. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . r the manganese or the siliconin rather high amount. Sometimes thesilicon goes up as high as per is much more than steel ordinarilycontains. The purpose is, as said, to avoidthe creation of blow holes. Crucible steelcontain a smaller percentage of silicon,although, even with it. the amount of sili- con may be fairly considerable. In short,then, when one has to do with steel cast-ings, he has to do also with silicon. This^ubstance is a chemical element whichmelts at about 2,588 d
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . r the manganese or the siliconin rather high amount. Sometimes thesilicon goes up as high as per is much more than steel ordinarilycontains. The purpose is, as said, to avoidthe creation of blow holes. Crucible steelcontain a smaller percentage of silicon,although, even with it. the amount of sili- con may be fairly considerable. In short,then, when one has to do with steel cast-ings, he has to do also with silicon. This^ubstance is a chemical element whichmelts at about 2,588 degrees F., which issomewhat lower than the melting point oflow carbon slecl. But, it is not so muchwith its melting point that one has toreckon in welding with the oxy-acetyleneflame. The hot spot is understood tohave a tem|>erature of some 5,500 should not surprise us then, perhaps,if silicon is vaporized when the hot spotis brought to bear upon cast steel. I donot know the exact temperature at whichsilicon vaporizes. The Smilhsonian Physi-cal Tables omit silicon from the list where. \ IKW OF HE.\VY STEEL CASTINGAFTER WELDING. the information would be found. Onemay, however, consider it as fairly certainthat, when one has to weld work consist-ing of cast steel, more or less silicon willvaporize and be lost. This is perhaps notas important as the consideration thatsilicon must certainly be lost from thenew material put into the groove to makethe w-eld. It is to be reckoned good practice touse the same material to fill the grooveas that which is in the work. One writersuggests that in cutting out material toform the groove the pieces be saved foruse ill the welding operation. Nay, heeven suggests that at times surplus metalmight be cut off from other parts of thework. .Another writer suggests thatsmall cast bars of the same metal asthat in the work be employed. However,pure iron (such as Swedish soft iron)may be used as filling material, and so also may cast iron.
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