: The inspector places the production radiograph side-by-side with the corresponding ASTM E155 reference chart for that specific thickness and material.
Understanding how porosity levels are classified, what a "repack" documentation implies, and how to utilize PDF reference charts is essential for maintaining strict structural integrity. What is ASTM E155?
: Spherical voids distributed randomly or in clusters.
It provides a common language between the casting supplier and the purchaser regarding defect acceptance. Conclusion astm e155 porosity levels pdf repack
Indicates an increasing size, volume, and concentration of gas pores or microshrinkage. These levels are common for general industrial machinery and automotive components.
: Interconnected lines or cavity networks following the crystalline structure of the metal. 3. Severity Levels (1 through 8)
Result of larger gas pockets or localized localized shrinkage where feeding liquid metal was restricted. : Spherical voids distributed randomly or in clusters
: The assigned level is compared against the project’s blueprint or engineering specifications (e.g., "Max allowable porosity: Category A, Level 3"). Technical Specifications Matrix Defect Category Common Cause Radiographic Appearance Typical Acceptance Limit (Aerospace) Typical Acceptance Limit (Commercial) Gas Porosity (Round) Hydrogen gas entrapment Small, dark, distinct circles Level 1 or 2 Level 4 or 5 Gas Porosity (Elongated) Turbulent mold filling Oval or irregular dark shapes Level 3 or 4 Sponge Shrinkage Inadequate feeding during cooling Diffuse, dark, cloudy patches Level 1 or 2 Level 3 or 5 Dendritic Shrinkage Slow cooling rates Branching, tree-like dark lines Understanding Document Distribution: PDFs and "Repacks"
: Caused by trapped gas (often hydrogen in aluminum).
Understanding ASTM E155 Porosity Levels: A Guide to Radiographic Inspection and Evaluation These levels are common for general industrial machinery
The inspector assigns a grade based on which reference plate most closely matches the severity of the porosity in the produced part. What is the "ASTM E155 Porosity Levels PDF/Repack"?
Jagged, angular voids caused by metal contraction during solidification. Foreign material: Inclusions of lighter or heavier density.
Historically, ASTM E155 was distributed as physical film or large, high-quality prints enclosed in a binder. This ensured that the interpreter was viewing the image with the exact resolution and dynamic range intended by the standards committee. However, as the industry transitioned to Digital Radiography (DR) and Computed Radiography (CR), the need for digital reference standards became urgent.
When looking for , users are often searching for a "repack," "reissue," or a digital PDF version of the reference radiographs. Why search for a repack?
For specific defects like "Aluminum Foreign Material (More Dense)" at 3/4" thickness, the standard quantifies levels by area and diameter: m m squared the empty set m m squared the empty set m m squared the empty set m m squared the empty set m m squared the empty set
