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Proceedings Paper

Plasma Absorption Effects In Welding With CO[sub]2[/sub] Lasers
Author(s): E. Beyer; K. Behler; G. Herziger
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Paper Abstract

The laser-induced plasma which is essential for the laser welding process absorbs a fractional part of the beam power above the workpiece as well as inside the "keyhole". The absorption above the surface of the workpiece always reduces the welding efficiency. It is demonstrated at which processing parameters this absorption takes place and how it can be reduced by shielding gases. Inside the keyhole, different absorption mechanisms could take place. 1st: Fresnel-absorption at the keyhole walls is the substantial absorption mechanism. In this case the direction of the beam polarization shows a strong effect on the welding result. The absorption length of the laser induced plasma Labs is well above the welding depth d (Labs >> d) 2nd: Plasma absorption inside the keyhole takes place. In this case, the welding depth is a function of the plasma absorption length. These absorption mechanisms are described and examples are shown.

Paper Details

Date Published: 24 March 1989
PDF: 12 pages
Proc. SPIE 1020, High Power CO2 Laser Systems and Applications, (24 March 1989); doi: 10.1117/12.950052
Show Author Affiliations
E. Beyer, Fraunhofer-Institut fur Lasertechnik (FRG)
K. Behler, Fraunhofer-Institut fur Lasertechnik (FRG)
G. Herziger, Fraunhofer-Institut fur Lasertechnik (FRG)

Published in SPIE Proceedings Vol. 1020:
High Power CO2 Laser Systems and Applications
A. Quenzer, Editor(s)

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