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Microstructural and mechanical inhomogeneity in the narrow-gap weld seam of thick GMA welded Al–Zn–Mg alloy plates

Published online by Cambridge University Press:  17 November 2016

F.Y. Shu ,
Y.M. Sun ,
H.Y. Zhao ,
X.G. Song ,
Sh.H. Sui ,
W.X. He ,
P. He ,
B. Liu  and
B.Sh. Xu
F.Y. Shu
Affiliation:
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
Y.M. Sun
Affiliation:
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
H.Y. Zhao*
Affiliation:
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
X.G. Song
Affiliation:
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
Sh.H. Sui
Affiliation:
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
W.X. He
Affiliation:
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
P. He
Affiliation:
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
B. Liu
Affiliation:
School of Materials Science and Engineering, Jiangsu University of Scienece and Technology, Zhenjiang 212003, China
B.Sh. Xu
Affiliation:
National Key Laboratory for Remanufacturing, Beijing 100072, China
*
a) Address all correspondence to this author. e-mail: shufengyuan1987@163.com
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Abstract

Inhomogeneity may lead to premature failure and operationally determines the lifetime estimation of thick weld joints. Considerable novelty of this paper was the achievement of the microstructural and mechanical inhomogeneity, especially along the thickness direction, in the narrow-gap weld seam of thick gas metal arc (GMA) welded Al–Zn–Mg alloy plates. The microstructure of the weld seam was investigated by means of optical metallography, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrum (EDS), after which the phase composition was ascertained according to the x-ray diffraction (XRD) analysis and selected area diffraction analysis by TEM (TEM-SAD). The generation of intergranular short rod-shaped MgZn2 particles changed the distribution of precipitates on the grain boundary with intragranular ellipsoidal MgZn2 particles simultaneously formed as the strengthening phase, which rendered preferable mechanical performances to the bottom layer of the weld seam. The above conclusion was farther affirmed by micro fractography and EDS test results on the fractured surface of the tensile samples. In addition, the effect of following weld passes on the microstructure and micro hardness profile of the finished weld pass was investigated.

Keywords

inhomogeneitymicrostructuremechanical propertiesAl–Zn–Mg alloygas metal arc welding
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3948 - 3955
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Copyright
Copyright © Materials Research Society 2016 

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References

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