Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 21, Issue 3, Pages 234-241Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1362171815Y.0000000087
Keywords
Microstructures; Mechanical properties; Heat treatment; Intermediate state welding; Variable polarity TIG; 2219 aluminium alloy
Funding
- National Natural Science Foundation of China [51275343]
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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 theta' phase) separate out of weld metal, which made the hardness of weld metal increase by similar to 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 theta' 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.
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