Thanks a lot for jumping in so quick Barry (@Get_Barried)!
@simscale7yahoo - I totally agree with Barry here and especially if you are working with forces you can use them as your convergence criterion. Convergence itself depends on the mesh quality as Barry already said and should be measured with physical quantities as just proposed. Sometimes converged solutions have a nice graph but the results are “numerical garbage” so better be skeptical in any case.
Cheers!
Jousef