The inspector’s job is to match the production radiograph to the closest severity level. If the casting’s indications are worse than the acceptable level defined by the engineering drawing (e.g., Level 3), the part is rejected.
Aluminum and magnesium alloys are lightweight materials extensively used in aerospace, automotive, and defense industries. However, their low density and unique solidification behaviors make them prone to specific types of porosity and shrinkage. Standard steel radiographs (like ASTM E446 for steel) are not applicable because the X-ray absorption characteristics of aluminum and magnesium are vastly different. Hence, ASTM E155 is the dedicated standard for these critical alloys. Astm E155.pdf
Using the bookmarks panel in your PDF reader (Adobe Acrobat or similar), locate "Shrinkage – Dendritic." Select the thickness range that matches your casting (e.g., 0.25–0.5 inches). The inspector’s job is to match the production
