Recently, I finished a FEA model for a pressure vessel. the solid model was developed by another engineer. it had one very high stress location in an unexpected location. the constraints he use to locate the parts i found unusual. The pressure vessel had a bolt flat end cap on one end a weld head on the other. The flat end cap was not constrained using the features in the welded housing. The end cap was constrained using a part that would normally be installed later in the assembly process. I would think it not make a difference. The FEA modeler locates all the parts using connections, etc. Has anyone an issue between constrains and connection causing high stress location?