Modeling of weld pool phenomena in tungsten inert gas, CO2-laser and hybrid (TIG+CO2-laser) welding
| Autor: | Alexander Zabirov, I. V. Krivtsun, Oleksii Semenov, Uwe Reisgen |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Heat-affected zone Materials science Gas tungsten arc welding Shielding gas Biomedical Engineering Laser beam welding 02 engineering and technology Welding 021001 nanoscience & nanotechnology Electric resistance welding Mathematics::Geometric Topology 01 natural sciences Atomic and Molecular Physics and Optics Statistics::Computation Electronic Optical and Magnetic Materials law.invention law 0103 physical sciences Weld pool Physics::Accelerator Physics Arc welding Composite material 0210 nano-technology Instrumentation |
| Zdroj: | Journal of Laser Applications. 28:022406 |
| ISSN: | 1938-1387 1042-346X |
| Popis: | The efficiency of the welding process in terms of weld penetration and weld width is greatly determined by the heat, mass, and charge transfer phenomena in the weld pool. These phenomena, in turn, depend on the thermal and electromagnetic interaction of the heat source used with the metal being welded. The most adequate models of the welding processes should consider the interaction of the phenomena in the heat source, on the base metal surface and inside its volume by a self-consistent way. This paper is devoted to the development of a self-consistent model of weld pool dynamics in tungsten inert gas (TIG), laser and hybrid (laser + TIG) spot welding without a keyhole formation. The proposed model allows simulation of processes taking place in the weld pool and on its surface. The model takes into account free surface deformation, influence of plasma shear stress, thermocapillary Marangoni effect, and Lorentz forces on the weld pool, as well as of the processes in the arc plasma including laser-arc interaction. For this purpose, the model of the weld pool is combined with a model of arc plasma column where the interaction processes between Gaussian beam radiation emitted by a continuous-wave CO2 laser and the argon arc plasma are described. The equations of the model proposed are solved numerically by means of finite element method. The simulation results are compared with real welding experiments performed with steel S-235JR. A good accordance between simulation and experimental results is observed. |
| Databáze: | OpenAIRE |
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