. The Iron and steel magazine. the Dunham Towing ^ Wrecking Com-pany, the rudder shoe of the tugboat Sckenck was welded, 125pounds of Thermat being used. The weld was sound — in re]-lac-ing the propeller a chain broke and the propeller dropped on thewelded shoe without injuring it. Some im];ortant repairs of gray iron castings are also re-ported. At the Renovo shops of the Pennsylvania Railroada hydraulic wheel press was repaired, the part welded havingto stand a pressure of 60 tons per square inch. The origuial strong back holding the wheel against which the axle was 77/r llicruiii Process in
. The Iron and steel magazine. the Dunham Towing ^ Wrecking Com-pany, the rudder shoe of the tugboat Sckenck was welded, 125pounds of Thermat being used. The weld was sound — in re]-lac-ing the propeller a chain broke and the propeller dropped on thewelded shoe without injuring it. Some im];ortant repairs of gray iron castings are also re-ported. At the Renovo shops of the Pennsylvania Railroada hydraulic wheel press was repaired, the part welded havingto stand a pressure of 60 tons per square inch. The origuial strong back holding the wheel against which the axle was 77/r llicruiii Process in Aiucrican Practice 219 pressed was not stroni]: cnoiuj:h for the jnirpose until repaired by Thermit. Cyhnder eovers are also repaired by Thermit and have been made as good as new. Work with gray iron castings requires more experience, inregard to pre-heating and cooling down gradually — moreThermit is necessary to effect the weld, on account of a hard,<:ylassv scale on such castings, which resists fusion, and an addi-. Weld of q-in. Rudder Stock tion oi fern^-silicon (about 2%) is advisable to prevent hardspots at the lines of junction between Thermit steel and cast most important application of the Thermit process isfor making a continuous rail. The process having been broughtto a high state of perfection in Europe before coming here, therewas little room for changes in practice. About 30 differentcities are investigating the process in actual operation and about5,000 joints have been put in up to date. All roads recog- 220 The Iron and Steel Magazine nize in the Thermit process the best and simplest means of join-ing rails for electric traction, as long as care is taken to do smalland things right. Competitors in the field of rail weldingmay send out fanciful blue-prints about broken joints, to createunfavorable impressions, but such manoeuvers prove nothingbeyond the fact that they admit the success of the Thermit pro-cess in this field. Some
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
