Determination of Residual Stress and Effects in Thick-Section Weldments forHydraulic Structures

摘要

The primary objective of this research was to develop numerical methodology whichmay be used to predict thermal and residual stress fields created by welding of thick plates and to verify the results experimentally. A two-dimensional thermomechanical finite element model was developed and is described in this report. Methods for modeling heat input of welding considering arc movement and number of weld passes were developed. The methods which were developed are referred to as ramp heat input and lumping. Five experiments were carried out using 1/2-in. and 1 -in. steel plates with various weld geometries including single-bevel, single-V and double-V groove welds. This report describes experimental techniques which were used to measure temperature and residual stress. Experimental results are compared with analytical predictions. The finite element model developed by this research can be used to predict thermal and residual stress fields which are created during welding of thick plates. Finite element modeling, Thermal loading, Heat input, Thermal strain, Residual stress, Welding.