Astm E155 Porosity Levels Pdf Repack

Massive, equiaxed voids with a sponge-like appearance. The Eight Levels of Severity

ASTM E155 porosity levels represent a cornerstone of quality assurance for aluminum and magnesium castings across industries worldwide. Understanding the eight-grade severity system, the distinction between film and digital applications, and the proper methods for obtaining legitimate documentation is essential for any NDT professional.

ASTM E155 is a standard developed by ASTM International that consists of reference radiographs (X-ray films or digital images) illustrating various types and degrees of discontinuities occurring in aluminum and magnesium castings. astm e155 porosity levels pdf repack

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

Dense, clustered, or large voids. Generally not acceptable for aerospace or pressurized parts. Discontinuity Grades and Levels Massive, equiaxed voids with a sponge-like appearance

If an engineer uses a low-resolution "repack" to judge a critical aerospace component, they risk accepting a part with dangerous levels of porosity or rejecting a perfectly good part, leading to financial waste. The term "repack" implies that the data has been handled or manipulated by a third party, severing the chain of custody regarding the document's authenticity. Unlike a physical film or a DRM-protected official file, a "repack" offers no guarantee that the image hasn't been altered, brightened, or cropped, rendering it invalid for contractual use.

The standard provides reference radiographs for inspecting aluminum and magnesium alloy castings. These radiographs serve as a visual baseline for evaluating the severity of internal discontinuities like gas porosity, shrinkage, and foreign materials. Porosity Classification and Severity Levels ASTM E155 is a standard developed by ASTM

For each graded discontinuity type, the reference radiographs provide separate severity plates for both ¼‑inch and ¾‑inch thickness castings. For example, the Gas Porosity (Round) plates for aluminum castings in Volume I include specific designations such as d(P13) for 3/4-inch thickness and c(P7) for 1/4-inch thickness, with eight graded severity levels within each thickness category.