The failure of a head-hardened rail at the Facility for Accelerated Service Testing (FAST) was attributed to fatigue. The failure occurred at a flash-butt welded joint in a 136 lb/yd (67.5 kg/m) section which had been on the high side of a curve. The failure began on the gage side of the rail at the highly stressed head-to-web fillet. Metallurgical examination showed evidence of plastic flow and surface roughness resulting from shearing the weld flash from the rail, and some decarburization associated with the welding. It was recommended that close control be exercised in flash welding to avoid decarburization and other weld defects, and that weld surfaces be carefully finished off to be as free as possible of surface defects.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188122
  • Record Type: Publication
  • Source Agency: Association of American Railroads Technical Center
  • Report/Paper Numbers: AAR Rpt R-326 Res Rpt.
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM