ASNT Level 3 Basic Method Course
ASNT Level 3 Basic Method Course Fees 450 $ | ASNT Level 3 Basic Method Course Exam Fees To be informed | ASNT Level 3 Basic Method Course Duration 20 Days | ASNT Level 3 Basic Method Course Location Muscat
Definition of Nondestructive Testing
Nondestructive testing (NDT) has been defined as comprising those test methods used to examine or inspect a part or material or system without impairing its future usefulness.
The term is generally applied to nonmedical investigations of material integrity.
Strictly speaking, this definition of nondestructive testing does include noninvasive medical diagnostics. X-rays, ultrasound and endoscopes are used by both medical and industrial nondestructive testing. In the 1940s, many members of the American Society for Nondestructive Testing ( then the Society for Industrial Radiography) were medical X-ray professionals. Medical nondestructive testing, however, has come to be treated by a body of learning so separate from industrial nondestructive testing that today most physicians never use the word nondestructive.
ASNT Level 3 Basic Method Course Non destructive testing is used to investigate specifically the material integrity of the test object. A number of other technologies - for instance, radio astronomy, voltage and amperage measurement and rheometry (flow measurement) - are nondestructive but are not used to evaluate material properties specifically.
ASNT Level 3 Basic Method Course covers Nondestructive testing is concerned in a practical way with the performance of the test piece - how long may the piece be used and when does it need to be checked again? Radar and sonar are classified as nondestructive testing when used to inspect dams, for instance, but not when they are used to chart a river bottom.
Non destructive testing asks "Is there something wrong with this material?" Various performance and proof tests, in contrast, ask "Does this component work?" This is the reason that it is not considered nondestructive testing when an inspector checks a circuit by running electric current through it. ASNT Level 3 Basic Method Course Hydrostatic pressure testing is usually proof testing and intrinsically not nondestructive - but acoustic emission testing used to monitor changes in a pressure vessel's integrity during hydrostatic testing is nondestructive testing.
Another gray area that invites various interpretations in defining nondestructive testing is that of future usefulness. Some material investigations involve taking a sample of the inspected part for testing that is inherently destructive. ASNT Level 3 Basic Method Course covers a noncritical part of a pressure vessel may be scraped or shaved to get a sample for electron microscopy, for example.
Although future usefulness of the vessel is not impaired by the loss of material, the procedure is inherently destructive and the shaving itself - in one sense the true "test object" - has been removed from service permanently.
The idea of future usefulness is relevant to the quality control practice of sampling. Sampling (that is, the use of less than 100 percent inspection to draw inferences about the unsampled lots) is nondestructive testing if the tested sample is returned to service. If the steel is tested to verify the alloy in some bolts that can then be returned to service, then the test is nondestructive. In contrast, even if spectroscopy used in the chemical testing of man)'. fluids is inherently nondestructive, the testing is destructive if the samples are poured-down the drain after testing.
Hardness testing by indentation provides an interesting test case for the' definition of nondestructive testing. Hardness testing machines look somewhat like drill presses. ASNT Level 3 Basic Method Course covers the applied force is controlled as the bit is lowered to make a small dent in the surface of the test piece. Then the diameter or depth of the dent is measured.
The force applied is correlated with the dent size to provide a measurement of surface hardness. The future usefulness of the test piece is not impaired except in rare cases when a high degree of surface quality is important. ASNT Level 3 Basic Method Course However, because the piece's contour is altered, the test is rarely considered nondestructive. A nondestructive alternative to this hardness test could be to use electromagnetic nondestructive testing.
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