Mechanism and Microstructure of Oxide Fluxes for Gas Tungsten Arc Welding of Magnesium Alloy

摘要: Five single oxide fluxes—MgO, CaO, TiO2, MnO2, and Cr2O3—were used to investigate the effect of active flux on depth/width ratio in AZ31B magnesium alloy. The microstructure mechanical property tungsten inert gas (TIG) welding seam were studied. oxygen content weld arc images during TIG process analyzed. A series emission spectroscopy for with without developed. results showed that five fluxes, all can increase penetration effectively grain size alternating current (ACTIG) Mg welds made is not very different from those produced fluxes considering trapped oxide. However, have best a relatively higher among flux. It was found only enlarged form flux; constriction observed. detection metal elements oxides exist as neutral atom or first cation arc. This finding would influence properties. When simulation carried out plate applied one side, image video an asymmetric arc, which deviated toward free side. thermal stability, dissociation energy, electrical conductivity should be considered when studying mechanism increased penetration.