Magnetic Particle Inspection Level 1 Practice Exam

Which of the following is not a common casting discontinuity?

1. Cold shuts

2. Hot tears

3. Crater defects

4. Weld porosity

The correct answer is: Weld porosity

Weld porosity is not considered a common casting discontinuity because it specifically pertains to defects that occur during the welding process, rather than during casting. In contrast, cold shuts, hot tears, and crater defects are all issues that can arise within the casting process itself. Cold shuts are formed when two streams of molten metal do not fuse properly upon cooling. Hot tears occur from the shrinkage and thermal stresses in the metal as it cools, leading to cracking. Crater defects are depressions that can form on the surface of a casting, often caused by gas entrapment or improper pouring methods. Since weld porosity relates directly to fused metals that have air pockets or voids created during welding, it does not fall under the casting-related defects like the others. Understanding these distinctions helps in identifying and addressing specific defects associated with different manufacturing processes.