Friction Stir Welding (FSW) offers significantly better performance on aluminum alloy joints compared to the conventional fusion arc welding techniques; however, plastic deformation, visco-plastic flow of metals, and complex non-uniform heating cycles during FSW processes, result in dissolution of alloying elements, intrinsic microstructural changes, and post-weld residual stress development. As a consequence, about 30% reduction in ultimate strength (UTS) and 60% reduction in yield strength (YS) were observed in defect-free, as-welded AA2219-T87 joints. PWHT is a common practice to refine grain-coarsened microstructures which removes or redistributes post-weld residual stresses; and improves mechanical properties of heat-treatable welded aluminum alloys by precipitation hardening. An extensive experimental program was undertaken on PWHT of FS-welded AA2219-T87 to obtain optimum PWHT conditions and improvement of the tensile properties. Artificial age-hardening (AH) helped in the precipitation of supersaturated alloying elements produced around weld nugget area during the welding process. As a result, an average 20% improvement in YS and 5% improvements in UTS was observed in age-hardened (AH-170°C-18h) specimens as compared to AW specimens. To achieve full benefit of PWHT, solution-treatment followed by age-hardening (STAH) was performed on FS-welded AA2219-T87 specimens. Solution-treatment (ST) helps in the grain refinement and formation of supersaturated precipitates in aluminum alloys. Age-hardening of ST specimens help in the precipitation of alloying elements around grain boundaries and strengthen the specimens. Optimum aging period is important to achieve better mechanical properties. For FS-welded AA2219-T87 peak aging time was 5 hours at 170°C. STAH-170°C -5h treated specimens showed about 78% JE based on UTS, 61% JE based on yield strength, and 36% JE based on tensile toughness values of base metal.
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ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing
June 4–8, 2017
Los Angeles, California, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-5073-2
PROCEEDINGS PAPER
Effects of Post Weld Heat Treatments (PWHT) on Friction Stir Welded AA2219-T87 Joints
Mohammad W. Dewan
,
Mohammad W. Dewan
Dhaka University of Engineering and Technology, Gazipur, Bangladesh
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Muhammad A. Wahab
,
Muhammad A. Wahab
Louisiana State University, Baton Rouge, LA
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Khurshida Sharmin
Khurshida Sharmin
Dhaka University of Engineering and Technology, Gazipur, Bangladesh
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Mohammad W. Dewan
Dhaka University of Engineering and Technology, Gazipur, Bangladesh
Muhammad A. Wahab
Louisiana State University, Baton Rouge, LA
Khurshida Sharmin
Dhaka University of Engineering and Technology, Gazipur, Bangladesh
Paper No:
MSEC2017-3021, V002T01A019; 8 pages
Published Online:
July 24, 2017
Citation
Dewan, MW, Wahab, MA, & Sharmin, K. "Effects of Post Weld Heat Treatments (PWHT) on Friction Stir Welded AA2219-T87 Joints." Proceedings of the ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. Volume 2: Additive Manufacturing; Materials. Los Angeles, California, USA. June 4–8, 2017. V002T01A019. ASME. https://doi.org/10.1115/MSEC2017-3021
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