Influence of Lumped-pass Method on Calculation Accuracy and Efficiency of Welding Residual Stress in SUS304 Stainless Steel Butt Joints

doi:10.3901/JME.2019.12.072

Abstract

Abstract: Thick-plate stainless steel welded joints are widely used in nuclear power plants and chemical factories, and the welding residual stresses of these joints have always been a focus of attention. The finite element method has been recognized as an effective way to calculate welding residual stress. Because the welding process is a highly nonlinear problem, the computational efficiency cannot meet the requirements under the existing computing hardware conditions. Based on the ABAQUS commercial software, an efficient instantaneous heat source model is developed to simulate welding residual stress of a multi-pass butt-welded joint with 25 mm thickness. Meanwhile, the simulated results of welding residual stress distribution is compared with that obtained by the traditional moving heat source model. In order to further improve the calculation efficiency, different lumped-pass patterns are designed to shorten the computing time. Experiments are also carried out to measure the residual stress distribution of the butt-welded joint. The comparison between the numerical results and the measured data shows that both the moving heat source model and the instantaneous heat source model can accurately predict welding residual stress, and the computing time of the latter is much shorter than that of the former. In addition, the influence of lumped-pass method on the residual stress of a multi-pass butt-welded joints with 75 mm thickness is investigated numerically. The numerical simulation results show that different lumped-pass patterns have a little effect on the longitudinal residual stress, but have a significant influence on the transverse residual stress. The calculation efficiency can be greatly improved by adopting instantaneous heat source and lumped-pass method, and this combined method will be an effective approach to solve the problem of residual stress calculation for thick-plate welded joints.

Key words: calculation accuracy, calculation time, instantaneous heat source, lumped-pass, residual stress

CLC Number:

TG404

HU Xing, DAI Peiyuan, ZHANG Chaohua, LI Suo, DENG Dean. Influence of Lumped-pass Method on Calculation Accuracy and Efficiency of Welding Residual Stress in SUS304 Stainless Steel Butt Joints[J]. Journal of Mechanical Engineering, 2019, 55(12): 72-82.

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