Numerical Simulation of Electro-gas Welding of EH36 Offshore Steel Based on ABAQUS
In order to study the electro-gas welding process of EH36 offshore steel,a finite element model for calculating the welding temperature and stress fields of electro-gas welding was established by using finite element software ABAQUS.A combined heat source with an ellipsoid heat source and a Gaussian surface heat source was used,which was realized by using DFLUX subroutine.The weld filling was controlled by birth and death element technology.The physical parameters of the EH36 steel were obtained through experiments.Finally,the electro-gas welding process was simulated.The welding test was carried out,and the thermal cycle curves of typical positions of the plate were measured by thermocouple.The results show that the transverse residual stress after welding is tensile stress in the middle area of the vetical plate,and that is compressive stress in the remaining area.Longitudinal residual stress is large tensile stress in the weld and its nearby area,and the tensile stress rapidly decreases and transits to compressive stress far away from the weld.The calculated thermal cycle curve and the weld shape are consistent with the experimental results,which shows the accuracy of the model established in this paper.
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