ET01.pdf

A conservative inspector may reject parts that

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A conservative inspector may reject parts that contain rejectable discontinuities but the inspector also may reject parts that do not contain rejectable discontinuities, with the result of unnecessary scrap and repair. Neither scenario is desirable. Electromagnetic Testing Standards Traditionally, the purpose of specifications and standards has been to define the requirements that goods or services must meet. As such, they are intended to be incorporated into contracts so that both the buyer and provider have a well defined description of what one will receive and the other will provide. Standards have undergone a process of peer review in industry and can be invoked with the force of law by contract or by government regulation. In contrast, a specification represents an employer’s instructions to employees and is specific to a contract or work place. Specifications may form the basis of standards through a review process. Standards and specifications exist in three basic areas: equipment, processes and personnel. 1. Standards for equipment include criteria that address probes, artificial discontinuities and test results. Reference standards are work pieces that contain artificial discontinuities for instrument calibration and test procedure verification. 2. ASTM International and other organizations publish standards for test techniques. Some other standards are for quality assurance procedures and are not specific to a test method or even to testing in general. Tables 3 and 4 list some standards used in electromagnetic testing. The United States Department of Defense has replaced most military specifications and standards with industry consensus specifications and standards. A source for nondestructive testing standards is the Annual Book of ASTM Standards. 5 3. Qualification and certification of test personnel are discussed below with specific reference to recommendations of ASNT Recommended Practice No. SNT-TC-1A. 6 16 Electromagnetic Testing
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Personnel Qualification and Certification One of the most critical aspects of the test process is the qualification of test personnel. Nondestructive testing is sometimes referred to as a special process. The term simply means that it is very difficult to determine the adequacy of a test by merely observing the process or the documentation generated at its conclusion. The quality of the test is largely dependent on the skills and knowledge of the inspector. The American Society for Nondestructive Testing (ASNT) has been a world leader in the qualification and certification of nondestructive testing personnel for many years. By 1999, the American Society for Nondestructive Testing had instituted three major programs for the qualification and certification of nondestructive testing personnel.
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  • Fall '19
  • The Land, Nondestructive testing, electromagnetic testing

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