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.
Gas porosity appears as small, round, or elongated dark spots on a radiograph. It is caused by gas bubbles becoming trapped in the metal as it solidifies. ASTM E155 provides reference images showing different densities of gas porosity, allowing inspectors to determine if the distribution is within acceptable limits for the specific grade of casting.
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By mastering ASTM E155, you ensure that every casting that leaves your facility—whether it’s destined for an aircraft wing or an electric vehicle battery housing—meets the highest standard of structural integrity.
ASTM E155, officially titled "Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings," is a document published by ASTM International (formerly the American Society for Testing and Materials). Unlike a typical procedural standard, ASTM E155 is a collection of reference radiographs—essentially, a visual catalog of X-ray images. Hence, ASTM E155 is the dedicated standard for
Most modern PDF software allows annotation. You can add a stamp or text note on the PDF stating: "Radiograph #2024-089 matched to ASTM E155, Vol I, Dendritic Shrinkage, Severity Level 2 – Accepted." Save this as part of your inspection record.
In the world of Non-Destructive Testing (NDT), precision is not a goal; it is a requirement. When critical metal components—such as those used in aerospace, automotive, or nuclear industries—need to be inspected for internal flaws, radiography is the go-to method. However, an X-ray image is only as good as the interpreter's ability to understand it. This is where the standard known as becomes indispensable. radiography is the go-to method. However
It is used as a reference to establish acceptance standards between purchasers and manufacturers. Structure of the Reference Radiographs ASTM E155 is divided into two primary volumes:
ASTM updates E155 every 5–10 years. Using a 1995 PDF in 2025 will likely be non-compliant. Always check the “active” status on ASTM.org. The current version as of 2025 is (or later). Your Astm E155.pdf filename should include the year (e.g., E155-20.pdf).
ASTM E155 is the Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings. Published by ASTM International (formerly the American Society for Testing and Materials), this standard serves as the industry benchmark for evaluating the quality of castings using radiographic (X-ray or gamma-ray) inspection.