Science and Technology of Welding & Joining · 2012 · 31 citations · 21 references
Natural SciencesMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsMetallic MaterialsMetallurgyAlloysMetalsWeldingWelding ProcessesCracksMagnesium Alloy WeldingMagnesium AlloysMicrostructure Evolution In WeldsTensile StrengthUltimate Tensile StrengthWeld PenetrationWelded Joints
The effects of mix activated fluxes on the penetrations, microstructures and mechanical properties of tungsten inert gas (TIG) welded AZ31 magnesium alloy joints were studied. The results showed that an increase in the amount of TiO 2 coating improved the weld penetration and depth/width ratio of the TIG welded AZ31 magnesium alloy seams. The α-Mg grains of the fusion zone (FZ) became fine gradually with the addition of CaF 2 coating but coarsened sharply when the amount of TiO 2 coating was over 70%. In addition, the porosities and total length of solidification cracks in the FZ were reduced by the CaF 2 and TiO 2 coatings. The ultimate tensile strength value of the welded joints increased with the addition of TiO 2 coating but decreased sharply when more TiO 2 coating was adopted.
21