. American engineer . er is slowlymoved back over the added material and the edges A, Fig. 3,are smoothed over and welded to the Vd out part. The oper- ation of adding metal is repeated successively for the 2 in. dis-tance, Fig. 3, until the welded portion is flush with the sheet,and the succeding 2 in. distances are welded in the same man-ner. As the flame will heat the metal to the proper consistencyonly 1/16 in. deep, care is necessary so that only 1/16 in. is addedat a time. The operation of adding only 1/16 in. in conjunctionwith the heating of the metal to the proper consistency, is thes
. American engineer . er is slowlymoved back over the added material and the edges A, Fig. 3,are smoothed over and welded to the Vd out part. The oper- ation of adding metal is repeated successively for the 2 in. dis-tance, Fig. 3, until the welded portion is flush with the sheet,and the succeding 2 in. distances are welded in the same man-ner. As the flame will heat the metal to the proper consistencyonly 1/16 in. deep, care is necessary so that only 1/16 in. is addedat a time. The operation of adding only 1/16 in. in conjunctionwith the heating of the metal to the proper consistency, is thesecret of successful autogeneous welding. As the metal gradu-ally heats it approaches the consistency of wax, having a glassyappearance, and this is the proper time to fuse the stick offlux and the sheet; this point is reached just a moment be-fore the metal begins to run. Many operators make the mis-take of heating the iron beyond this point to one at whichoxidization takes place and little white particles of slag can. Sc^^e ofO/d She€-^ Line C-0Fig. 4. then be seen floating in the molten metal; these are the causeof pinholes in the weld after cooling. A method by which an operator can determine the properdegree of heat at which to fuse the flux and sheet is to makean experimental weld directly overhead, in which case if thesheet is heated too much the iron will melt and drop. By prac-ticing in this manner, successful welds can be made withoutheating the metals to a temperature which is too high. Whenheating, it must be borne in mind that the sheet must be at theproper temperature before the metal of the flux is fused withit. The burner flame should be directed on the sheet 54 in-ahead of the moving stick of flux, to prevent the metal in the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
