As shown, different defect types within the same casting may be assigned different allowable severity levels depending on component function and service conditions. The acceptance conditions for cast parts exceeding 19 mm wall thickness must be specified separately in the order, drawing, or test instructions.
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Non-spherical gas voids often appearing in clusters or strings. Shrinkage (Sponge): Porosity caused by the metal contracting as it cools. Foreign Material (Less/More Dense): As shown, different defect types within the same
: Evaluation is typically done within a 2-by-2 inch (51 by 51 mm) unit area. Shrinkage (Sponge): Porosity caused by the metal contracting
governs reference radiographs used to detect discontinuities in aluminum and magnesium castings. Among the five discontinuity categories (gas holes, sand inclusions, shrinkage, internal chills, and porosity ), porosity is one of the most critical for evaluating casting integrity.