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Proceedings Paper

Numerical and experimental evaluation of Nd:YAG laser welding efficiency in AZ31 magnesium alloy butt joints
Author(s): Leonardo Daniele Scintilla; Luigi Tricarico
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Paper Abstract

In this paper, energy aspects related to the efficiency of laser welding process using a 2 kW Nd:YAG laser were investigated and reported. AZ31B magnesium alloy sheets 3.3 mm thick were butt-welded without filler using Helium and Argon as shielding gases. A three-dimensional and semi-stationary finite element model was developed to evaluate the effect of laser power and welding speed on the absorption coefficient, the melting and welding efficiencies. The modeled volumetric heat source took into account a scale factor, and the shape factors given by the attenuation of the beam within the workpiece and the beam intensity distribution. The numerical model was calibrated using experimental data on the basis of morphological parameters of the weld bead. Results revealed a good correspondence between experiment and simulation analysis of the energy aspects of welding. Considering results of mechanical characterization of butt joints previously obtained, the optimization of welding condition in terms of mechanical properties and energy parameters was performed. The best condition is represented by the lower laser power and higher welding speed that corresponds to the lower heat input given to the joint.

Paper Details

Date Published: 22 February 2013
PDF: 12 pages
Proc. SPIE 8603, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II, 86030O (22 February 2013); doi: 10.1117/12.2004940
Show Author Affiliations
Leonardo Daniele Scintilla, Politecnico di Bari (Italy)
Luigi Tricarico, Politecnico di Bari (Italy)

Published in SPIE Proceedings Vol. 8603:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II
Friedhelm Dorsch, Editor(s)

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