Microstructure Characteristic of AZ31/7005 Joints by GTAW with Filler Wire of Mg-Al Alloy

Abstract:

Mg/Al dissimilar materials were welded successfully by GTAW with SAlMg-1 and SAlMg-2 welding wire of Mg-Al system. The nice weld shape and free defects of joints are obtained. The test results indicated that continuous lamellar intermetallic compounds is not found The structure of Mg side in the fusion zone is composed of α-Mg solid solution+ β-Al₁₂Mg₁₇ eutectic structure and precipitates β-A1₁₂lMg₁₇ on the grain boundary. The structure in the weld zone is mainly α-Mg solid solution + β-A1₁₂lMg₁₇ solid solutions. Mg and Al content are stable in the fusion zone of Mg side. However, in the weld zone of Mg side the Mg content is decreased gradually, and the Al content is increased that reaches a stable level in the weld zone of Al side. As a result, when Mg content in the wire can hold a proper level, the intermetallic compounds will be controlled effectively, and the performance of AZ31/7005 welding joint can be improved.

• Periodical: Advanced Materials Research (Volumes 1004-1005)
• Pages: 168-171
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1004-1005.168
• Online since: August 2014
• Authors: Hong Yan Du*, Yaj Jang Li, Juan Wang
• Keywords: GTAW Welding, Mg/Al Dissimilar Materials, Microhardness, Microstructure

References

[1] J. Wang, Y.J. Li, P. Liu, H.R. Geng: J. Mater. Pro. Tech. Vol. 205 (1-3) (2008), p.146.

[2] P. Liu, Y. J. Li, H. R. Geng, J. Wang: Mater. Lett. Vol. 59 (16) (2005), p. (2001).

[3] A. E. Shapiro: Weld. J. Vol. 84 (10) (2005), p.33.

[4] B. Rattana: Sci. Tech. Adv. Mate. Vol. 6(2) (2005), p.199.

[5] L. M. Liu, J. H. Tan, X. J. Liu: Mater. Lett. Vol. 61 (11-12) (2007), p.2373.

[6] E. Schubert, M. Klassen, I. Zerner, C. Walz, G. Sepold: J. Mater. Pro. Tech. Vol. 115(1) (2001), p.2.