Used for 1/4 and 3/4-inch thicknesses.
ASTM E155 Discontinuity Levels Guide | PDF | Materials - Scribd
is a set of radiographic reference radiographs (photographic prints) that illustrate various types and severities of discontinuities (defects) found in aluminum and magnesium alloy castings. These radiographs serve as a standard for comparing the image of a production casting to determine its acceptability. Key Applications
The most authoritative source is ASTM International directly. Reference radiographs for E155 inspection (Volume I) are available as adjunct RRE015501, which includes 13 plates covering discontinuities in aluminum-alloy castings and 10 plates for magnesium-alloy castings. astm e155 porosity levels pdf repack
ASTM E155 is a standard developed by ASTM International. Its official title is Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings .
Often, industry users seek digitized versions for convenience in viewing, or "repacks" that compile the charts for quick reference.
ASTM E155 is a collection of reference radiographs (X-ray images) used to evaluate the severity of discontinuities—commonly known as defects—in castings. These are not "pass/fail" rules on their own; instead, they serve as a visual yardstick that manufacturers and purchasers use to agree on what level of porosity is acceptable for a specific part. 分析测试百科网 The 8 Levels of Severity The standard classifies discontinuities into 8 levels of severity Used for 1/4 and 3/4-inch thicknesses
For high-strength aluminum applications, ASTM E155 Level 1 specifically sets the limit for single pore diameter within a narrow range of ≤ 0.5 mm.
For a typical , you will find 5 distinct severity levels illustrated for each type of porosity. Here is what each level represents in practical terms:
Round, distinct cavities caused by trapped gas (usually hydrogen) during solidification. Key Applications The most authoritative source is ASTM
These appear as round or elongated, smooth-edged dark spots on the radiograph. They can occur individually, in clusters, or distributed throughout the casting.
In the context of ASTM E155, porosity is generally categorized by how it appears on a radiograph.
Gas porosity appears on a radiograph as distinct, round, or elongated dark spots. It is usually caused by hydrogen gas trapped in the molten metal.