. Railway mechanical engineer . Electrically Safe Ending Boiler Tubes Summary of Results in Safe Ending Boiler Tubes and Flueswith the Thomson Electric Butt Welder at Nashville. Tenn. Superintendent of Machir By J. J. Sullivan ., Nashville, Chattanooga & St. Louis, iVashville. Tenn. THE recent revival of interest in the application of safeends to boiler tubes and flues by the electric buttwelding process is indicated by the published report ofthe Master Boiler Makers Association Committee on Weld-ing Safe Ends. According to that report the Xorfolk & machine and flue roller and Fig. 2 being a p
. Railway mechanical engineer . Electrically Safe Ending Boiler Tubes Summary of Results in Safe Ending Boiler Tubes and Flueswith the Thomson Electric Butt Welder at Nashville. Tenn. Superintendent of Machir By J. J. Sullivan ., Nashville, Chattanooga & St. Louis, iVashville. Tenn. THE recent revival of interest in the application of safeends to boiler tubes and flues by the electric buttwelding process is indicated by the published report ofthe Master Boiler Makers Association Committee on Weld-ing Safe Ends. According to that report the Xorfolk & machine and flue roller and Fig. 2 being a plan of the flueshop with the moveinent of tubes and flues through the shop_The process of butt welding safe ends to allsizes of boiler tubes and flues has been used at Nashvillesince August, IM6, so that the results given were secured. Western now has in service about 280,960 tubes welded by over an extended test jieriod during which the electricalh. Fig. i_Rolling a Boiler Tube After It Has Been Safe Ended in Thomson Electric Butt Welde this method, 152,000 of which were welded in 1919 with nofailures reported. The Union Pacific was reported to be ableto weld about 60 tubes per hour and to have more than 700,-000 electric welded tubes in service with only two failures. The practice on the Nashville, Chattanooga & St. Louis atthe Nashville shops is summarized in the following articlewhich includes two ;, Fi. 1 showing tlie welding welded tubes and flues gave excellent service without type 40-A electric welding machine used is made bythe Thomson Electric Welding Company, Lynn, Mass., andhas a capacity of welding up to and including 5^4 in. general principle of the machine is that heat is inducedby passing a large volurne of electric current at a low voltagethrough the butting tube and safe end to he welded, the heat- Makch, 1922 RAILWAY MECHANICAL ENGINEER ing effect being caused by the resi
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