduce the beam divergence of a gasdynamically cooled supersonic CO laser operating at 105 K in a semiclosed gas cycle. A 4.7 kW laser beam with a total divergence of 2.5 mrad is obtained with an efficiency of 9.4%. The results of welding experiments are compared with those using a CO2 laser. The weld depth obtained with the CO2 laser are drastically reduced using Argon as assist gas; whereas the results with the CO laser are independent of the assist gas because of the lower plasma absorption coefficient for the shorter CO laser wavelength. The beam quality of the CO laser is strongly influenced by water vapor absorption in the beam delivery system.

Paper Details

Date Published: 31 March 1995
PDF: 6 pages
Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); doi: 10.1117/12.204988
Show Author Affiliations
Martin Schellhorn, Deutsch-Franzoesisches Forschungsinstitut (France)
Hartwig von Buelow, DLR (Germany)

Published in SPIE Proceedings Vol. 2502:
Gas Flow and Chemical Lasers: Tenth International Symposium
Willy L. Bohn; Helmut Huegel, Editor(s)

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