. Railway mechanical engineer . iron the oxygen from the torch tries to reachthe pure iron, which would readily receive it; i. e., theyhave an affinity for each other, because it was the originalnature of the iron to be united with oxygen and it is theway iron is always found in the earth, i. e., as iron oxideIn cast iron, however, the chemical impurities may interfere,especially the graphitic carbon whose flakes lying betweenthe grains of metal retard the burning, just as for examplesome sheet steel placed between layers of wood would delaythe burning of the wood. Therefore the cutting of cas
. Railway mechanical engineer . iron the oxygen from the torch tries to reachthe pure iron, which would readily receive it; i. e., theyhave an affinity for each other, because it was the originalnature of the iron to be united with oxygen and it is theway iron is always found in the earth, i. e., as iron oxideIn cast iron, however, the chemical impurities may interfere,especially the graphitic carbon whose flakes lying betweenthe grains of metal retard the burning, just as for examplesome sheet steel placed between layers of wood would delaythe burning of the wood. Therefore the cutting of cast iron is inclined to go slowlyand is not as perfect as the cutting of soft steel, which has December, 1922 RAILWAY MECHANICAL ENGINEER 717 less than one per cent of chemical impurities and no graphiticcarbon flakes to interfere. It is quite fXKsible to bring abouta combined burning of the pure iron and melting of theoxide, which undoubtedly is due to the unusually largesupply of oxygen and acetylene used b\- the torch, and to. Fig. 2—Cutting U-ln Steel. Very Little Smoke the additional tire created in the kerf by the excess ofacetjlene. The cutting of cast iron is accompanied with quite somefire and smoke, as shown in Fig. 1. This is caused un-•doubtedly by the burning of the large amount of graphiticcarbon. In comparison there is very little smoke when cut-ting steel (Fig. 2). Effects of Cutting on Cast Iron There is a liberal amount of slag and molten metal fromthe cutting. The kerf is quite a little wider than that of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
