. Electric railway journal . in a crossing frog in Bridgeport. Ifthe break in the web of the rail is not too low inthe surrounding casting, it can be built up by weldingand the missing fragment can be replaced with newsteel to avoid the renewal of the whole piece. Atpresent the bulk of welding in special work lies moreespecially in building up the cups in open-hearth rail,which occur most noticeably on the leaving side ofthe manganese hard centers. Welding Manganese Centers Was Not SuccessfulAttempts to surface-weld such alloys as manganesesteel centers in switches, mates and frogs by the bare
. Electric railway journal . in a crossing frog in Bridgeport. Ifthe break in the web of the rail is not too low inthe surrounding casting, it can be built up by weldingand the missing fragment can be replaced with newsteel to avoid the renewal of the whole piece. Atpresent the bulk of welding in special work lies moreespecially in building up the cups in open-hearth rail,which occur most noticeably on the leaving side ofthe manganese hard centers. Welding Manganese Centers Was Not SuccessfulAttempts to surface-weld such alloys as manganesesteel centers in switches, mates and frogs by the bare-metal-electrode method have not been successful. Sincethe chief characteristics of manganese steel are dueto its heat treatment and manganese content, any ac-tion tending to disturb the effects of the heat treatmentor burn up the manganese is detrimental. The weldingof manganese centers, if done at all by this method,should only be carried out as a last resort in an attemptto secure a temporary repair until a new center is. received. In using thewelding method, thewelded metal on the topof the rail is left a littlehigh and requires grind-ing down to a fine machine which weuse to do the bulk of thisv/ork is the Seymourgrinder as shown herewith. The rotary grind-stone of this is driven bya 3-hp. motor at a speedof 2500 Beforethe method of surface-welding cupped rails be-came general this ma-chine proved valuable forgrinding out the cup ordepression. This, in reality, was merely spreading thelow spot over a greater length of rail. It was doneby first placing the rotary stone at the bottom of thedepression and then offsetting the two wheels eccen-trically on each side. Then by passing the stone backand forth over the depression the shoulders were groundoff to a regular vertical curve of long radius. The first of these machines was bought in 1914 andthere are now five distributed over the various divisionsof our line. The operator of this grinder wears eyeprotect
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
