Which is the command in order to model residual welding stresses in LS-DYNA?

[ADroutsas]

I have modelled a heavily welded structure in LS-DYNA and I am using implicit method to solve it as the problem is static. Which is the correct command (keyword) in LS-DYNA in order to model initial stresses such as the residuals from the welding procedure? I am using the keyword: “*Initial_Stress_Shell_Set” and I am introducing the tensile and compressive stresses at the respective shells. However, this command seems that it doesn’t work as the results do not make sense. It looks like this keyword affects only the first step of the solution. Is there any respective command such as: “inistate” that is used in Ansys?