. The Iron and steel magazine. ent 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 brid
. The Iron and steel magazine. ent 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 operation of interest to railroad men is the weldingof spokes of drivers. In making tests of the metal of such welds, the Chicago,. Welding Spoke of Locomotive Driving Wheel Milwaukee 8c vSt. Paul R. R. found a tensile strength of 93,900pounds per square inch. The analysis agreed with that of thePennsylvania R. R., with the exception of manganese, which inthis case was only Next came repairs in marine engineering, which are mostlysuccesses obtained by Mr. Des Angcs, superintendent floatingequipment of the Long Island Railroad. A 12-inch crank shaft (13 g inches at point of fracture) ofthe fern^-boat Manhattan Beach was welded with 400 poundsof Themnt. The break was in the wheel center, necessitating 2X8 The Iron and Steel Magazine the shifting of the center to a new j^osition and shortening thepaddle boxes. The shaft was pre-heated, by a charcoal fire andhand-blower, to black heat. To protect the woodwork of theferrv-boat an asbestos ctirtain was hung around the crucible,which served its purpose admirably. The ferry-boat has beenin uninterrui)ted service for nearly three months
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
