In which type of scenario would an indication appear dish-shaped with a spoke formation in aluminum plate inspection?

In the context of aluminum plate inspection, the appearance of a dish-shaped indication with a spoke formation is characteristic of a crater crack. A crater crack typically occurs during the solidification of the metal or due to thermal stresses, and its distinctive spoke-like pattern radiating from a central point can be likened to the formation seen in such defects. This feature allows inspectors to quickly identify the nature of the defect during examinations.

The other types of indications are characterized differently. A lap, for instance, involves layers of metal being folded over one another and does not present in a spoke-like manner. A void is typically a gas pocket or a lack of material that may appear as a cavity, while an inclusion consists of foreign material trapped within the metal matrix, leading to irregular shapes that do not resemble the spoke formation associated with crater cracks. Thus, the specific characteristics of the indication in question align best with crater cracks in aluminum plate inspections.