原文传递
Improved Reliability of Thermite Field Welds Used on High Speed Rail Lines. High-Speed Rail IDEA Program. Final rept. (Sep 2000-Jan 2002).
| 题名： | Improved Reliability of Thermite Field Welds Used on High Speed Rail Lines. High-Speed Rail IDEA Program. Final rept. (Sep 2000-Jan 2002). |
| 作者： | Lawrence-F.V.; Cyre-J.P.; Bakan-C.P. |
| 关键词： | *Welds-; *Thermite-welding; *Railroad-tracks.;Welded-joints; Notches-; Fatigue-tests; Sealants-; Coatings-; Maintenance-; Reliability-; Geometry-; Rail-transportation; Mechanical-properties; Cracks-; Design-. |
| 摘要： | This project investigated techniques for improving the fatigue performance of thermite welds used to weld rails in the field. The objective was to diminish the likelihood of initiating fatigue cracks in two critical locations: (1) rail web location; and (2) rail base locations where cracks develop at weld toes because of local geometric irregularities (notches). New designs that improve the local notch-root geometry of welds were developed and tested. New types of sealant between the rail and the mold used in thermite welding to produce smoother surfaces in these fatigue-critical notch-roots were also evaluated. Alternatives to the currently-used fluxes and techniques to coat the interior weld molds to produce a smoother cast surface were also investigated. The effectiveness of these techniques were evaluated through full-scale 3-point bend tests of thermite welds using modified molds with improved weld geometries, mold sealants, and internal coatings. The results demonstrated significant increases in the fatigue life of welds by improving the geometry of the web-base weld toes. Specific improvements were reducing the flank angle and increasing the weld toe radii. The final product is recommended revisions to the equipment, materials, and technique used by track maintenance personnel when they perform thermite welding in the field. |
| 报告类型： | 科技报告 |
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