Perhaps not he best platform to ask this question, but I have seen an increase in use of GD&T in weldment drawings, some with ridiculous tolerances not attainable in the welding process, even with the use of jigs. I was wondering if GD&T is allowed to be used to specify geometric tolerances (no machining, welding process only) with respect to parrallelism, flatness, straightness, angularity and perpendicularity in an weldment? Is this specifically mentioned in any standard?
Weldments are not excluded from ASME Y14 or Y14.5 (GD&T) specificially. They are in scope.
It is unfortunate that an engineer is applying ridiculous tolerances. I would not blame GD&T for it, though. The whole idea of GD&T is to loosen up tolerances where it doesn't matter and allow an engineer to apply the largest tolerances permissable where it does matter.