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Plates (37 mm thick) of 6005A-T6 aluminum alloy were butt joined by a single-sided and double-sided friction stir welding (FSW). The 3D residual stresses in the joints were determined using neutron diffraction. The microstructures were characterized by a transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). In the single-sided FSW specimen, there were acceptable mechanical properties with a tensile strength of 74.4% of base metal (BM) and low residual stresses with peak magnitudes of approximately 37.5% yield strength of BM were achieved. The hardness is related to the grain size of the nugget zone (NZ), and in this study, precipitations were dissolved due to the high heat input. In the double-sided FSW specimen, there were good mechanical properties with a tensile strength of 80.8% of BM, but high residual stresses with peak magnitudes of approximately 70% yield strength of BM were obtained. The heat input by the second pass provided an aging environment for the first-pass weld zone where the dissolved phases were precipitated and residual stresses were relaxed.
Xiaolong Liu; Pu Xie; Robert Wimpory; Wenya Li; Ruilin Lai; Meijuan Li; Dongfeng Chen; Yuntao Liu; Haiyan Zhao. Residual Stress, Microstructure and Mechanical Properties in Thick 6005A-T6 Aluminium Alloy Friction Stir Welds. Metals 2019, 9, 803 .
AMA StyleXiaolong Liu, Pu Xie, Robert Wimpory, Wenya Li, Ruilin Lai, Meijuan Li, Dongfeng Chen, Yuntao Liu, Haiyan Zhao. Residual Stress, Microstructure and Mechanical Properties in Thick 6005A-T6 Aluminium Alloy Friction Stir Welds. Metals. 2019; 9 (7):803.
Chicago/Turabian StyleXiaolong Liu; Pu Xie; Robert Wimpory; Wenya Li; Ruilin Lai; Meijuan Li; Dongfeng Chen; Yuntao Liu; Haiyan Zhao. 2019. "Residual Stress, Microstructure and Mechanical Properties in Thick 6005A-T6 Aluminium Alloy Friction Stir Welds." Metals 9, no. 7: 803.
Repair welding is a popular method to repair the leakage zone in tube-to-tubesheet joint of shell-tube heat exchangers. But the repaired residual stresses are generated inevitably and have a great effect on stress corrosion cracking (SCC). In this paper, the effects of repair welding on residual stress were studied by finite element method (FEM) and neutron diffraction measurement. The original weld residual stresses calculated by FEM showed good agreement with neutron diffraction measurement results. After repair welding, the transverse residual stresses change very little while the longitudinal residual stresses are increased in the repair zone. In the nonrepair zone, both the transverse and longitudinal stresses are decreased. The repair welding times have little effect on residual stress distribution. With the increase of welding length and heat input, the residual stresses increase. Repair opposite to the original welding direction is recommended because the opposite welding direction minimizes the residual stresses.
Yun Luo; Wenchun Jiang; Dongfeng Chen; Robert C. Wimpory; Meijuan Li; Xiaolong Liu. Determination of Repair Weld Residual Stress in a Tube to Tube-Sheet Joint by Neutron Diffraction and the Finite Element Method. Journal of Pressure Vessel Technology 2018, 140, 1 .
AMA StyleYun Luo, Wenchun Jiang, Dongfeng Chen, Robert C. Wimpory, Meijuan Li, Xiaolong Liu. Determination of Repair Weld Residual Stress in a Tube to Tube-Sheet Joint by Neutron Diffraction and the Finite Element Method. Journal of Pressure Vessel Technology. 2018; 140 (2):1.
Chicago/Turabian StyleYun Luo; Wenchun Jiang; Dongfeng Chen; Robert C. Wimpory; Meijuan Li; Xiaolong Liu. 2018. "Determination of Repair Weld Residual Stress in a Tube to Tube-Sheet Joint by Neutron Diffraction and the Finite Element Method." Journal of Pressure Vessel Technology 140, no. 2: 1.