Graduate Research School For Candidates Prospective Candidates Available Projects Improving heat source solutions to simulate the weld pool and residual stresses of multi-pass welded joints

Improving heat source solutions to simulate the weld pool and residual stresses of multi-pass welded joints

Title of Project

Improving heat source solutions to simulate the weld pool and residual stresses of multi-pass welded joints

Name of Advisor/s

Dr Greg Wheatley, Dr Ninh Nguyen (HRL Technology, Melbourne)

College

College of Science & Engineering

Summary of Project

The goal of the project is to improve current heat source solutions[5][6] and use them to simulate the weld pool and residual stresses of multi-pass welded joints. A modified heat source with analytical formed solution has been developed. Simulation cases will be run to test the solution and develop the solutions. The work can be divided into three areas. Firstly, programming in conjuction with Ansys will be required. Previous Fortran source codes can be used as a reference. It is envisaged that C-sharp will be used to do the programming to calculate the temperature from scratch i.e. write a new program for that and output weld pool boundary and HAZ boundary for each weld pass. Secondly, specimens will be prepared and ideally filmed with a high-speed camera to measure the weld pool image whilst welding and measure welding residual stresses using more advanced technique (like Laser diffraction using ANSTO facility). However, if these methods are unavailable, traditional methods to measure the weld pool metal profile and residual stresses by cutting the welded samples will be conducted. Finally, finite element analysis (FEA) can be used in parallel with the analytical solutions to compare the results. We will calibrate the heat source parameters to comparable weld pool shapes for both FEA and Analytical solutions, we can run a program to calculate transient temperature field for a multi-passed welding and use it for Residual stress calculations of that welded joint.

Keywords

Welding, Residual Stress, finite element analysis (FEA)

Would suit an applicant who

has a sound academic background, research experience, an interest in mechanical engineering and strong experimental and computational skills.