. The Street railway journal . between which theweld is made. The secondary winding is so made as to entirelyinclose the primary coils, which are insulated in oil. On each sideof this transformer and supporting it, but insulated from it, are thetwo large levers, hinged together at about two-thirds the distancefrom the top, for transmitting the necessary pressure to the weld. These levers are connected at the top by an hydraulic jack. Ahand pump for forcing water into the jack is bolted to one of thelevers. A pressure of 4100 lbs. per square inch is obtained on the3js-in- diameter rams of the j
. The Street railway journal . between which theweld is made. The secondary winding is so made as to entirelyinclose the primary coils, which are insulated in oil. On each sideof this transformer and supporting it, but insulated from it, are thetwo large levers, hinged together at about two-thirds the distancefrom the top, for transmitting the necessary pressure to the weld. These levers are connected at the top by an hydraulic jack. Ahand pump for forcing water into the jack is bolted to one of thelevers. A pressure of 4100 lbs. per square inch is obtained on the3js-in- diameter rams of the jack, the leverage on the arms increas-ing this so that about 37 tons pressure is developed at the weld. In making a joint, flat-rolled steel bars are used, having ateach end a boss, or projection, on one side, which form the contactpoints between the bars and the web of the rail and confine thewelded area to these sections. A flat strip of steel Y% in. thick by1 in. wide is placed across the middle of the bars on the same side. FJG. CAR, CAST WELDING IN MILWAUKEE storage of air and a bin for holding a supply of sand. A sandmixer of the Tilghman type is also provided. By means of a hoseand nozzle the operator directs the blast of air carrying the sandagainst the rail until all foreign matter has been removed. Thebars are similarly treated and the joint is ready for the actualoperation of welding. The apparatus for welding is carried in two cars coupled togetherby a special form of slip coupling, which permits of sufficient rangeof movement for the car carrying the welder proper to be movedfrom one weld to another of the three welds necessary in makinga joint without the necessity of moving the second car. The welderitself is hung from a bail on a crane extendnig out beyond the end with the bosses. The bars are supported on small blocks and placedacross the joint so that the middle strip engages the web of bothrails. The middle weld is a vertical one and made the full
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
