. American engineer . magnetic current also increases the strengtli of the weld owingto its concentrating intluence and the cooling effect on the prevents oxidization of the molten particles while in transitand the formation of slag and pin holes that sometimes formin the weld. The welding pencil consists of a very pure grade of Swedishiron of a definite cross sectional area. It has been determinedby careful laboratory research that the quality of the repairingmaterial and the pencil diameter have a decided influence on the pairing material in its fused state, and thus improves the qual
. American engineer . magnetic current also increases the strengtli of the weld owingto its concentrating intluence and the cooling effect on the prevents oxidization of the molten particles while in transitand the formation of slag and pin holes that sometimes formin the weld. The welding pencil consists of a very pure grade of Swedishiron of a definite cross sectional area. It has been determinedby careful laboratory research that the quality of the repairingmaterial and the pencil diameter have a decided influence on the pairing material in its fused state, and thus improves the qualityof the weld. DESCRIPTION OF .\Pr-\R.\TUS. .* electric welding installation consisting of a motor genera-tor set, the necessary control apparatus, measuring instrumentsand protective and steadying resistances, is shown in Fig. outfit is in use in a railway shop. The motor generator isprovided to convert the standard current available into directcurrent at voltages suitaljle for welding. Mence the motor may. Fig. 16—Cracked Rocker Arm Chipped for Welding. properties of the weld. A definite relation exists between thesize of the pencil, the amount of the current, and the tensilestrength of the weld. Hence the quality of the material and thesize of the pencil must be carefully selected. In order to prevent oxidation and the consequent formation ofslag, and also to provide certain ingredients which affect thewelding material chemically and so benefit it physically by mak-ing it soft and ductile, the welding pencil or electrode is cov-ered with a flux. When the welding operation is carried on, theflux melts and vaporizes, enclosing the molten particles and thearc to the exclusion of atmospheric oxygen which attacks the re- Fig. 17—Rocker Arm Repaired and Ready for Service. be either of the direct or the alternating current type. The gen-erator is wound to furnish a maximum constant output of 200amperes direct current at a range in potential of 50 to 80 range
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
