. Railway mechanical engineer . ost striking example ofthe use of electric welding, for since the advent of thewelded tube it is not uncommon for a set of tubes toremain in a locomotive until the limit of the time allowedby law. One trunk line furnishes figures showing 20,000miles per tube failure before welding compared with 50,000miles per welded tube failure. Not only on railroads, but in marine repair work, theelectric welder has for a long time held an important place and one in which the principal recjuirement is reliability ofthe repairs made. COST OF WELDING 1 The relationship between
. Railway mechanical engineer . ost striking example ofthe use of electric welding, for since the advent of thewelded tube it is not uncommon for a set of tubes toremain in a locomotive until the limit of the time allowedby law. One trunk line furnishes figures showing 20,000miles per tube failure before welding compared with 50,000miles per welded tube failure. Not only on railroads, but in marine repair work, theelectric welder has for a long time held an important place and one in which the principal recjuirement is reliability ofthe repairs made. COST OF WELDING 1 The relationship between power intake at the motor gen-erator and metal applied at the weld has been foimd to befrom to 2,6 kilowatt-hours per pound of metal a welding current of 175 amperes, about electrodes are used per hour. In the previous articleit was shown that 54 per cent must be added to the volumeof the opening to find the amount of welding metal requiredand that 26 per cent of the electrode is wasted in stub 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
