Question

Internal concavity is a ______ that is properly fused to and completely penetrates the pipe wall thickness along both sides of the bevel, but whose center is somewhat below the inside surface of the pipe wall.

a) Welding defect
b) Structural flaw
c) Welding process
d) Pipe anomaly

Answer 1

Internal concavity is a welding defect that penetrates the pipe wall, suggesting excessive contraction of the weld metal that may affect the joint strength.

Step-by-step explanation:

Internal concavity is a welding defect that is properly fused to and completely penetrates the pipe wall thickness along both sides of the bevel, but whose center is somewhat below the inside surface of the pipe wall. In the context of welding, this concavity is considered a defect because it can indicate that the weld metal has contracted excessively as it cools and solidifies, leading to reduced cross-sectional thickness and potentially diminished strength, which can affect the integrity and pressure-bearing capability of the welded joint. This type of defect is a problem that involves ensuring the right welding parameters and techniques are used to produce a sound joint.