Hi Fellas, I'm trying to help a welder prepare for his CWI exam and ran into a problem with a practice question. I have searched for far to long and now need to swallow my pride and ask for assistance. If you could please just give me a hint as to a key word to search or the like, instead of the exact location I would be very appreciative. It seems like such a simple question I am feeling like a heel!! Here goes:
"What is the maximum gap permitted between the back side of a butt joint and its backing bar?"