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Effects of Post-weld Heat Treatment on Microstructure, Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

Authors :
Jianling Song
Aiping Wu
Meng Danyang
Yue Zhao
Dengkui Zhang
Tianyi Zhao
Jiguo Shan
Zhongping Zhang
Guoqing Wang
Source :
Acta Metallurgica Sinica (English Letters). 32:684-694
Publication Year :
2019
Publisher :
Springer Science and Business Media LLC, 2019.

Abstract

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows different microstructure and microhardness due to the different welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing effect on the weld and their existence was more of an adverse effect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.

Details

ISSN :
21941289 and 10067191
Volume :
32
Database :
OpenAIRE
Journal :
Acta Metallurgica Sinica (English Letters)
Accession number :
edsair.doi...........5111e62d9146b235fdb1fdcbe681a693
Full Text :
https://doi.org/10.1007/s40195-018-00869-w