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Steel-faced Castings

A face of steel may, under favorable conditions, be given to castings in iron, by making the steel red-hot, and placing it within a dry-sand mould. If possible, drop the molten iron immediately over the steel to be welded, by runners sufficient to cover the piece and effect a junction quickly; otherwise the process is rendered inoperative by the metal simply running over it and out at the escape, at a gradually decreasing temperature--just so much waste. A very superior union is always effected when the body of cast iron is large, the steel being under the influence of fluid metal for a less space of time in proportion as the body becomes thinner. Sometimes these junctions are effected, apparently, by forcing a large quantity of molten metal through the mould; but if the steel is not subjected to the abrading influence of a direct fall, it can hardly be expected that a solid weld will be made.