Systamatic Radiography Welds

Home - Education Resources - NDT Course Material - Radiography

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Introduction to Radiographic Testing
Introduction
History
Present State
Future Direction
References
Physics of Radiography
Nature of RT
Inverse Square Law
Decay Rate
-Carbon 14 Dating
Interaction of RT/Matter
Compton Scattering
- Klein-Nishina Formula
Absorption
Geometry/X-ray Res
Filters in Radiography
Scatter/Radiation Control
Radiation Safety
Equipment & Materials
X-ray Sources
Radio Isotope Sources
Radiographic Film
Exposure Vaults
Techniques & Calibrations
Imaging Consideration
Film Processing
Viewing Radiographs
Contrast & Definition
Radiographic Density
Controlling Quality
Exposure Calculations
Radiograph Interp-Welds
Radiograph Interp - Castings
Advanced Techniques
Real-time Radiography
Computed Tomography
XRSIM
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Radiograph Interpretation - Welds
In addition to producing high quality radiographs, the radiographer must also be skilled in radiographic interpretation. Interpretation of radiographs takes place in three basic steps which are (1) detection, (2) interpretation, and (3) evaluation. All of these steps make use of the radiographer's visual acuity. Visual acuity is the ability to resolve a spatial pattern in an image. The ability of an individual to detect discontinuities in radiography is also affected by the lighting condition in the place of viewing, and the experience level for recognizing various features in the image. The following material was developed to help students develop an understanding of the types of defects found in weldments and how they appear in a radiograph.
Discontinuities
Discontinuities are interruptions in the typical structure of a material. These interruptions may occur in the base metal, weld material or "heat affected" zones. Discontinuities, which do not meet the requirements of the codes or specification used to invoke and control an inspection, are referred to as defects.
General Welding