I think I know the area of the sample test you are in. Either question 36 or 37.
I just finished helping to instruct a class for CWI candidates. One of the questions in the sample D1.1 code section is this:
37. For the prequalified joint B-L2c-S, what is the range of root face dimensions, as fit-up, permitted for a base metal thickness of 1 inch?
a) 3/16 to 5/16 inch
b) 1/4 to 5/16 inch
c) 1/4 inch maximum
d) Not limited
e) 0 to 5/16 inch
In D1.1 it says that the groove preparation tolerance for the root face, as detailed, is " f = +0,-f ". It is the only " -f " I could find in the tables. I thought this must just be a typo, but went back for years in the D1.1 and looked it up in the AISC Steel Construction Manual and it has been there for years. Since we don't do SAW here and have not dealt with SAW for years, I have never noticed it. I wrote to AWS and did not get a good answer to what is meant by " -f ". Does it mean that you can have anything from the given dimension in the previous column to no root face (a knife edge) since a -f = (the given dimension minus itself) = 0? Can anyone here provide a better answer?