– Voids caused by metal contracting during solidification.
The heart of the is Section 6: "Acceptance Criteria for Surface Irregularities." The standard uses a series of Visual Accept/Reject Standards (VAS) depicted in figures. Here is a practical summary: mss sp-55 standard pdf
– Linear fractures; generally never acceptable. – Voids caused by metal contracting during solidification
: Internal or surface voids formed as the metal solidifies. Inclusions : Non-metallic material trapped in the casting. categorized into types:
The standard is unique because it relies on a series of reference photographs rather than just text. These photos illustrate various degrees of surface irregularities, categorized into types: