Question

an excessively large keyhole at the bottom (overhead section) of a pipe weld is typically an indication of?

○ excessive penetration
○ cold lap
○ excessive suckback
○ lack of fusion

Explanation:

In pipe welding, an excessively large keyhole at the bottom (overhead section) is typically an indication of excessive penetration. Excessive penetration occurs when the weld metal penetrates too far through the joint, leading to a large keyhole. Cold lap is a defect related to incomplete fusion of a weld pass with the base metal or previous pass, lack of fusion is the failure to fuse the weld metal with the base metal or between weld passes, and excessive suckback is related to the shrinkage of the weld metal causing a cavity, not a large keyhole.

Answer:

A. excessive penetration