Thanks for the replies everybody, I start testing next Monday. Seems to be that with a 60* included angle, 1/8" root opening seems to be the norm. This is only one test out of many that I will be taking next week. I'll keep everybody posted.

Hey guys, I have a welding certification coming up in a couple of weeks with my employer. The first part of the test will be 3/8 plate 60 degree including angle, 1/4 backing plate with 1/8" root opening, in the vertical up position. My test instructors are pre-tacking all of the test pieces for...