APDL for moving heat source in welding

Dear all,
    Presently I am working on the Controlling the Residual stresses in ARC welding.For this the FEM tools have to use.But while sumulating the model,I have stuck up in modeling FEM by Element birth and Deat and the moving heat source.So plz if anybody is having Case study of moving heat source and Element Brith and death then,its my request to all ,to share it with me..