. Railway mechanical engineer . MICROSCOPIC STUDY OF WELDED TIRES BY SOME time ago, the writers attention was drawn to tliefact that it was rather common practice to fill up slidflat spots on steel tires, and to make other repairs of asimilar nature, by fusion welding methods, with a view tosaving the metal of the tire which would have to be turnedoff to remove the flat spot. This practice was started be-cause of the apparent resultant saving, not only in tire metal,but in repair cost and time, and if the method was successfulit is obvious that this saving would be very great. But t
. Railway mechanical engineer . MICROSCOPIC STUDY OF WELDED TIRES BY SOME time ago, the writers attention was drawn to tliefact that it was rather common practice to fill up slidflat spots on steel tires, and to make other repairs of asimilar nature, by fusion welding methods, with a view tosaving the metal of the tire which would have to be turnedoff to remove the flat spot. This practice was started be-cause of the apparent resultant saving, not only in tire metal,but in repair cost and time, and if the method was successfulit is obvious that this saving would be very great. But there. Fg. 1—Section of Tire Showing Welded Flat Spot. was the possibility, and a very strong one, that such a methodwas in reality unsatisfactory, and even dangerous, becauseof the changes produced in the structure of the metal by theheat, which would change its physical properties. As the writer knew of no tests showing what had occurredduring and after the welding, he decided to make some forhis own information, and the results so strongly confirmedhis beliefs that they are here presented in the hope that thosewho may take the trouble to study the matter will see thedanger of the practice. Fusion welding processes are capableof wide application, but diey are not a panacea and shouldbe used with discretion. For the purpose of test a scrap tire from a switch engine,shown in Figs. 1 and 2, was selected and the physical andchemical properties were obtained from the comparison of these properties with tlie A. S. T. M. specifi-cations for standard switch engine tires is made i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
