ELECTROSLAG WELDMENTS IN BRIDGES
In an effort to develop and verify acceptance criteria for the use of electroslag welds in bridges, a 2-phase research project has been initiated. Phase I which is designed to define the necessary acceptance specifications, will include a review of literature; a state-of-the-art report on electroslag welding; testing of laboratory specimens from full-scale welds; development of tentative acceptance tests and criteria for electroslag butt-welds based on the results of previous tasks; a summary of the Phase I findings and a work plan for phase II. Electroslag welding is defined as a process wherein coalescence is produced by molten slag which melts the filler metal and surfaces of the work to be welded. The weld pool is shielded by the slag, which moves along the full cross section of the joint as welding progresses. The conductive slag is maintained molten by its resistance to electric current passing between the electrode and the work. Welding is done in the vertical or near-vertical position, and joints are generally accomplished in a single pass regardless of the thickness to joined. The advantages and disadvantages of the process are listed, and the principles of operation are outlined with special reference to the conventional wire process and the consumable-guide process. Equipment for both processes, and the different power supplies are discussed. The base materials and electrodes used for welding as well as the fluxes and consumable guide tubes are reviewed. The process variables discussed here include joint geometry, thermal cycle, solidification pattern, form factor, imperfections, and distortion and residual stress. Current opinion regarding the mechanical properties of as-deposited electroslag weldments in structural steels is summarized with special reference to tensile properties, notch toughness fatigue and other properties. The results obtained in various testing methods are discussed.
- Digital Copy:
- An NCHRP state-of-the-art digest derived from an interim report on NCHRP Proj. 10-10, "Acceptance Criteria for Electroslag Weldments in Bridges", by W.P. Benter, Jr, U.S. Steel Research.
Washington, DC United States 20001
- Publication Date: 1975-6
- Features: Figures; References; Tables;
- Pagination: 23 p.
- NCHRP Research Results Digest
- Issue Number: 74
- Publisher: Transportation Research Board
- TRT Terms: Bridges; Butt welds; Defects; Design; Distortion (Structures); Electric power supply; Electrodes; Electroslag welding; Equipment; Fluxes; Joints (Engineering); Laboratory tests; Mechanical properties; Residual stress; Reviews; Specifications; State of the art studies; Structural steel; Weldments
- Old TRIS Terms: Consumable electrode process; Distortion; Joint
- Subject Areas: Bridges and other structures; Design; Energy; Geotechnology; Highways; Materials;
- Accession Number: 00099111
- Record Type: Publication
- Contract Numbers: 10-10
- Files: TRIS, TRB
- Created Date: Oct 18 1975 12:00AM