. Electric railway journal . 0 lb. 1 in. X 7 in. rolled steel plates 30 acetylene I , , 90 100 oxygen ( ^^r cuttmg 1,30 New switch tongue $ Actual saving by electric welding $ The top and inside edges of the plates were built upwith steel by means of the electric arc, until the headof the rail was brought back to normal. For a depthof approximately 1 in. from the top a layer of specialhard grade steel was used. Where the rail was wornbut not broken the surface was built up with mild andhard steel, until, after grinding, all sections werebrought back to the
. Electric railway journal . 0 lb. 1 in. X 7 in. rolled steel plates 30 acetylene I , , 90 100 oxygen ( ^^r cuttmg 1,30 New switch tongue $ Actual saving by electric welding $ The top and inside edges of the plates were built upwith steel by means of the electric arc, until the headof the rail was brought back to normal. For a depthof approximately 1 in. from the top a layer of specialhard grade steel was used. Where the rail was wornbut not broken the surface was built up with mild andhard steel, until, after grinding, all sections werebrought back to their original dimensions. No attemptwas made to weld the switch tongue. It was simplyreplaced with a new one. The switch casting was made lose its hardness on tempering until heated above adull red heat. This valuable property explains its greatsuperiority over carbon steels, which begin to losehardness appreciably on tempering at 200 deg. C, whilefor high speed steel this loss does not occur until about700 deg. C. is PORTABl^E TWO ARC ELECTRIC WELDING MACHINEUSED BY THE NEW YORK RAILWAYS by the Lorain Steel Company. The center section ofthe rail is of manganese steel and is keyed into the steelcasting. The writer was informed that this is only one of anumber of cases where the use of electric arc weldinghas saved the company considerable money and length-ened the life of equipment. At some crossings the com-pany has replaced worn and broken manganese hardcenters with special forged tool steel plates, arc weldingthe plates in place. At another location where a longsection of the rail had been broken out, and where theexpense of removing the pavement to replace the xailwould make its replacement costly, it was found thatwith the aid of the arc it was able to graft a new sectionof rail in place without disturbing the pavement to anygreat extent, consequently adding another achievementto its credit. High-Speed Tool Steel MODERN high-speed tool steel is a high alloy, theess
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