Mocouples and viewed using a thermal camera. The rail temperatures were monitored with ther. In the experiments, 3/4- andģ/8-inch holes were drilled at the neutral axis of the rail inįAST track. Istrationâs (FRAâs) Facility for Accelerated Service Testing TTCI performed a metallurgical examination of mechani-Ĭal hole drilling to the rail web at the Federal Railroad Admin. The third system reported using gas welding asĪn alternative procedure to join cable to worn rail. Rail connections since 1988 and has experienced no rail fail. Place of copper-based, exothermic welding for all cable-to. The second transit system has been using clamp connectors in Theįirst transit system eliminated its mechanical connector usageīecause of bolt hole failures and loose bolts. Now use welding exclusively for cable-to-rail connection. Three systems used mechanical connections in the past and Specifically associated with the mechanical connectors. Systems stated that there had been no failures that could be Reported rail damage, the cause of which was determined toīe loose mechanical connectors (i.e., arcing). Tional work will be needed to formulate complete and practi-Įight of the systems surveyed used mechanical connectors Tion 5 provides a generic ârecommended practices.â Addi. Using the information currently available to TTCI, Sec. ¢ Lack of pre- or postwelding heat treatments for alloy rails. ¢ Lack of training for standard weld installation proce. Welds had generally worked well when the welds were Survey results indicate that copper-based, exothermic Other systems have identified cable-to-rail exothermic weldsĪs a cause for rail failures or rail defects. Lems from copper-based, exothermic welds. Copper-based, exothermic welding is the pre-ĭominant procedure to connect electrical cables to rail.Įighteen of the transit systems experienced no major prob. Welding to connect electrical cables to rail, and 27 of them still Tems surveyed, 28 provided responses to the questionnaires.Īll 28 of these systems have had experience using exothermic Trated on cable-to-rail connecting processes and any associated ¢ Developing a draft recommended industry practice forĪttaching heavy electrical cable to rail.Ī five-page survey was developed and sent to 31 transit andĬommuter rail systems in North America. Whether the cable-to-rail connections introduce damage ¢ Performing metallurgical examinations to determine Ing of heavy cables to the rail and (2) other methods for Lems associated with (1) copper-based exothermic weld. ¢ Performing an industry survey of practices and prob. The project is supported by TCRP Project D-7 Improvements for methods of connecting heavy electricalĬables to rail. (AAR), has studied the current practices and possible (TTCI), a subsidiary of the Association of American Railroads Since 2001, the Transportation Technology Center, Inc. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.ĮXOTHERMIC WELDING OF HEAVY ELECTRICAL CABLES TO RAIL Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
0 kommentar(er)
