| 1. |
- Choquet, Isabelle, 1965-, et al.
(författare)
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Modeling and simulation of a heat source in electric arc welding
- 2011
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Ingår i: Proceedings from the 4th Swedish Production Symposium, Lund, Sweden. ; , s. 202-211, s. 201-211
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Konferensbidrag (refereegranskat)abstract
- This study focused on the modeling and simulation of a plasma heat source applied toelectric arc welding. The heat source was modeled in three space dimensions couplingthermal fluid mechanics with electromagnetism. Two approaches were considered forcalculating the magnetic field: i) three-dimensional, and ii) axi-symmetric. The anodeand cathode were treated as boundary conditions. The model was implemented in theopen source CFD software OpenFOAM-1.6.x. The electromagnetic part of the solverwas tested against analytic solution for an infinite electric rod. Perfect agreement wasobtained. The complete solver was tested against experimental measurements for GasTungsten Arc Welding (GTAW) with an axi-symmetric configuration. The shielding gaswas argon with thermodynamic and transport properties covering a temperature rangefrom 200 to 30 000 K. The numerical solutions then depend greatly on the approachused for calculating the magnetic field. The axi-symmetric approach indeed neglectsthe radial current density component, mainly resulting in a poor estimation of the arcvelocity. Various boundary conditions were set on the anode and cathode. Theseconditions, difficult to measure and to estimate a priori, significantly affect the plasmaheat source simulation results. Solution of the temperature and electromagnetic fieldsin the electrodes will thus be included in the forthcoming developments.
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| 2. |
- Nilsson, Håkan, 1971, et al.
(författare)
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Implementation of a 3D solver for electric arc welding, coupling fluid mechanics with electromagentics
- 2011
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Ingår i: 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics. HEFAT2011. ; , s. 614-620
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Konferensbidrag (refereegranskat)abstract
- This paper describes the implementation of a 3D numerical solver for electric arc welding, where the fluid mechanics of the shielding gas is strongly influenced by the electromagnetic fields. The implementation is done in the OpenFOAM-1.6.x OpenSource Computational Fluid Dynamics (CFD) tool (www.openfoam.com). OpenFOAM is basically a general library of C++ classes for numerical simulation of continuum mechanic problems, but it is mainly used in CFD. The basics of high-level programming in OpenFOAM is described briefly, while the main components of the implementation done in the present work are described in high detail. The implementation is validated against an analytical solution of the electromagnetic field of an infinite electrically conducting rod, and against an experimental study of GTAW (Gas Tungsten Arc Welding). The numerical results agree very well with both the analytical and experimental results. A grid-dependency study has been made for the GTAW case, showing that the main features of the presented solutions are independent of the mesh size.
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| 3. |
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| 4. |
- Sass-Tisovskaya, Margarita, 1979
(författare)
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Plasma Arc Welding Simulation with OpenFOAM
- 2009
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- A simulation tool that is valid within the field of tandem arc welding(unsteady, three dimensional thermal plasma flow) has been developed,based on the open source CFD package OpenFOAM. The validation of the electromagnetic part of the solver has been done separately using a problem with a known solution. A good agreement between the numerical and analytical solutions was obtained. Different boundary conditions on the magnetic potential vector have been tested. Based on these tests, the appropriate boundary conditions were chosen for the case representing a transferred arc configuration. The complete simulation tool was validated using a tungsten inert gas single arc problem. Two representations of the magnetic field have been tested, based on the electric and magnetic potentials, respectively. Qualitatively, both approaches agreed well with the results found in the literature. However, quantitatively a deviation in the results was observed in the near cathode region.
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