Fluid Flow Simulation of the Influence of a Steady Magnetic Field on the Weld Pool Dynamics in Deep Penetration Laser Beam Welding of Aluminum
A multi-physics numerical model was developed to investigate the influence of a steady magnetic field during partial penetration keyhole laser beam welding of an aluminum plate in flat position.Three-dimensional heat transfer,fluid dynamics including phase transition and electromagnetic field partial differential equations were solved with the finite element differential equation solver COMSOL Multiphysics.The magnetic field was aligned perpendicularly to the welding direction.The main objective of these simulations was to estimate the critical value of the magnetic field needed to suppress convective flows in the weld pool during high-power(up to 20 kW)laser beam welding of aluminum alloys with up to 20 mm deep weld pool.It reveals that steady magnetic fields with corresponding Hartmann numbers Ha2~104 based on the half-width of the weld pool can effectively suppress convective flows in the weld pool.Moreover,the typically occurring wineglass-shape of the weld cross section caused by thermo-capillary flow is weakened.
laser beam welding Lorentz force Marangoni stresses natural convection Hartmann effect
BACHMANN Marcel AVILOV Vjaceslav GUMENYUK Andrey RETHMEIER Michael
BAM Federal Institute for Materials Research and Testing,Unter den Eichen 87,12205,Berlin,Germany
国际会议
The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)
北京
英文
1-5
2012-10-22（万方平台首次上网日期，不代表论文的发表时间）