Ingenieurwissenschaften und zugeordnete Tätigkeiten
Filtern
Erscheinungsjahr
- 2018 (11) (entfernen)
Dokumenttyp
- Zeitschriftenartikel (5)
- Vortrag (5)
- Beitrag zu einem Tagungsband (1)
Sprache
- Englisch (11)
Schlagworte
- Laser beam welding (4)
- Numerical modelling (3)
- Solidification cracking (3)
- High power laser beam welding (2)
- Laser metal deposition (2)
- Multiple reflections (2)
- Numerical simulation (2)
- Process simulation (2)
- Pulsed laser beam welding (2)
- Transient heat transfer (2)
- Vaporization (2)
- Weld pool dynamics (2)
- Beam oscillation (1)
- Beam oscillations (1)
- Boundary element method (1)
- Bulging (1)
- Bulging effect (1)
- CFD model (1)
- CFD-model (1)
- Computational fluid dynamics (1)
- Deformed geometry (1)
- Equivalent heat source (1)
- Equivalent volumetric heat source (1)
- FE-model (1)
- Finite element method (FEM) (1)
- Full penetration (1)
- Keyhole welding (1)
- Moving mesh (1)
- Numerical process simulation (1)
- Thermal cycles (1)
- Weld pool (1)
- Weld pool geometry (1)
- Weld pool shape (1)
Organisationseinheit der BAM
- 9 Komponentensicherheit (11) (entfernen)
Eingeladener Vortrag
- nein (5)
This work aims to find the thermal cycles during and after fusion welding through simulation by first calculating the resulting local temperature field in the quasi-stationary part of the process. Here complete-penetration keyhole laser beam welding with a laser power of 18 kW on a 15 mm thick slab of a low-alloyed steel at a welding speed of 2 m/min is considered. In order to physically depict the laser material interaction a multi-physics numerical model including the effects of phase transformation, thermo-capillary convection, natural convection and temperature-dependent material properties up to evaporation temperature is developed.
It uses a fixed keyhole geometry with a right truncated circular cone shape to introduce the laser beam energy to the workpiece. In a subsequent study, the resulting local temperature field is then used as an equivalent heat source in order to predict the unsteady thermal cycle during and after fusion welding. The translational movement of the laser beam through the workpiece is represented by a moving mesh approach. For the simulation, stationary heat transfer and fluid dynamics are described by a system of strongly coupled partial
differential equations. These are solved with the commercial finite element software COMSOL Multiphysics 5.0. The results of the numerical simulation are validated by experiments, where the weld bead shapes and the thermal cycles show good correlation.