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Effects of Electromagnetic Stirring on Particle Mixing during GTA Welding of Al-Mg-Si Matrix Composites

In this paper the results are presented of a study dealing with the influence of electromagnetic stirring of the weld pool during GTA welding of the composite 6O6I/AI2O3/IOP. Attention is focussed on the mixing behaviour of the particles when welding with filler material (Al 5wt.% Si). Bead-on-plate welding experiments were carried out under different stirring conditions. After welding, cross-sections were made of each weld and these cross-sections were examined visually and using optical microscopy. The degree of mixing of the particles in the welds obtained was expressed in terms of a mixing parameter. It appears that the best mixing results are obtained with a magnetic induction higher than 20 mT and a stirring frequency of around 2 Hz and that the hardness of the stirred welds (after T6 heat treatment) does not significantly deviate from that of the base material. On the basis of the results obtained it can be concluded that electromagnetic stirring can be successfully applied in the case of welding composite material under practical conditions.