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The historical development of test blocks is reviewed briefly, leading to the development of the most recent ASTM standards. The large number of test blocks developed by other than ASTM sources is outlined, together with the problems presented by this proliferation of standards.
The current status of ASTM Recommended Practice for Fabricating and Checking Aluminum Ultrasonic Standard Reference Blocks (E 127-75) and ASTM Recommended Practice for Fabrication and Control of Steel Reference Blocks Used in Ultrasonic Inspection (E 428-71(1975)) for flat entry surface standards is discussed, together with the requirements to apply and duplicate the specified calibration procedures.
Current activities of ASTM to improve existing standards are outlined. In conclusion, some requirements for the development of new standards are advanced.
nondestructive testing, ultrasonic tests, calibration, test blocks, standards, aluminum, steels
Director of physics and instrumentation, Reynolds Metal Company, Richmond, Va.