?What can be done to make it easier to set the root opening for tack welding?
A. ?Bend a piece of filler rod in a U-shape and place it between the ends of the pipes.
B. ?Use a piece of tungsten as a spacer because it will not melt and it is hard enough to resist the forces of the tack weld bead shrinking.
C. ?Measure the gap carefully with a steel rule or tape measure.
D. ?Using a smaller diameter nozzle cup, place it in the groove to keep the pipe ends spaced as the tack weld is made.
Answer: A
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