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Cite this document
Inspection of rotor forgings, both turbine and generator rotors, begins in the melt shop. The quality of the finished product reflects the care that is exercised in the selection of scrap, controlled melting practices, accurate temperature control, tapping, and pouring. The design and size of the molds and hot tops also effectively contribute to sound ingots intended for rotor forgings for our electrical industry. The manufacturing plants are all equipped with good instruments and equipment as well as trained metallurgists, technicians, and inspectors who begin inspection from the very inception of a heat of steel for a rotor. As the ingot is poured, much data are recorded in the log of the heat, such as time, temperature, mold condition, pouring rate, and other pertinent information. After stripping and conditioning for forging, the ingot is carefully forged. Here again inspectors constantly check the heating of the ingot and the forging operation and record all data in the log, or history, making certain that the forgings are processed in the manner outlined by the metallurgical and engineering departments. These data are of paramount importance in statistical control in rating mold performance, open-hearth practices, forging practices, and so on. Some rotors are single upset and some are double upset; others are forged with no upsetting.
Danner, George E.
Director of Metallurgy and Research, Erie Forge and Steel Corp., Erie, Pa.