(Note: These are illustrative – actual values vary by thickness.)
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.
Used for 1/4 and 3/4-inch thicknesses.
Engineering drawings often specify an "Acceptance Grade" (e.g., Grade A, B, C, or D) that correlates to these ASTM E155 levels for different casting sections. Discontinuity Type Grade B (High) Grade C (Medium) Grade D (Low) Gas Porosity (Elongated) Gas Holes Shrinkage Porosity
ASTM E155 uses a system of (1 to 8) to grade the degree of a discontinuity. astm e155 porosity levels pdf repack
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
ASTM E155 has been updated over time (e.g., E155-00, E155-15, E155-20), and a repack might indicate the latest version, including digital reference radiographs (E2422). Importance of Proper Interpretation (Note: These are illustrative – actual values vary
A very specific request!
A: ASTM E155-20 is the most recent active version as of this writing. Engineering drawings often specify an "Acceptance Grade" (e
While distinct from isolated gas porosity, microshrinkage is an interconnected network of tiny voids caused by a lack of molten metal feeding into the casting as it shrinks during cooling. It appears on radiographs as feathery or sponge-like dark patterns and is graded heavily because it severely impacts the mechanical integrity of structural parts. 3. Foreign Inclusions These are divided into: