This experiment was carried out to see how the molten metal flow and fill the sand mould. Fine wire of high electric resistance was inserted in mould space, and let the metal flow along this wire. The metal flow brings the change of wire resistance which can be recorded on a rotating drum using Braun tube oscillograph. For Al sand casting the results are as follows :
(1) Velocity of molten Al in sand is a little affected by moisture, and is largest at 9% moistedsand. (2) The velocity is largest when casted at 750°. (3) In ordinary case, flow of metal is affected by the dimensions of runner and gate. (4) Riser leads the metal faster and more uniformly, and without riser, the metal flow is affected by packing of sand. (5) Bended runner loses the metal velocity according to its bending angle.
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