. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . con-ceded by all concerned to be the best ma-terial for boiler tubes. February, 1921 RAILWAY AND LOCOMOTIVE ENGINEERING 39 Repairing An Air Compressor At the Shops of the Erie Raihoad, Susquehanna, Pa. The cuniiectiiig-rod of an air com-pressor, one of two units operated by theErie Railroad shops, Susquehanna, Pa.,for supplying air pressure to the pneu-matic tools used for boiler caulking, chip-ping boiler plate, etc., recently snapped intwo. causing one end of the rod to flyaround into a wed
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . con-ceded by all concerned to be the best ma-terial for boiler tubes. February, 1921 RAILWAY AND LOCOMOTIVE ENGINEERING 39 Repairing An Air Compressor At the Shops of the Erie Raihoad, Susquehanna, Pa. The cuniiectiiig-rod of an air com-pressor, one of two units operated by theErie Railroad shops, Susquehanna, Pa.,for supplying air pressure to the pneu-matic tools used for boiler caulking, chip-ping boiler plate, etc., recently snapped intwo. causing one end of the rod to flyaround into a wedged position and exert-ing such a strain on the machine that thehollow cast-iron back frame of the bedplate broke oflf. The cross section of the hollow castingat the fracture measured about 8x6in. at this point, the thickness of two op-posite walls being 3 in. the other two op-posite walls only A in. A new bed plate was ordered, but it wasimpossible to get it delivered before 60days. As the idleness of this air com-pressor cut down the compressed air sup-ply over all the shops 50 per cent, the op-. FIG. 1. BROKEX SECTIONS OF CAST IRON AIR COMPRESSOR BACK FRAME LINED UP FOR WELDING. erators decided to repair it by means ofThermit welding. In welding the cast-ing the bed plate was laid on its side, asshown in Fig. 1. The broken sections ofthe casting were then lined up by meansof bolted straps, as shown, a small gapbeing left between the two sections to pro-vide space for the Thermit steel later toenter. Yellow pattern wax was then insertedin the space and a mold formed aroundthe wax. A preheating torch was directedinto the mold for the purpose of dryin,:;out the mold, preheating the sections tobe welded and burning out the patternwax. Finally when everything was ready tomake the weld 30O lbs. of Cast Iron Ther-mit, a mixture of iron oxide and alumi-num, to which was added 3 per cent FerroSilicon 50/50 per cent and 20 per centmild steel punchings, were ignited in acrucible suspen
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