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Influence on the dilution by laser welding of aluminum with magnetic stirring

By Z. Tang and M. Gatzen


AbstractThe Aluminum 6xxx alloys are well-known for their high susceptibility to hot cracking. It has been reported that this problem can be effectively resolved by introducing silicon into the molten pool. However, the high welding speed by laser welding process results in an inhomogeneous dilution of the silicon, which may lead to hot cracks in the Sipoor area. The idea of applying a low frequency magnetic field during laser welding process has been already carried out recently in order to make a stir effect inside the molten pool and therefore to improve the element dilution in the weld joint.In this paper, the effects of the magnetic field on the melt flow as well as the element dilution are shown by applying copper as “tracer” inside the molten pool. Several methods were designed with different forms of copper at different positions in the workpieces to visualize the melt flow and the corresponding element dilution in different areas of the molten pool. In addition, laser welding with AlSi18 filler wire was also conducted to realize a real welding process comparing to that with “tracer”. WDX analysis was then carried out to investigate how silicon distributed inside the welds with the help of magnetic stirring. The results demonstrate that a DC magnetic field, with its direction coaxial to the laser, tends to modify the melt flow dynamics at flux density up to 100 mT. The results of laser welding with filler wire showed that by the help of an AC magnetic field with a frequency up to 10 Hz and flux density above 100 mT, the element dilution could be improved in the weld joint. The WDX analysis showed that under the influence of an alternating magnetic field a periodicity of the silicon distribution can be achieved, which depends greatly on the magnetic frequency

Publisher: Published by Elsevier B.V.
Year: 2010
DOI identifier: 10.1016/j.phpro.2010.08.037
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