Effect of different pre- and post-weld heat treatments on microstructures and mechanical properties of variable polarity TIG welded AA2219 joints

Science and Technology of Welding and Joining - Tập 21 Số 3 - Trang 234-241 - 2016
Yutao Lin1,2, D. P. Wang1,2, Mingchao Wang3,1, Yuxuan Zhang1,2, Yun He1,2
1School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
2Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China
3Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin, 300072, China

Tóm tắt

The microstructures and mechanical properties of 2219 aluminium alloy joints welded by variable polarity TIG welding in four kinds of different heat treatment conditions, namely, with/without pre-/post-weld heat treatment, were analysed and compared. The post-weld artificial aging treatment rendered fine dispersed precipitates (metastable θ′ phase) separate out of weld metal, which made the hardness of weld metal increase by ∼20%. Meanwhile, the fracture location of joints during tensile test changed from weld zone to heat affected zone (HAZ). The pre-weld solution treatment reduced the overaging degree of HAZ and a large number of θ′ phase reprecipitated in HAZ after post-weld artificial aging treatment. Intermediate state welding, with pre-weld solution treatment and post-weld artificial aging treatment together, could increase 20% of the hardness of weld zone, increase 11.5% of the hardness of HAZ and increase 20.3% of the tensile strength of joint.

Từ khóa


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Thông tin xuất bản

Science and Technology of Welding and Joining

Tập 21 Số 3

234-241

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