. Railway mechanical engineer . ozzle plugged up and two cir-cular discs of sheet iron cut out just large enough to fit in-side the cylinder and valve chamber studs. The edges ofthe broken cylinder and the broken parts were chamferedto an angle of 45 deg., being drilled and tapped on the in-side to receive ^-in. tap bolts. These short tap bolts werescrewed in to within J4 in- of the heads and greatly strength-ened the weld as finally made. A 1/16 in. chip, 1J4 in-wide, was also taken externally all around the break, sothere would be no difficulty in tinning the casting. Thebroken pieces were t
. Railway mechanical engineer . ozzle plugged up and two cir-cular discs of sheet iron cut out just large enough to fit in-side the cylinder and valve chamber studs. The edges ofthe broken cylinder and the broken parts were chamferedto an angle of 45 deg., being drilled and tapped on the in-side to receive ^-in. tap bolts. These short tap bolts werescrewed in to within J4 in- of the heads and greatly strength-ened the weld as finally made. A 1/16 in. chip, 1J4 in-wide, was also taken externally all around the break, sothere would be no difficulty in tinning the casting. Thebroken pieces were then welded together and set in place,being tacked to the cylinder at four places. With these initial preparations, an oil torch was appliedfirst in the big cylinder and then in the valve chamber, burn-ing slowly for about 10 min. in each. The circular sheetiron discs were applied, being held in place by four nuts, andthe torch inserted through the back head pf the cylinder,burning slowly. In about an hours time the cylinder was. Cylinder Before and After Welding with Tobin Bronze too hot to touch and the flame was then reduced, being al-lowed to burn slowly while the weld was made. The weldacross the bottom was completed by one man and two wereused to weld the two sides at the same time until they hadwelded nearly to the top. The weld was completed by oneoperator as shown in the right section of the illustration andcovered up with asbestos, the torch being removed from theback head and the hole plugged up. In the morning thecylinder was cool and when the motion work had been re-applied, the locomotive was returned to service. In welding cast iron with bronze, the method is to heat alittle place on the casting about \l/> in. long and put a thincoating of bronze over it similar to the method of tinningparts before soldering them. The casting is tinned from 1to \l/2 in. ahead of the weld, and by using this method, agood strong weld is obtained. About 75 lb. of Tobin bronze was
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
