I think Its written in two forms depending on the type of testing you are going to do. For instance if you follow over to the right of Table 4.1 you notice that "bend tests" are used in stud welds also, there is a figure for the stud weld bend testing in B.5D and it is not a "guided" bend. However the 3 common bend tests that are coming for straps are labeled as "guided" I don't think there needs to be 8 bends, only 4, it is just depending on the type and weld bending ability of the object being tested.
If you look at 4.7.6 its also states that guided bend tests shall be used. B2.1 id a very general common Spec and covers an array of AWS codes. I know it mixes D1.1, D1.2, and D1.6 and prob others so it covers a lot of ground.
Hope that helps somewhat
Jordan