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Proceedings Paper

Improvements of the welding performance of plasma arcs by a superimposed fibre laser beam
Author(s): Achim Mahrle; Sascha Rose; Michael Schnick; Thomas Pinder; Eckhard Beyer; Uwe Füssel
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Paper Abstract

Details and results of experimental investigations of a laser-supported plasma arc welding process are presented. The particular feature of the realized experimental set-up is the coaxial arrangement of a single-mode fibre laser beam through a hollow tungsten electrode in combination with a modified plasma welding torch. The analysis of the welding capabilities of the combined laser-arc source comprises high-speed video recordings of the arc shape and size, corresponding simultaneous measurements of the arc voltage as well as an evaluation of the resultant weld seam geometries. Results of welding trials on different types of steel and aluminum alloys are discussed. The corresponding investigations reveal that a fibre laser beam with a wavelength of 1.07 microns can have a crucial impact on the arc and welding characteristics for both categories of materials even at very low laser power output levels. Beneficial effects are especially observed with high welding speeds. In that particular case the arc root and therefore arc column can be substantially stabilized and guided by the laser-induced hot spot.

Paper Details

Date Published: 6 February 2012
PDF: 12 pages
Proc. SPIE 8239, High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications, 82390D (6 February 2012); doi: 10.1117/12.906678
Show Author Affiliations
Achim Mahrle, Technische Univ. Dresden (Germany)
Sascha Rose, Technische Univ. Dresden (Germany)
Michael Schnick, Technische Univ. Dresden (Germany)
Thomas Pinder, Technische Univ. Dresden (Germany)
Eckhard Beyer, Technische Univ. Dresden (Germany)
Fraunhofer IWS Dresden (Germany)
Uwe Füssel, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 8239:
High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications
Eckhard Beyer; Timothy Morris, Editor(s)

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