The Federal Highway Administration (FHWA) sponsored a number of research and development (R&D) programs to improve electroslag welding (ESW) technology in the 1980s. As a result of this research, a new Narrow-Gap Improved Electroslag Welding (NGI ESW) process was developed by the Oregon Graduate Institute of Science and Technology (OGI), Beaverton, Oregon. The results of the OGI research are described in FHWA Report No. FHWA-RD-87-026, "Improved Fracture Toughness and Fatigue Characteristics of Electroslag Welds", published in October 1987. In the OGI research, quantitative correlations between welding variables, alloy content, grain structure and microstructure, and toughness were systematically studied. The NGI ESW process eliminated the drawbacks of the former ESW process, increased productivity, reduced cost, and improved Charpy V-notch toughness of welded joints, which was low in standard ESW. As a result, the NGI ESW process and procedure are recommended by FHWA for bridge fabrication. This technical information guide is intended for welding and metallurgical engineers involved in fabrication of bridge components using the NGI ESW process. The technical information provided in this document is based on FHWA Report No. FHWA-RD-87-026. This document contains scientific and technical information on the role of welding variables in the NGI ESW process, and relationships between grain structure, microstructure, and properties of the weld and the heat-affected zone, including Charpy V-notch and fracture toughness, and fatigue. This document provides a metallurgical background for modifications to standard ESW practice that improve toughness and fatigue performance of electroslag welded joints.

  • Corporate Authors:

    Northwestern University, Evanston

    Basic Industrial Research Laboratory, 1801 Maple Street
    Evanston, IL  United States  60201-3135

    Federal Highway Administration

    Office of Technology Applications, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Malin, V
  • Publication Date: 1996-1-31


  • English

Media Info

  • Pagination: 85 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00725586
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-SA-96-052, Final Report, A420-C1
  • Contract Numbers: DTFH61-93-C-00104
  • Files: TRIS, USDOT
  • Created Date: Sep 17 1996 12:00AM