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Proceedings Paper

New method for process monitoring in high-power simultaneous laser beam welding
Author(s): Bernd Seidel; Christian Koerber; Klaus Behler; Eckhard Beyer
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Paper Abstract

Simultaneous laser beam welding is a modified procedure of both sided laser beam welding. Two laser beams are focused in opposite direction at the same time and place onto the workpiece. The process is characterized by the formation of a joint keyhole opened to both sides of the workpiece. The main advantages in comparison with conventional laser welding processes are higher welding speed, avoidance of angular distortion due to a symmetrical field of thermal stresses, as well as minimum porosity, especially in the middle of the seam volume, and a high degree of process stability. The advantages are depending on the joint keyhole. In the case of small adjustment of the two beam axes combined with inappropriate parameter settings this joint keyhole can collapse into two separated keyholes each having only an opening to one side of the workpiece. Therefore the process state with 'joint keyhole' has to be monitored. According to this criterion a non-destructive on- line measurement technique has been developed. The measurement technique is based on RF-frequency modulation of one of the two applied laser beams. Since the results of the measurement are available in very short time scales a usage for on-line control is possible.

Paper Details

Date Published: 23 September 1996
PDF: 10 pages
Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); doi: 10.1117/12.251196
Show Author Affiliations
Bernd Seidel, Fraunhofer-Institut fuer Lasertechnik (Germany)
Christian Koerber, Fraunhofer-Institut fuer Lasertechnik (Germany)
Klaus Behler, Fraunhofer-Institut fuer Lasertechnik (Germany)
Eckhard Beyer, Fraunhofer-Institut fuer Lasertechnik (Germany)

Published in SPIE Proceedings Vol. 2789:
High-Power Lasers: Applications and Emerging Applications
Georges Sayegh; Michael R. Osborne, Editor(s)

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