Where To Use Radiography
Basic Guidelines. There are some basic guidelines that may be used to determine situations to which radiography is applicable.
- The defect, which is of interest, must cause a detectable change in apparent thickness, density or composition of the test material.
- The material should be reasonably homogeneous, so that an indication of a defect may be recognized.
- The configuration of the part to be tested, or the area that surrounds it, must be such that access to both sides is available.
- The defect to be detected must be properly oriented in the path of the radiation beam.
Limitations. Radiography is not a cure-all and should be used only when the above conditions are satisfied. Multiple film techniques and other special methods, which will be covered in Section V, make radiography a versatile tool for material evaluation.
Typical Examples.
- Radiography is a useful nondestructive inspection method for detecting internal discontinuities in many materials.
- Radiography may be applied to the inspection of castings, welds, and assembled components. Various metals, both ferrous and nonferrous, as well as non-metallics, such as ceramics and plastics, can successfully be inspected.
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