. Railway mechanical engineer . e practice described in the April issue ofthe Railway Mechanical Engineer and- confined primarilyto methods and tools used in applying body tubes, super-heater flues and arch tubes. This second installment of thearticle deals with the use of welding in tube work, particularemphasis being placed on recommended maintenance prac-tice in enginehouses. An effective flue shop equipment andlayout is also described, the latter part of the article beingdevoted to a valuable discussion of successive safe endingand the necessity of keeping boiler tube service records.—The
. Railway mechanical engineer . e practice described in the April issue ofthe Railway Mechanical Engineer and- confined primarilyto methods and tools used in applying body tubes, super-heater flues and arch tubes. This second installment of thearticle deals with the use of welding in tube work, particularemphasis being placed on recommended maintenance prac-tice in enginehouses. An effective flue shop equipment andlayout is also described, the latter part of the article beingdevoted to a valuable discussion of successive safe endingand the necessity of keeping boiler tube service records.—The Editors. THE growing practice of electrically welding tubes andflues to back tube sheets saves a great deal of boilertrouble and maintenance work. However, weldingalone will not hold carelessly set tubes and flues. Each oper-ation should be carried out as carefully and thoroughly asthough no welding were to be done. The metal of the weld is somewhat brittle and may beporous on account of tiny blow holes that form as the metal. Fig. 1—Section of Tube Sheet with Charcoal Iron Boiler TubesWelded in Place solidifies from the molten state. The welding metal alonetherefore cannot be depended upon to hold the tube in placeor prevent leakage. By uniting the bead to the sheet, however, the weld fur-nishes the strength and stiffness necessary to hold theshoulder of the tube against the ferrule, just as it was leftby the expanding tool and may also be dense enough toprevent a loosened tube from leaking in an emergency. Electrically Welding Firebox Ends of Tubes Setting Tubes and Flues for Welding.—Expand, roll andbead as described previously (first installment, March issue),using no lubricant on the setting tools. If it is felt necessaryto use a lubricant, the following corn oil soap has been foundto be satisfactory and is said not to affect the welding: Note:—Tills is the second instalment of an article on suggested tubepractice wliich has been copyrighted by the Parkesburg Iron
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
