3D heat transfer model of hybrid laser Nd:Yag-MAG welding of S355 steel and experimental validation

A three-dimensional heat transfer model was developed to predict the temperature fields, the weld geometry and the shape of the solidified weld reinforcement surface during hybrid laser-MAG arc welding of fillet joints. Melt pool deformation due to arc pressure was calculated by minimizing the total...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2011-03, Vol.54 (7-8), p.1313-1322
Main Authors: Le Guen, Emilie, Carin, Muriel, Fabbro, Rémy, Coste, Frédéric, Le Masson, Philippe
Format: Article
Language:English
Subjects:
Applied sciences
Arc pressure
Arc welding
Beads
Droplets
Engineering Sciences
Exact sciences and technology
Heat transfer
Joining, thermal cutting: metallurgical aspects
Laser beam welding
Laser hybrid Nd:Yag
MAG welding
Mathematical models
Mechanics
Metals. Metallurgy
Modeling
Physics
Surface deformation
Surface energy
Thermics
Weld metal pool
Welded joints
Welding
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Summary:A three-dimensional heat transfer model was developed to predict the temperature fields, the weld geometry and the shape of the solidified weld reinforcement surface during hybrid laser-MAG arc welding of fillet joints. Melt pool deformation due to arc pressure was calculated by minimizing the total surface energy. A series of hybrid welding experiments was conducted on S355 steel for different welding speeds and wire feeding rates. A high speed video camera was used to measure weld pool depression and surface weld pool geometry. Visualization of the weld pool during welding has also allowed for a better understanding of the interaction between the keyhole and droplets. The various weld bead shapes were explained through these observations. The arc pressure, the surface energy distribution, and arc efficiency were evaluated by comparing experimental data and numerical results for a wide range of welding operating parameters. Good correlation was found between the calculated and experimental weld bead shapes obtained for the hybrid laser-MAG arc welding process as well as for laser or MAG alone.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2010.12.010