Microscopic structure and property of double-electrode gas metal arc welding of AZ31B magnesium alloy

  • Guohong Ma (马国红)
  • Xu Shen (沈 旭)
  • Qiwen Ping (平奇文)
  • Jun Nie (聂 军)
  • Jia Ye (叶 佳)
Article
  • 34 Downloads

Abstract

This paper focuses on the research on double-electrode gas metal arc welding (DE-GMAW) of AZ31B magnesium alloy sheet with 2mm thickness. During the welding process, stable hybrid arc of metal inert gas (MIG) and tungsten inert gas (TIG) is employed as welding heat source. Optical and electron microscopes are used to observe the microstructures of the weld joint. X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) are employed to identify the components in fusion zone. Microhardness is also tested. When the MIG current is 80A, the perfect weld joint is obtained, though figures of fish scales are observed in all joints in the research. The fusion zone is formed by dendrites, where β-Mg17(Al, Zn)12 is dispersed. The hardness in fusion zone and heat affected zone (HAZ) is lower than that in base metal (BM). The average Vickers hardness of fusion zone and HAZ is about 58 and 56 respectively, while the Vickers hardness of BM is about 63.

Keywords

electrode gas metal arc welding (DE-GMAW) dendrite eutectic reaction AZ31B magnesium alloy 

CLC number

TG 444.2 

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Copyright information

© Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Guohong Ma (马国红)
    • 1
  • Xu Shen (沈 旭)
    • 1
  • Qiwen Ping (平奇文)
    • 1
  • Jun Nie (聂 军)
    • 1
  • Jia Ye (叶 佳)
    • 2
  1. 1.School of Mechanical EngineeringNanchang UniversityNanchangChina
  2. 2.Electronic Lens CenterUniversity of KentuckyLexingtonUSA

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