js55, in checking QW-100 in total, the only NDE I can find that may be used in lieu of mechanical testing is RT. Of course, that is NOT saying that the constructing codes may not require a UT in addition...
ASME Code Case 2235 got it's start in 1996. This code case involves UT in lieu of Radiography. Rev 2 included TOFD and > 1/2" thickness and so on. The most recent revision of this code case that I have read is dated Oct, 11 2005 which is rev 9 or 2235-9 A little bit after approval dates for the 06 addenda. It covers Section I PW 11, Section VIII Div 1 para UW-11(a), VIII Div 2 table af 241 and section XII TE 230.1. In all but one case, it requires automated. The sole exception to the AUT part is for phased array which goes up to a minimum of 1".
I've heard tale that another one is out now as of 07 but haven't laid eyes on it yet, however I've been told it is a mod for TOFD requirements in relation to ref blocks and planar.
I've also been told that one is in the breach for Section IX, but it is still in committee, so at this point in time, UT is "not" allowed for Section IX quals to my knowledge. (ref QW 302.2 and QW 304.
As for AWS Section 4 part C para 4.19.1.1 substitution of RT for guided bend test. No allowance for UT there either.
In short, It's not allowed at this point in time. It should be, it's a much better exam.
Regards,
Gerald