For the uninitiated, ASTM E155 provides the standard reference radiographs for porosity in aluminum (Series I) and magnesium (Series II) castings. The original format is a massive, spiral-bound folio containing actual radiographic film sheets or high-resolution digital images. The “repack” reviewed here refers to a third-party or internally consolidated digital PDF version that has been:
With the rise of Digital Radiography (DR) and Computed Radiography (CR), the NDT industry has shifted toward digital reference standards. This evolution relates directly to terms like "PDF repack" or "digital reference radiographs." 1. Physical vs. Digital Reference Radiographs (ASTM E2422)
Find the that is equal to or worse than your casting's defect. For example:
The standard categorizes the severity of defects using a standardized numbering system, typically ranging from . astm e155 porosity levels pdf repack
ASTM E155 reference radiographs are adjunct materials that —they are not included in the PDF of the standard text. The standard text (typically four pages) describes the scope, significance, and use of the reference radiographs but does not contain the actual radiographic images within the PDF. As the standard states: "The reference radiograph films are an adjunct to this document and must be purchased separately from ASTM International if needed" .
A very specific request!
ASTM E155 is a standard published by ASTM International, providing a set of reference radiographs that illustrate the types and degrees of discontinuities that may be found in aluminum-alloy and magnesium-alloy castings. Think of it as a visual dictionary of defects, serving as a benchmark to answer a critical question: is a defect severe enough to reject a casting? For the uninitiated, ASTM E155 provides the standard
Do you need to compare directly with ASTM E2422 (digital) requirements?
Some guides provide estimations of defect size in mm2m m squared or diameter for various levels.
| Reference Level | Density (D) above base | |----------------|------------------------| | Level 1 | 0.05 – 0.15 | | Level 2 | 0.16 – 0.30 | | Level 3 | 0.31 – 0.50 | | Level 4 | 0.51 – 0.80 | | Level 5 | >0.80 | This evolution relates directly to terms like "PDF
In the world of nondestructive testing (NDT), consistency is king. When inspecting aluminum and magnesium castings for internal flaws, professionals rely on a single gold standard: . This standard governs the reference radiographs for discontinuities—specifically porosity, gas holes, and inclusions.
The levels are relative to a master set of radiographs. You do not guess. You place your production radiograph next to (or digitally overlay) the ASTM reference of the same thickness range and match the severity.
ASTM E155 categorizes casting defects into several categories, including , microshrinkage , and foreign materials . When inspectors refer to "porosity levels" in this context, they are often referring to the severity levels assigned to gas holes and gas porosity. 1. Gas Holes