A new method has been established by which the temperature and microstructural dependency of the flow stress in welding stress simulation tools such as WeldsimS can be relatively easily determined. The method is based on Satoh testing and on using an ideal plasticity law for the flow stress. It requires prior knowledge to the relevant CCT diagram.
Satoh test results for the X70 samples have been established along with the establishment of the approximate constitutive model for this steel type and applied in a case study (see Figure below).
The Satoh test.
Residual stress simulation based on the simplified method (blue curve) compared to simulation based on a constitutive model accounting for work hardening (green curve). The curves at the left figure are along the black surface line at the right figure, which shows one of two symmetric welded plates. The Satoh "test results" from which data for the simplified model are extracted are simulated using the work hardening model.
Published January 5, 2007