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A particularly fitting observation about this symposium is the wide diversity of applications to which magnetic particle testing is applied, as indicated by the various papers given and the range of interests represented. In view of this fact it seems worth while for the benefit of those not familiar with practice in aircraft work to describe in greater detail than would otherwise be suitable the type of parts involved in the discussion to follow and some of the fabricating methods used. My discussion is primarily from the standpoint of one who is engaged in the manufacture and fabrication of drop forgings for aircraft and the drop forged parts commonly referred to as engine parts, such as crankshafts, connecting rods, crankcases; propeller parts such as blades, hubs, and component parts; and landing gear parts. Also may be included some of the airplane connections, and parts in some of the auxiliaries, such as fluid pressure systems, etc. Those parts are forged in closed dies. They are almost universally forged from electric furnace steel, produced under stringent requirements for nonoccurrence of nonmetallic materials. As used, this steel will have a minimum of center porosity, a minimum of stringers, and while there will be banding present, it will not be excessive.
Dixon, E. O.
Chief Metallurgical and Mechanical Engineer, Ladish Drop Forge Co., Cudahy, Wis.