Effect of Micro-Alloyed Treatment for 5183 Welding Wire on Microstructure and Tensile Property of Welded Joint

Abstract:

5183 welding wire micro-alloyed using Sc, Zr, Er and automatic MIG welding system applied to weld 7A52 aluminum alloy. Optical microscope and universal tensile testing machine utilized to investigate microstructure and tensile property of welded joint, respectively. The results indicated that welded zone and fused zone was composed of uniform isometric crystal and tiny isometric dendrite crystal when the welded joint was fabricated by using 5183 welding wire micro-alloyed via rare earth element, respectively. Tensile strength and specific elongation of welded zone was improved utmostly when the 5183 welding wire micro-alloyed treatment via single Sc or Zr, respectively. Owing to mirco-alloyed treatment of 5183 welding wire by using Sc, Zr or Er, a large number of Al3Sc, Al3Zr, Al3Er granules had generated in micro-poll, which played heterogeneous nucleation role and refined microstructure of welded zone. Meanwhile, there emerged nanoscaled A13Sc, A13Zr, Al3Er strengthening phase dispersed in welded zone, which had led welded joint to exhibit exclent tensile strength.

• Periodical: Applied Mechanics and Materials (Volumes 633-634)
• Pages: 821-825
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.633-634.821
• Online since: September 2014
• Authors: Xiao Ming Wang*, Sheng Zhu, Zhi Hao Zhao, Qi Wei Wang, Xiao Dong Zhao
• Keywords: Micro-Alloyed Treatment, Microstructure, Rare Earth Metal, Tensile Properties, Welding Wire

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