Xnapper| Discontinuity Type | Description & Visual Characteristics | | :--- | :--- | | | Irregular, ragged cracks occurring typically at changes in section size. Often oxided or discolored surfaces. | | Type II - Shrinkage | Jagged, irregular cavities or depressions. May appear as sponge-like porosity or dendritic structure. | | Type III - Inclusions | Non-metallic particles (slag, sand, oxides) embedded in the surface. Appear as distinct, foreign matter. | | Type IV - Gas Porosity | Rounded or elongated cavities, usually smooth-walled. Caused by trapped gas. | | Type V - Fins and Veins | Thin protrusions of metal usually found at parting lines or core prints (often removed by grinding). | | Type VI - Surface Roughness | General texture irregularities (metal penetration, burn-on) not classified as specific defects above. |