. Electric railway journal . [NG MOTOR SHELL WELDS WITH THERMIT Fig. 2—A Pile of Broken Motor Shells. Fig. 3—Cutting Out Metal from the Fracture with EleettFig. 4—Broken Motor Shell Lined Up on Surface Plate. Fig. 5-Fig. 6-Fig. 7- -Wax Mold Applied to Break at Axle the Mold and Removing the Riser the Casting. too large they can be closed with pieces of steel in sucha manner as to retain the molding sand properly. Constructing the Mold The facing of the mold, or the part that comes in con-tact with the thermit, should consist of equal parts offire clay, cr
. Electric railway journal . [NG MOTOR SHELL WELDS WITH THERMIT Fig. 2—A Pile of Broken Motor Shells. Fig. 3—Cutting Out Metal from the Fracture with EleettFig. 4—Broken Motor Shell Lined Up on Surface Plate. Fig. 5-Fig. 6-Fig. 7- -Wax Mold Applied to Break at Axle the Mold and Removing the Riser the Casting. too large they can be closed with pieces of steel in sucha manner as to retain the molding sand properly. Constructing the Mold The facing of the mold, or the part that comes in con-tact with the thermit, should consist of equal parts offire clay, crushed fire brick and fire sand. The manu-facturers of thermit supply these materials where theycannot be readily obtained in the immediate vicinity ofthe railway. This mixture should be well riddled, mixeddry and then moistened with just enough water to makeit pack well. It can be used for the entire mold wherethe welds to be made are small, but for welds of thesize necessary on motor shells it is more economical touse
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