Numerical simulations of welding residual stresses in VPTIG-welded joints of the 2219 aluminum alloy

LI Yanjun; WU Aiping; LIU Debo; ZHAO Haiyan; ZHAO Yue; WANG Guoqing

doi:10.16511/j.cnki.qhdxxb.2016.22.035

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (10) : 1037-1041,1046. DOI: 10.16511/j.cnki.qhdxxb.2016.22.035

Numerical simulations of welding residual stresses in VPTIG-welded joints of the 2219 aluminum alloy

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Abstract

2219 aluminum alloy welded joints have significantly reduced strength because of the softening during welding. The influence of joint softening on the welding residual stress was studied using the thermal elastic plastic finite element method (T-E-P FEM) to predict the welding temperature and residual stresses in a variable polarity tungsten inert gas (VPTIG) welded 2219 aluminum alloy joint. The influences of work hardening and the annealing were also examined. The simulations show that joint softening significantly influences the longitudinal residual stress and that the longitudinal residual stresses in the weld zone and nearby regions are overestimated when the joint softening is not taken into account. Comparison of the simulated results with measured data shows that when work hardening, annealing and joint softening are considered, the residual stresses predicted by the T-E-P FEM agree well with the measured data, which indicates that this approach can accurately predict residual welding stresses in 2219 aluminum alloy.

Key words

residual stresses / 2219 aluminum alloy / thermal elastic plastic finite element method / welding

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LI Yanjun, WU Aiping, LIU Debo, ZHAO Haiyan, ZHAO Yue, WANG Guoqing. Numerical simulations of welding residual stresses in VPTIG-welded joints of the 2219 aluminum alloy[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(10): 1037-1041,1046 https://doi.org/10.16511/j.cnki.qhdxxb.2016.22.035

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