. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . welded tire. Average energy to produce break, Strength, r A s gas weld Thickness Carbon Natural las to natural in. per cent. welded per cent. 6,150 11,000 12,600 3,520 2,710 5,990 26,600 .... * 5,750 3,280 * 4,100 3,280 * 10,250 2,460 13,900 6,800 5,340 5,900
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . welded tire. Average energy to produce break, Strength, r A s gas weld Thickness Carbon Natural las to natural in. per cent. welded per cent. 6,150 11,000 12,600 3,520 2,710 5,990 26,600 .... * 5,750 3,280 * 4,100 3,280 * 10,250 2,460 13,900 6,800 5,340 5,900 147,500 60,000 Average The results of the drop tests show that the gas weld-ing of the flange reduces the resistance of the tire toshock approximately 50 per cent while as will be seenlater from the resume of the tension tests, this same local Fig. 4 As for electric welding of the flanges, only three tiresections were welded for testing purposes. These werethe three that are marked with an asterisk (*) in theabove table. The drop test energy required to break. Figs. 5 and 6 these three specimens was 4,920, 7,380 and 10,250 footpounds respectively. If an average of these results is taken, it will showan increase in strength of about 10 per cent above thatof the three similar breaks of the tire in the natural con- January, 1924 RAILWAY AND LOCOMOTIVE ENGINEERING 23 dition as given in the tabic. At the same time, it willappear thai there was no change in the strength of thetension test specimens. This is due to the effect, alreadynoted that the electric welding process produces only avery narrow hard area, that (lid not reach down to andwas nnt included in that portion of the metal from whichthe tension test specimens were obtained, On the otherhand, experience with other samples of medium carbonsteel has shown that this narrow hard area has a low re-sistance to vibratory ■-trains and contributes to an earlyfailure of the tire. Tension test
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