weld beads are not considered in simulation.
we have to model weld as separate part or as multi-body and provide the bonded contact between the touching faces.
this is how you have to consider weld in analysis
For static studies you can use the "edge weld connector" to size the weld.
It's been our experience that the best way to be sure is to go ahead and model the welds in the 3D solid.
I finally got around to writing up the basics of it in a short book,