Question

an excessively large keyhole at the top of a pipe weld is typically an indication of?
excessive penetration
excessive reinforcement
insufficient penetration
lack of fusion

Explanation:

In welding, a keyhole is related to penetration. An excessively large keyhole at the top of a pipe weld indicates that the weld has gone too far through the material, which is excessive penetration. Excessive reinforcement relates to the weld's buildup, insufficient penetration is when the weld doesn't go through enough, and lack of fusion is when the weld doesn't fuse the base metals. So the correct option is "excessive penetration".

Answer:

A. excessive penetration