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Proceedings Paper

Laser-induced plasma as a source for an intensive current to produce electromagnetic forces in the weld pool
Author(s): Günter Ambrosy; Vjaceslav Avilov; Peter Berger; Helmuth Hügel
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Paper Abstract

Laser beam welding performed with a CO2 laser by applying a magnetic field perpendicular to the welding direction influences the weld pool dynamics, which changes the seam properties significantly. From these results it was concluded that an intensive current density must exist in the melt. In repeating those welding experiments with a Nd:YAG laser, however, no significant effects could be observed. To explain this discrepancy, detailed trials with both CO2 and Nd:YAG lasers were carried out and led to an explanation which is presented in this paper. Looking at the welding process with radiation of 10.6 &mgr;m and 1.06 &mgr;m, the only significant difference is the presence of a laser-induced plasma plume above the workpiece in the case of the longer wavelength. Therefore, the investigations were concentrated on its possible role in establishing a current flow through the weld pool. This current was directly measured during the welding process (bead on plate): Two aluminum plates separated by an insulated gap of 0.85 mm were moved under the focused beam (3 kW; 5 m/min) and the signal was recorded as function of the gap's position. From these measurements were deduced values of current that amounted to approximately 0.3 A with CO2 and more then one order of magnitude less with Nd:YAG lasers.

Paper Details

Date Published: 26 April 2007
PDF: 8 pages
Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63461Q (26 April 2007); doi: 10.1117/12.738838
Show Author Affiliations
Günter Ambrosy, Univ. Stuttgart (Germany)
Vjaceslav Avilov, Univ. Stuttgart (Germany)
Peter Berger, Univ. Stuttgart (Germany)
Helmuth Hügel, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 6346:
XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Dieter Schuöcker, Editor(s)

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