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It is not the purpose of this paper to duplicate information now available in recent publications of our Society. There is much useful information, for example, in the two A.S.T.M. Tentative Methods: Methods of Magnetic Particle Testing and Inspection of Commercial Steel Castings (A 272-44 T), and Methods of Magnetic Particle Testing and Inspection of Heavy Steel Forgings (A 275-14 T). A very informative pamphlet “Magnetic Particle Testing of Commercial Forgings” has been published by the Forging Manufacturers' Association. These publications cover such phases of the inspection as application, surface preparation, magnetizing equipment, powders, methods of magnetization, current required for production of suitable magnetic field strength, application of powders, interpretation and reporting of results, demagnetization, etc. Included in these articles are comments on the various conditions which may be developed by the magnetic particle test such as tears and cracks, inclusions, shrinkage, blow holes, chills and chaplets, scabs, sand, cold shuts, and abnormal indications sometimes found in steel castings. Reference is also made to cracks, seams, laps, thermal checks, pipe, bursts, inclusions, segregation, flow lines, and abnormal indications in the use of this testing method on forgings.
Spooner, A. P.
Metallurgical Engineer, Bethlehem Steel Co., Inc., Bethlehem, Pa.