Choose the letter of the correct answer.
On open-root V-groove butt joints how should the tack welds be prepared prior to the application of the root pass? (Obj. 15-1)
a. No preparation is required; these are deep penetrating electrodes and will burn out all slag and other defects
b. Remove slag and wire brush tacks
c. Remove slag, wire brush, grind, and feather tacks
d. None of these
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