. The Iron and steel magazine. ^ success insome very good welds at their Elkhart shops, about which ) read a very interesting paper at the last annual meetingof the American Foundrymens Association, giving a full accountof each step in the operation. On a preliminary test, a weldedbar 2J X 2^ stood a pressure of 50 tons on supports 20 inches 2t6 The Iron and Steel Magazine apart, before breaking, and that after two sides of the reinforc-ing collar had been machined off. In all there are records of thirty engines with welded framesthat have been in service for three months or longer. Fai
. The Iron and steel magazine. ^ success insome very good welds at their Elkhart shops, about which ) read a very interesting paper at the last annual meetingof the American Foundrymens Association, giving a full accountof each step in the operation. On a preliminary test, a weldedbar 2J X 2^ stood a pressure of 50 tons on supports 20 inches 2t6 The Iron and Steel Magazine apart, before breaking, and that after two sides of the reinforc-ing collar had been machined off. In all there are records of thirty engines with welded framesthat have been in service for three months or longer. Failuresare recorded only in isolated instances and are assignable totwo different reasons: First, wrong construction of Locomotive Frame: Welded in the Jaw Second, insufficient Thermit; in other words, insufficientcirculation — therefore, insufficient fusion. For those familiar with the process, a weld that breaks onaccount of lack of cohesion at the welding surface is attributableunder all circumstances to lack of experience or care, except inone particular case. It is possible for Thermit welded frames to break in spiteof proper execution of the work. The original break is due, inthe first place, to a structural defect. With the l^reak in such The TlhiDiii Process iii Aiiicricaii Pvacticc 217 a i)osition as to necessitate the entire removal of the reinforcingcollar, it is too much to expect the mere bridging of the brokenends In Thermit steel to overcome this innate weakness. An important factor in success in welding locomotive framesis to allow for equal shrinkage of parallel parts; also, whereverpossible, to spread the ends apart in order to let them come backwhen the iron begins to set. Another
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
