مقاله جوشکاری با عنوان : Effect of electromagnetic stirring on the microstructures and mechanical properties of magnesium alloy resistance spot weld

Q. Yao, Z. Luo ⇑, Y. Li, F.Y. Yan, R. Duan

چکیده :

This paper investigates the effect of electromagnetic stirring (EMS) on the nugget formation, microstructure,
and mechanical properties of magnesium alloy resistance spot weld (RSW). The EMS was induced by
an external magnetic field (EMF), which produced by a pair of permanent magnets. The results showed
that the EMS drove the molten metal in the nugget to flow clockwise and generated a centrifugal movement,
which brought high temperature molten metal from the center of the growing nugget to its edge.
Compared with the traditional magnesium alloy RSW, the weld under the EMS effect (EMS-RSW) exhibited
larger weld diameter, higher tensile shear force and energy absorption, and finer equiaxed crystal
and columnar crystal. The EMS-RSW had a higher hardness ratio of fusion zone to pullout failure location,
which indicated that the EMS-RSW was more sensitivity to experience pullout failure. Finally, an empirical
failure load formula for magnesium alloy resistance spot weld was developed.