Effects of Yield Strength of Weld Metal and Material Strain Hardening on Prediction Accuracy of Welding Residual Stress and Deformation in a Q345 Steel Joint

doi:10.3901/JME.2021.10.160

Abstract

Abstract: Establishing a suitable material model is the key to accurately predict welding residual stress and deformation by finite element method. Based on ABAQUS code, a thermal-mechanical finite element method is developed to predict the welding residual stress and deformation of the Q345 steel butt joint. Effects of the yield strength of weld metal and material strain hardening on the welding residual stress and deformation are analyzed by means of numerical simulation. Compared with the simulation results of ideal elastic-plastic model, the material model considering the yield strength of the base metal and the weld metal significantly increases the longitudinal residual stress of the weld zone and its vicinity. The material model considering the strain hardening and annealing softening effect obviously increases the longitudinal and transverse residual stresses in the lower surface of the weld joint. The material model considering the yield strength of weld metal, and the material model considering material strain hardening have slight effect on the angular distortion of the butt joint. Comparison between numerical simulation results and experimental results, in order to accurately predict the welding residual stress and deformation of Q345 steel multi-pass welded joints, the yield strength of the base metal and weld metal should be separately considered, as well as the strain hardening and annealing softening effect. The material model proposed lays a theoretical foundation for accurately predicting welding residual stress and deformation in Q345 high-strength low alloy steel joints or structures by finite element method.

Key words: high strength low alloy steels, yield strength of weld metal, strain hardening, residual stress, deformation, numerical simulation

CLC Number:

ZHANG Chaohua, WANG Xiaoxia, CHANG Maochun, WANG Hu, YE Yanhong, DENG Dean. Effects of Yield Strength of Weld Metal and Material Strain Hardening on Prediction Accuracy of Welding Residual Stress and Deformation in a Q345 Steel Joint[J]. Journal of Mechanical Engineering, 2021, 57(10): 160-168.

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