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The effect of maximum heating temperature on the running quality of liquid metal has been studied for 2 grades of aluminum and an aluminum—8 percent copper alloy. The running quality was measured in terms of the length of a spiral casting obtained by pouring the metal under carefully controlled conditions. The effect of various treatments of the metal was also investigated. It was found that the relation between length of the spiral and the pouring temperature is linear. The running quality of the metals which had been heated to a maximum temperature of 850° C was in all cases less than when the metal had been heated to 750° C. Pure aluminum (99.8 percent) was found to have markedly higher running qualities than the commercial (99.2 percent) aluminum. The running quality of the aluminum—8 percent copper alloy — was not much different from that of commercial aluminum.

Effect of melting conditions on the running quality of aluminum cast in sand molds