APPLICATION OF NARROW-GAP PROCESS FOR THE FABRICATION OF HEAVY WALL PRESSURE VESSELS

The narrow-gap welding process is based on the use of a single-pass, one-layer technique for the gas metal arc welding (GMAW) of an 9-mm wide groove in up to 300-mm thickness of mild and low-alloy steel in the fabrication of heavy-wall pressure vessels. The process was introduced about 10 years ago by the Battelle Memorial Institute and is intended to cut welding time and costs by greatly reducing the cross-sectional area of the groove. It is also intended to improve the mechanical properties of the weld through the application of low heat input welding duction, narrow-gap welding has been studied in various countries as an ideal arc-welding process for joining thick plates and different methods of utilising it have been developed; most of them, however, have not gone beyond the laboratory stage as they tend to produce weld defects. The present Authors have developed a new and unique narrow-gap welding process by combining special techniques with conventional welding procedures. For the last three years this process has been successfully used in actual fabrication. A general description of the process is given and typical examples of its practical application. Properties of the weld joints made are discussed.

  • Availability:
  • Supplemental Notes:
    • Paper presented at American Welding Society, 60th Annual Meeting, Detroit, 2-6 April, 1979.
  • Corporate Authors:

    American Welding Society

    2501 NW 7th Street
    Miami, FL  United States  33125
  • Authors:
    • Sawada, S
    • Hori, K
  • Publication Date: 1979-9

Media Info

  • Features: References;
  • Pagination: p. 17
  • Serial:
    • Welding Journal
    • Volume: 58
    • Publisher: American Welding Society
    • ISSN: 0043-2296

Subject/Index Terms

Filing Info

  • Accession Number: 00308960
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Mar 31 1980 12:00AM