Abstract
Mechanical properties and microstructure of Al-Mg-(Sc, Zr) welded joint prepared by manual labor melt inert gas(MIG) welding method using Al-Mg and Al-Mg-Sc weld wire as filling materials were studied comparatively. The results show that the apparent recrystallization does not happen in heat-affected zone. It proves that Al-Mg(Sc,Zr) alloy has a high capability of resistance to weldiing heat-soften. Using Al-Mg-Sc welding wire as filling material can obviously refine the grains of weld seam and improve its strength. The layer of small equal-axe grains in fusion area improves the joint strength between welded metal and base metal. The coefficients of welded joints when Al-Mg-Sc and Al-Mg weldiong wire are used as filling material are greater than 0.90, respectively. The yield strength of welded joints with Al-Mg welding wire is only 187 MPa, one is as 287 MPa with Al-Mg-Sc welding wire, thus the working strength of the welded unit is greatly improved.
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Foundation item: Project (2003AA305020) supported by the Postdoctoral Science Foundation of China; project supported by the National High Technology Research and Development Program of China
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Jiang, F., Chen, Sl., Huang, By. et al. Microstructure and properties of Al-Mg-(Sc, Zr) welded joint. J Cent. South Univ. Technol. 12 (Suppl 1), 23–27 (2005). https://doi.org/10.1007/s11771-005-0365-6
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DOI: https://doi.org/10.1007/s11771-005-0365-6