. Railway mechanical engineer . s prepared so that standard5-in. test pieces could be cut from it and leave a sufficientamount of stock for forging before cutting additional testpieces. The results of tensile tests on the unforged andforged portions of this specimen are as follows: Pounds per square inch Per cent f A ^ f A Specimen Ultimate Yield Elastic Elonga- Reduction portion tensile strength point limit tion of area Unforged ... 29,125 ^iJ 114 Forged 56,900 31,600 28,000 It is interesting to observe that the proper forging not onlyincreased the strength of the meta
. Railway mechanical engineer . s prepared so that standard5-in. test pieces could be cut from it and leave a sufficientamount of stock for forging before cutting additional testpieces. The results of tensile tests on the unforged andforged portions of this specimen are as follows: Pounds per square inch Per cent f A ^ f A Specimen Ultimate Yield Elastic Elonga- Reduction portion tensile strength point limit tion of area Unforged ... 29,125 ^iJ 114 Forged 56,900 31,600 28,000 It is interesting to observe that the proper forging not onlyincreased the strength of the metal from that of a medium 456 July, 1921 RAILWAY MECHANICAL ENGINEER 457 good weld to that of a very good weld hut also improved theductility to a marked degree, the per cent elongation beingincreased 500 per cent and the per cent reduction in areabeing increased 423 per cent. Examples of Arc Welding on Locomotives The mud ring of a locomotive boiler which has been badlycorroded on the water side in service and which has been re-. Fig. -Example of Direct Overhead Welding at Junction of CrownSheet and Fire Door Sheet in Locomotive Firebox claimed by building up the corroded areas to their originalshape and thickness is shown in Fig. 2. The appearance of a set of neatly and effectively weldedflues is familiar to all and this application of electric weld-ing has proved a big money-saver for roads where bad watermust be used. For this work to be successful, however, the
Size: 1879px × 1329px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
