This paper presents a three-dimensional finite element model of the heat flow during tandem pulsed laser welding. Model predictions of fusion zone and heat-affected zone dimensions are compared with experimental measurements. When two beams from the same laser are used in tandem to weld a material, it is the intensity distribution of the composite processing beam which is important. This is similar to being able to select the mode of the laser beam, as the relative intensities, spacing and spot size of the two beams can be varied. The potential benefits such a scheme may produce over single beam laser processing are: the possibility of removing potential contaminants to the weld with a minor beam ahead of the main welding beam; the ability to control the heating and cooling rates of the workpiece by employing a minor beam to effectively preheat or postheat the weld; and the modification of the speed and penetration characteristics of single beam laser welding with the same total power. Experiments using a pulsed Nd:YAG laser to produce bead-on-plate welds in AISI 1006 steel were performed to compare with theory. The results suggest that the cooling rates associated with single beam laser welding can be reduced by introducing a minor preheat beam.
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International Congress on Applications of Lasers & Electro-Optics
October 14–18, 2018
Orlando, FL, USA
ISBN:
978-0-912035-55-0
PROCEEDINGS PAPER
Numerical and experimental investigation of tandem pulsed Nd:YAG laser welding
Michael Frewin;
Michael Frewin
*
Department of Materials Engineering, University of Wollongong
Northfields Avenue, Wollongong, NSW, Australia
, 2522
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Druce Dunne;
Druce Dunne
*
Department of Materials Engineering, University of Wollongong
Northfields Avenue, Wollongong, NSW, Australia
, 2522
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Andrew Scott
Andrew Scott
**
Industrial Laser Centre, CSIRO Division of Manufacturing Technology
P.O. Box 218, Lindfield, NSW, Australia
, 2070
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Published Online:
October 01 1996
Citation
Michael Frewin, Druce Dunne, Andrew Scott; October 14–18, 2018. "Numerical and experimental investigation of tandem pulsed Nd:YAG laser welding." Proceedings of the International Congress on Applications of Lasers & Electro-Optics. ICALEO® ‘96: Proceedings of the Lasers and Electro-Optics for Automotive Manufacturing Conference. Orlando, FL, USA. (pp. pp. B214-B223). ASME. https://doi.org/10.2351/1.5059022
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