the metal requires reheat-ing, but it soon becomes evident when the metal becomestoo cold as it will give a decided ring and will probablycrack. It is essential that a temperature of 788 deg. Fahr.should not be exceeded otherwise cracks will be caused. The final heat treatment of droj) forgings… … Fig. 7—Rough duralumin forging. Fig. 8—Fin-ished forging for Cadillac hood catch. Fig. 10—Airplane throttle control in which the bolt andwing nut are duralumin forgings and the springand other jmrts are made from sheet rolled fromthe same alio]/ Figs. 7 and 8 show an adaptation of duralumin to…
Automobiles · Aeronautics
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