Some NDT training schools offer study guides that include extracted, annotated versions of ASTM E155 porosity levels for educational purposes. These are not full standards but can serve as a quick-reference repack.
: The casting is radiographed using established radiographic techniques (typically following ASTM E94 guidelines).
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The core of ASTM E155 is its severity levels, which define how much porosity is allowed. The standards typically classify porosity levels from 1 to 5, where represents the lowest (best) porosity, and Level 5 represents the highest (worst) porosity.
: Further divided into "Feathery" (elongated, streak-like) and "Sponge" (massive, equiaxed) types. Application and Interpretation astm e155 porosity levels pdf repack
Minute voids distributed throughout the casting, appearing as dark spots on a radiograph.
: Typically divided into specific thickness ranges, commonly up to 2 inches (50.8 mm).
. Higher severity grade numbers indicate MORE severe discontinuities. Level 8 represents the most porosity, not the least.
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Discontinuity limits change depending on the wall thickness of the casting. A level of porosity that is catastrophic in a 1/4-inch wall might be acceptable in a 2-inch thick block. How Engineers Establish Acceptance Criteria
standard provides reference radiographs used to evaluate the severity of discontinuities, such as porosity and shrinkage, in aluminum and magnesium castings. David Publishing Discontinuity & Porosity Levels ASTM E155 defines 8 levels of severity
High concentrations of defects. Multiple smaller defects at these levels are difficult to quantify individually. Typical Acceptance Criteria The search for "ASTM E155 porosity levels pdf
Often caused by trapped hydrogen during melting or pouring. ASTM E155 provides images to distinguish between fine, medium, and coarse gas porosity. Gas Holes: Larger, isolated pockets of gas. 3. Application of Levels
Determine if the porosity is in a critical or non-critical area.
: A localized, feathery, or honeycomb-like appearance on the X-ray.
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The grading scale is straightforward: