. Locomotive engineering : a practical journal of railway motive power and rolling stock . lds weremade at Sacramento shop. Scarfing forall welds were made in a similar man-ner. w S-g H Kind o( Weld Fuel # 0 »s-g oaJ ^g» 0^5 H«.£ I M. & F. Scarf. Oil. 49084 10,6 2 1-375 4 465 3 Coal. J-375 50842 3- 4 t. ,. 1-375 50559 s Lap Weld. Oil. 1-375 45603 6 Coal. I-37S 40485 4-1 Average of Oil Welds 47051 Average of Coal Welds 472*^5 Test section in above bars was 8 inches 236 LOCOMOTIVE ENGINEERING June, 1900. long, including the welded portion at cen-ter. All fractures
. Locomotive engineering : a practical journal of railway motive power and rolling stock . lds weremade at Sacramento shop. Scarfing forall welds were made in a similar man-ner. w S-g H Kind o( Weld Fuel # 0 »s-g oaJ ^g» 0^5 H«.£ I M. & F. Scarf. Oil. 49084 10,6 2 1-375 4 465 3 Coal. J-375 50842 3- 4 t. ,. 1-375 50559 s Lap Weld. Oil. 1-375 45603 6 Coal. I-37S 40485 4-1 Average of Oil Welds 47051 Average of Coal Welds 472*^5 Test section in above bars was 8 inches 236 LOCOMOTIVE ENGINEERING June, 1900. long, including the welded portion at cen-ter. All fractures showed a trace ofcrystallized iron, and the results are some-what low for welded bars. This is prob-ably due to the fact that the original barwas not first-class iron, though this wouldnot affect comparative results. Tests and 6 showed unwelded iron at the frac-ture, the coal weld No. 6 being the poor-est. Including this poor weld (No. 6),the average of coal-welded bars shows aslight advantage in functions of strengthand ductility. It was noted during the process of oil-. Locomotive Engineering FLEXIBLE METALLIC JOINT. welding that there was considerable scal-ing of the iron surfaces at high tempera-tures, due to direct contact of the scaling or oxidation is due to excessof air in the blast, and the direct contactof the blast with iron surfaces to bewelded should be avoided in order thatsurfaces may mor. readily unite, or thatthe best effect may be produced. In chemistry the oil blast as used atWest Oakland is an oxidizing flame. Theflame within a coal fire is what is knownas a reducing flame. The former tends toform oxide of iron at high temperatures;the latter, within coal fire, tends to pre-vent it. As to the cost of maintaining the oilblast at welding heat; the amount of oilused was obtained by timing the oil blast(for over an hour) under constant airpressure and weighing oil tank before andafter. The time so taken was used in esti-mating amount of com
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
