Astm E155 Porosity Levels Pdf Repack Better May 2026

ASTM E155 provides standard reference radiographs classifying aluminum and magnesium casting discontinuities into eight severity levels, where Level 1 denotes minimum, and Level 8 maximum, porosity. These levels are utilized for grading castings in acceptance standards such as ASTM B686, which requires specific ratings for Grades B, C, and D. For official standards and technical documents, visit ASTM International www.qgdigitalpublishing.com

The ASTM E155 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 uses a system of eight severity levels (1 to 8) to grade the degree of a discontinuity.

Level 1: Represents the highest quality with minimal, often barely detectable porosity.

Level 8: Indicates the highest concentration or largest size of the discontinuity.

Categories: Discontinuities are grouped into categories such as Category A (Gas Porosity), which includes both round and elongated types. Summary of Porosity Acceptance (Typical) astm e155 porosity levels pdf repack

Engineering drawings often specify an "Acceptance Grade" (e.g., Grade A, B, C, or D) that correlates to these ASTM E155 levels for different casting sections. Discontinuity Type Grade B (High) Grade C (Medium) Grade D (Low) Gas Porosity (Round) Gas Porosity (Elongated) Gas Holes Shrinkage Porosity

Note: For Grade AA, typically no discontinuities are permitted. Guide to Using ASTM E155 Radiographs

ASTM E155 Discontinuity Levels Guide | PDF | Materials - Scribd

I’m unable to provide a meaningful review of "astm e155 porosity levels pdf repack" because this phrase suggests an unofficial or modified version of a copyrighted ASTM standard.

Here’s why you should be cautious:

• ASTM E155 is a standard reference radiograph for aluminum and magnesium castings, used to detect porosity and other discontinuities. The official document is copyrighted by ASTM International.
• “Repack” typically means someone has recompressed, modified, or removed protection from a PDF — often illegally. Repacked PDFs may contain malware, altered reference images, or incorrect porosity level scales.
• Using an unauthorized repack could lead to non‑conforming inspection results if the images or acceptance criteria differ from the official standard.

Introduction

In the world of non-destructive testing (NDT) and casting inspection, few standards are as critical as ASTM E155. This standard governs the reference radiographs for inspection of aluminum and magnesium castings. For quality assurance managers, NDT technicians, and foundry engineers, understanding the specific porosity levels defined by this standard is non-negotiable.

However, finding a clean, organized, and usable version of the documentation—often referred to as an "ASTM E155 porosity levels PDF repack" —has historically been a challenge. Raw PDFs from standards bodies can be dense, unsearchable, or cluttered with legalese.

This article serves as a complete breakdown of ASTM E155 porosity levels, why a "repack" of this PDF is valuable, and how to interpret the radiographic severity levels for production quality control.

Step 1: Identify the Alloy and Thickness

Your component wall thickness determines which reference radiograph to use. ASTM E155 provides separate plates for:

• Aluminum (0.25 inches / 6.35 mm thickness)
• Magnesium (various thicknesses)

Note: If your wall thickness differs from the reference, you must use the "penetrameter sensitivity" or equivalent thickness tables found in the repacked appendix. ASTM E155 is a standard reference radiograph for

How to Use an ASTM E155 Porosity Levels PDF Repack

Even with the best repack, you need a proper procedure. Follow these steps:

Mistake #1: Confusing Gas Porosity with Sponge Shrinkage

• Gas porosity is round and smooth-edged. It comes from dissolved hydrogen.
• Sponge shrinkage is angular and branched. It comes from poor thermal gradient.

Alternative: NDT Training Providers

Some NDT training schools offer study guides that include extracted, annotated versions of ASTM E155 porosity levels for educational purposes. These are not full standards but can serve as a quick-reference repack.

📊 Inside the Porosity Repack

This summary document condenses the visual data you actually need for porosity grading. It breaks down the two main types of gas porosity you encounter in light alloy castings:

1. Rounded Porosity (Gas Holes)

• Appearance: Spherical, smooth-walled dark spots.
• Cause: Usually evolved gas during solidification or moisture in the mold.
• The Grading: The repack visualizes the progression from Degree 1 (minute, scattered) to Degree 4/5 (coarse, dense clustering).
  • Key Takeaway: Class A aerospace parts generally require Degree 1 or 2. Degree 4 is almost always a reject for structural parts.

2. Elongated Porosity (Pinholes / Wormholes) Introduction In the world of non-destructive testing (NDT)

• Appearance: Linear, tube-like dark indications.
• Cause: Solidification shrinkage or gas evolution in a specific direction (often perpendicular to the mold face).
• The Grading: Shows the density and length of the elongation.