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Magnetic particle testing can hardly be called a new method of inspection. The application of the method has, however, increased by leaps and bounds in a relatively small number of years. In a great number of industries where ferrous metals are vital, magnetic particle testing is now utilized widely both for locating incipient defects in parts in service and as an inspection tool applied for the acceptance of new material. Another use for this very versatile test is as a qualification test for the very high quality of steel which goes into aircraft construction. As with any new test, there has been with magnetic particle testing a wide difference of opinion both with regard to methods of application and to interpretation of results. Within the year preceding this meeting the attempt has been made to formulate standards for the application of the test to castings and to forgings. The wide interest in the test itself, together with the divergent thought concerning its application and interpretation, were made apparent by the meetings of the committees gathered together to formulate standards. Considerable discussion was necessary before methods could be arrived at for inclusion in the 1944 Book of A.S.T.M. Standards. The tentatives which have now been issued will go a long way towards bringing about mutual understanding of the problems of the application of the test. The interpretation of the results and the arrival at standards of acceptance are still left to be handled individually in each contract as it is made.
Schaefer, A. O.
Chairman of Symposium and Executive Metallurgical Engineer, The Midvale Co., Philadelphia, Pa.