Three Dimensional Numerical Simulation of Various Thermo-mechanical Processes by FEM (Report IV) : Deformation Analysis of Pipe-Plate Joint with Holes by Multi-pass Welding(Mechanics, Strength & Structural Design)

概要

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Residual deformations and stresses of a pipe-plate joint with holes after multi-pass welding are analyzed. The numerical simulations are performed using the thermal-elastic-plastic Finite Element Method and three dimensional solid elements are used. The shrinkages of the joint and deformations of holes for bolts which locate around the pipe are analyzed using different geometrical models and welding conditions. The change of the shape and the location of the holes after the circular fillet welding between the pipe and the plate are analyzed. Half-circle joint model and full-circle joint model, instantaneous heat source and moving heat source, single-pass and multi-pass weldings are considered for comparison. The computed results provide a great deal of informations which are very useful for predicting the effects of various welding conditions on residual deformations and also useful for controlling the geometrical accuracy of the pipe-plate joint. The transient and the residual stresses due to the multi-pass welding are also analyzed.
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