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EFFECTS OF GATING PRACTICE ON LEAK TIGHTNESS OF 85-5-5-5 AND 81-3-7-9 ALLOY CASTINGS

2244
Journal: Transactions of the American Foundrymen's Society V 60 P 287-295, 1952 (9 p)
Author: Kura, J G and Eastwood, L W

Foundrymen will universally agree that gating practice is an important aspect of foundry operation. There is, however, no universal agreement regarding the best method which should be employed to gate the castings. Recent studies 1< * sponsored by the American Foundrymen's Society have shown that turbulence and air aspiration must be carefully avoided if sound castings of reactive metals are to be produced. On the basis of this work, it appeared that it would be more desirable to gate experimental leak-test cast ings at the bottom in order to avoid the turbulence which would occur if the melt was introduced at the top of the mold cavity. This, however, differed from some commercial practices. Accordingly, an investi gation was undertaken to compare the effects of gating practice on the leak tightness of 85-5-5-5 and 81-3-7-9 alloys. Incidentally, the effects of pouring temperature and melting practice were also determined, and a comparison was made of the relative susceptibilities of the two alloys, 85-5-5-5 and 81-3-7-9, to leakage. This paper describes the results obtained in this in vestigation.



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