Treatment and casting of metals by electromagnetic forces

THIS paper discusses certain methods developed some years ago employing electromagnetic forces for treating and casting metals.^1,2 The method of treatment is considerably more effective than any other internal-force action so far used for impurity elimination in metals. The electromagnetic forces used in the molten metal produce an effect equivalent to increasing its density many times without change in the density of the impurities. Other effects produced in the metal are an effective overcoming of viscosity, even in those metals noted for a high degree of viscosity, and a temperature gradient enabling progressive solidification in the direction of travel of the impurities to the surface.