. Railway mechanical engineer . omaticthis particular case is very apparent. In instances of this cut-out to stop and start the motor when air pressure riseskind, the ratio between the drive pulleys or gears on the or falls below the desired pressure. The first cost of such in-motor and compressor should be increased in order to de- stallation is higher, but it is a great economy in tlie lont; run. Principles of Oxvacetylene Fusion WeldingPart 6—Welding Cast Iron, Continued By Alfred S. Kinsev* THE five chemical elements in cast iron have their ownpeculiar influences^on the metal as may be see
. Railway mechanical engineer . omaticthis particular case is very apparent. In instances of this cut-out to stop and start the motor when air pressure riseskind, the ratio between the drive pulleys or gears on the or falls below the desired pressure. The first cost of such in-motor and compressor should be increased in order to de- stallation is higher, but it is a great economy in tlie lont; run. Principles of Oxvacetylene Fusion WeldingPart 6—Welding Cast Iron, Continued By Alfred S. Kinsev* THE five chemical elements in cast iron have their ownpeculiar influences^on the metal as may be seen bythe following:Carbon. When a welder gets cast iron in the moltencondition he has affected the carbon to such an extent thatit is all of one form and entirely absorbed by the pure when the molten iron solidifies, some of the carbon stayscombined with the pure iron and is called combined carbon,while the remainder of the carbon stays free of the iron andis sometimes called free carbon, but as it is of the nature of. Improvised Preheating Furnace for Cast Iron Welding jrraphite like the leaf! of a pencil, it is more often called- f)hitic carbon. It is the amount of these two carbons1 their to one another which makes cast ironij;ird or .soft, strong or weak. Now the amount of carbon which remains combined andthat which graphitic dcjK-nds on the way the welderallows the iron to c(X)l. If it c(x<ls fast, most of the carbonwill remain combined with the iron and the cold be so hard it (annot be machined. On the oilier hand,very .slow corac1ict, Steven* Inalitute of Technology, adviury»^rvice engineer, Air Keduction Company. graphitic carbon, which will give the casting the degreeof softness it was intended to have. There is also another characteristic of carbon which thewelder must consider, and that is that it will bum. Whencast i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
