What type of indication appears as a crater crack in metal inspections?

A dish-shaped flaw extending from a center is characterized by its crater-like appearance, which resembles a depression or indentation in metal. This type of flaw typically forms due to processes such as corrosion or fatigue, leading to a weakening of the material over time. The crater shape indicates that the flaw is not just a surface imperfection, but rather a more significant defect that can have implications for the integrity of the metal.

The crater crack's distinct, cup-like form makes it visually identifiable during inspections, which is crucial for assessing the condition of metallic structures and ensuring safety and durability. Inspectors look for these types of imperfections to evaluate any potential risks associated with the material's load-bearing capacity.