. Railway mechanical engineer . Fig. 5—Broken Cylinder Which Was Repaired by Arc Welding If the volume of the opening should amount to 5 lb. ofmetal and we increase it by these percentages, it will takeabout 10 lb. of electrode to do the work; at lb. per hour,the time required will be about three hours, and at kilo-watt hours per lb. of metal applied (which is 54 per centover 5 lb.) there will be 18 kilowatt hours, at a cost of about30 cents. The cost of electrodes at 6J^ cents per lb. is 65. Fig. 6—Reboring the Welded Cylinder cents. To these charges must be added the cost of laboran
. Railway mechanical engineer . Fig. 5—Broken Cylinder Which Was Repaired by Arc Welding If the volume of the opening should amount to 5 lb. ofmetal and we increase it by these percentages, it will takeabout 10 lb. of electrode to do the work; at lb. per hour,the time required will be about three hours, and at kilo-watt hours per lb. of metal applied (which is 54 per centover 5 lb.) there will be 18 kilowatt hours, at a cost of about30 cents. The cost of electrodes at 6J^ cents per lb. is 65. Fig. 6—Reboring the Welded Cylinder cents. To these charges must be added the cost of laborand overhead, which will more than double the total. ELECTRODES There is a definite relationship between the size of elec-trodes and the proper amount of current to be used. Weldingcurrent ranges from 70 to 160 amperes and electrode sizesfrom J/8 in. to 5/16 in. It is also of importance that theelectrcxles be of the best qualit>-. The electrodes should be 158 RAILWAY MECHANICAL EXGINEER Vol. 91, No. 3 clean and bright and of uniform size and composi-tion, and for general work the carbon content should be welds are sure to result from the use of impropermaterials. The best electrodes are those made of eitherNorway or Swedish welding iron, or certain Ijnuids of sim-ilar composition manufactured in this country. A littlemanganese in the welding material does no harm, but thepresence of phosphorus or sulphur has the same Ijad effectas in other iron and steel products. USE OF FL
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
