. Electric railway journal . FINISHING OPERATIONS AFTER WELDING REPAIRS HAVE BEEN MADE Fig. 8—Crucible in Place Ready for Making the 9—Cleaning Off Sand from Casting. Fig. 10—Trimming Off Gates and Riser with Oxy-acetylene Torch. fall into the mold. After the patterns are withdrawnthe various openings should be covered and the crucibleset up, with the bottom about 3 in. above and directlyover the pouring gate. Preheating Is Essential The parts to be welded must be brought up to agood, red, workable heat, and the mold should be driedout thoroughly. The Metal & Thermit Corporation hasd
. Electric railway journal . FINISHING OPERATIONS AFTER WELDING REPAIRS HAVE BEEN MADE Fig. 8—Crucible in Place Ready for Making the 9—Cleaning Off Sand from Casting. Fig. 10—Trimming Off Gates and Riser with Oxy-acetylene Torch. fall into the mold. After the patterns are withdrawnthe various openings should be covered and the crucibleset up, with the bottom about 3 in. above and directlyover the pouring gate. Preheating Is Essential The parts to be welded must be brought up to agood, red, workable heat, and the mold should be driedout thoroughly. The Metal & Thermit Corporation hasdeveloped a preheater for this purpose which operateswith compressed air and either gasoline or is recommended for fuel, as it gives a clean,hot flame, with no deposit of carbon. Cleanliness isessential to insure satisfactory results in welding, andeven a small deposit of carbon may prevent completefusion. This type of preheater is fitted with eitherone or two burners as desired, and the needle val
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