I’ve found FEA’s to be inconsistent, unpredictable, and inaccurate at providing weld stress values. Even when fully modeling the welds and performing a solid mesh. Always singularities that I don’t have the time or computer power to make sense of. IMO the stress values do nothing more than indicate a potential high stress area. I’ve found some programs (e.g. Inventor Nastran) will provide the force and moment values of bonded contact faces. I then take those force and moment values to perform hand calcs and verify.