welding modelling

Hi all,

        I am trying to simulate the laser welding of butt joint in ANSYS to find out the residual stress after the welding. Can anyone help in modelling the welding process in any way like suggesting the basic important literature and how to model the moving heat flux. Do we need to define the elements at the bead in modelling the welding proicess?. In laser welding we dont have the filler material in that case how those plates are joined in simulation?.

Is there any kind of tutorial available in ANSYS to model the welding process.