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To Solder Grey Cast-Iron

are too large to be both introduced at the same First dip the castings in alcohol, after which, time into the forge, one can be first heated sprinkle muriate of ammonia (sal-ammoniac) with the welding powder to a cherry-red over the surface to be soldered. Then hold the casting over a charcoal fire till the salammoniac begins to smoke, then dip it into melted tin (not solder). This prepares the metal for soldering, which can then be done in the ordinary way. heat, and the others afterwards to a white heat, after which the welding may be effected. 3524. Welding Composition for Cast Steel. Take borax, 10 parts; sal-ammoniac, 1 part; grind or pound them roughly together, then fuse them in a metal pot over a clear fire, taking care to continue the heat until all