Pipe would be classified as what type of discontinuity?

The question asks to classify "Pipe" as a type of discontinuity. In the context of metallurgy and Non-Destructive Testing (NDT), "pipe" often refers to a shrinkage pipe.

• A shrinkage pipe is a cavity that forms in the top portion of an ingot or casting as the molten metal solidifies and contracts. This is a common defect in cast materials.

Let's examine the types of discontinuities:

• a) Inherent discontinuities are those that originate during the initial solidification of the molten metal, such as during casting or ingot formation. Examples include shrinkage (like a shrinkage pipe), porosity, and inclusions.
• b) Processing discontinuities are introduced during subsequent manufacturing or fabrication steps, such as forging, rolling, welding, or machining. Examples include laps, seams, laminations, and welding defects.
• c) Service discontinuities develop during the component's operational life due to factors like fatigue, corrosion, or erosion.
• d) None of the above

Since a shrinkage pipe forms during the initial solidification of the material, it is classified as an inherent discontinuity.

The correct option is (a).

a) Inherent