Get the length, and then take the part of broken plate which is easiest to handle, and upset it suitable for welding. Make a piece of iron | in. wide, quite thin at one edge, leaving the other about 3/8 in. thick, something like a razor - blade. Take a welding heat on the part that has been upset, and weld the iron across, having the thick end on the point of the plate. Scarf it for welding, upset the other part of plate, and scarf it so that when welding the piece of iron comes between the two steels. In the first heat - it cannot be done in one - don't strike too hard at first, and thin down any thick edges of the scarfs. Take a second heat, and the result will be, in the hands of an average smith, a good sound weld. If the steel is at all fiery, do not attempt to weld it. Should there be a hole near the broken place, showing, on being heated, any sign of a flaw, make a new plate. The piece of iron welded between facilitates the welding, and also makes up for the length lost in jumping.
The Chinese process of welding cracked iron wares by cementing them with molten iron is thus described:- In the case, for example, of a cast - iron pan requiring such treatment, the operator commences by breaking the edges of the fracture slightly with a hammer, so as to enlarge the fissures, after which the fractured parts are placed and held in their natural positions by means of wooden braces; the pan being ready, crucibles made of clay are laid in charcoal and ignited in a small portable sheet - iron furnace, with bellows working horizontally. As soon as the pieces of cast - iron with which the crucibles were charged are fused, the metal is poured on a layer of partly charred husk of rough rice, previously spread on a thickly - doubled cloth, the object of this being to prevent the sudden cooling and hardening of the liquid metal. While in the liquid state, it is quickly conveyed to the fractured part under the vessel, and forced with a jerk into the enlarged fissures, while a paper rubber is passed over the obtruding liquid inside of the vessel, making a neat, strong, substantial, and in every respect thorough operation.