?What type of grinding disk must be used to feather the edge of tack welds?
A. ?A standard grinding stone as long as the root opening has not decreased due to the tack weld shrinkage.
B. ?A thin grinding disk.
C. ?A new disk so it can reach all the way down into the groove.
D. ?A cupped disk so it is easier to work around the curve of the pipe.
Answer: B
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