Welding residual stress evaluation of T-joint considering rolling stress and heat treatment stress relief research
[Objective]Welding residual stress seriously affects the mechanical properties and fracture strength of welded structures,so it is necessary to accurately evaluate and reduce the stress.[Methods]The welding and annealing heat treatment residual stress of a 30 mm T-joint of EH550 steel with multipass weld-ing are measured by the non-destructive X-ray diffraction.The macroscopic metallography of the examined T-joint is obtained by means of wire-cutting and corrosion polishing,then used to establish a finite element(FE)mesh model in ANSYS.The rolling stress of EH550 is taken as the initial state for transient welding thermo-elastic-plastic FE analysis,and the predicted residual stress of the examined T-joint is compared with the measured results.Finally,based on welding FE computation,annealing heat treatment is computed while con-sidering material creep,and the influence of the heat treatment parameters on the welding residual stress is ex-amined.[Results]The predicted residual stress after welding and annealing heat treatment is in good agree-ment with the test results.After heat treatment,the extreme residual stress decreases from more than 500 MPa to around 100 MPa.[Conclusion]The results of this study can provide useful references for the accurate evaluation and analysis of the welding residual stress of high strength steel plates,and the formulation of the process of eliminating residual stress by annealing heat treatment.
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