I too, being an SCWI (and "former" B5 Secretary), am embarrassed to admit my ignorance of this topic, I had never really noticed it. There's likely 1000's of CWI's who've prepared, oh, maybe a few hundred thousand or so WPS.' In my case, it's certainly NOT an ethical issue unless that CWI feels incompetent to develop WPS/PQR's and then does so anyway. As much as I hate to say it, perhaps this was one method of the committee's differentiating between what an SCWI can do over and beyond what a CWI may do? I'm just pondering this question, not making rash statements. By the same token, I've met many a CWI whom I felt far more qualified than any other "authorized individuals" to prepare WPS/PQR's... a very good and valid question has been raised and I too would like an answer.
I think I'll be leaving the weld engineering to weld engineers. As a CWI, NDE III, and having some background in welding, I could probably make a go at development of a welding procedure.
However; I do not believe I am the best fit for it. A weld engineer/SCWI may know a thing or two about NDE, but in my experience, that usually fubar the procedure unless it's a very simple one such as a type 2 method C PT, or A scan for lamination's UT. The same applies in reverse, I don't develop weld procedures day in and day out, I count myself as knowledgeable in welding and learn as much as I can as that knowledge has direct application to the NDE of the same, but that's a world of difference between laying a bead down every day of your life vs scrubbing shoes, or roasting a target every day of your life.
There are just to damn many things a person needs to know to be a true weld engineer, and the same is true for NDE, especially the dynamic volumetric methods such as UT. Unless the person has a photographic memory, enough books to build a house with, and no life at all, they cannot maintain proficiency and stay up to date in it all.
There is no such thing as an "expert".. an expert knows it all, and there is no one that fits that bill except God. Therefore in my opinion, the task should be left to people who've spent a few years of their life studying the matter in school, or have been doing it so long they've forgotten more than most will ever know.
That's my personal take on the matter. Having said that, I've also seen wannabes totally fubar weld procedures, NDE procedures, QA programs, and all the above trying to be a hero.
Ethics seems to be something everyone likes to quote, but when it gets down to the rat killing with the cash on the table, thats when you find out if they have ethics or not.
Trying to define it by procedure in my opinion is like trying to define human nature, it just can't be done.
My two cents worth,