Hardness checks of the cropped area revealed excess cementite and a hardened heat-affected zone. This method of cropping rail for oxyacetylene pressure butt welding is not recommended unless the cementite and heat-affected area is removed by other means. Because of the large quantity of metal removed (washed-out) during the electric-flash butt-welding process, cropping by an oxygen-gaoline torch may be acceptable, but if cementite becomes entrapped in the weld interface during the welding process, a weld failure may result. If cementite becomes entrapped in a weld produced by a thermite welding process, it will act as a stress raiser which promotes fatigue failure. In rail torch-cut for application of joint bars, the presence of cementite on the rail faces may promote head and web separations.

  • Corporate Authors:

    American Railway Engineering Association

    59 East Van Buren Street
    Chicago, IL  United States  60605
  • Publication Date: 1966-2

Media Info

  • Features: Photos; Tables;
  • Pagination: p. 483-489
  • Serial:
    • Volume: 67
    • Issue Number: 598
    • Publisher: American Railway Engineering Association

Subject/Index Terms

Filing Info

  • Accession Number: 00040467
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 22 1976 12:00AM