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

In aluminum plate inspection, a dish-shaped indication with a spoke formation is characteristic of a crater crack. This type of defect typically occurs when there is a localized failure in the metal, often due to high-temperature exposure or rapid cooling that results in uneven contraction. The "dish" appearance comes from the depression or crater-like feature on the surface, while the spokes radiate outward from the center, resembling a wheel with spokes.

Crater cracks differ significantly from other indications. For instance, a lap refers to a type of defect caused during the rolling process where one layer of material folds over another, creating a surface that lacks the characteristic dish shape. A void represents an internal empty space within the material, typically without surface features resembling spokes. An inclusion involves foreign material embedded within the aluminum, which would not present the same visual features as a crater crack. Thus, the dish-shaped appearance with spokes specifically points to the presence of a crater crack in aluminum plate inspection.