The standard defines five levels of porosity, designated as Levels I to V, with Level I being the lowest and Level V being the highest. The levels are based on the size and distribution of pores within the casting.
The repack process refers to the preparation and packaging of the reference radiographs used in the ASTM E155 standard. The repack process involves:
What specific (e.g., 1/4" or 3/4") or material (aluminum vs. magnesium) matters most to your project?
: Appears as round or elongated dark spots, often minute and distributed throughout the casting.
I can provide tailored acceptance criteria guidelines based on your specific operational needs. Share public link astm e155 porosity levels pdf repack
To ensure that PDF repack is performed effectively, the following best practices should be followed:
: The inspector selects the corresponding ASTM E155 reference plate matching the casting alloy (aluminum or magnesium) and the physical section thickness.
Used for 1/4 and 3/4-inch thicknesses.
Here is a comprehensive guide to understanding ASTM E155 porosity levels, acceptance criteria, and how repackaged PDF documentation is used in modern industrial quality control. What is ASTM E155? The standard defines five levels of porosity, designated
: Further divided into "Feathery" (elongated, streak-like) and "Sponge" (massive, equiaxed) types. Application and Interpretation
These images serve as visual comparators. Inspectors compare production radiographs of castings against these official standards to determine the severity of specific casting flaws. Key Capabilities of the Standard
ASTM E155 is a standard test method that provides a procedure for evaluating the porosity levels of materials using radiography. The test method involves exposing a material to X-rays or gamma rays, which pass through the material and create an image on a radiograph. The radiograph is then analyzed to determine the presence and distribution of pores or voids within the material.
Because a standard PDF or compressed image cannot replicate the pixel depth and dynamic range required for NDT inspection, ASTM created (Standard Digital Reference Radiographs for Inspection of Aluminum Castings). This is the digital equivalent of ASTM E155, consisting of uncompressed, high-bit-depth digital images (often stored in TIFF or DICONDE formats) rather than a simple document text file. 2. The Misconception of "PDF Repacks" The repack process involves: What specific (e
Often, industry users seek digitized versions for convenience in viewing, or "repacks" that compile the charts for quick reference.
Covers sections up to 2 inches (50.8 mm) thick.
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
Acceptable for almost all critical applications, showing little to no detectable porosity.