Numerical Simulation of Temperature Fields and Residual Stresses in Multi-Pass Weld Using the Novel Prescribed Temperature Approach with Experimental Validation

In this article, a V-groove weld joint of P92 steel, typically used in ultra-supercritical power plants, has been numerically analyzed to estimate transient temperature distributions and residual stresses. A weld simulation model using Prescribed Temperature approach was developed. This approach was used to reduce the computational expenditure and speed up the time-intensive analysis setup. The finite element method was employed to compute the residual stresses generated in the weld region and the heat-affected zone along the thickness of the plate. In the experimental investigation, the through-thickness residual stresses were measured using the deep-hole drilling (DHD) method. Good agreement was observed between numerically and experimentally obtained residual stresses. The maximum temperature was observed at the weld pool area which decreased in the parabolic trend toward the base metal.