A high-speed automatic welding technique has been developed by the Nippon Steel Corporation in Japan for welding large steel piles, in offshore oil platforms. Most welding of vertical pipes is done manually, the new equipment has automatically welded large diameter thick-steel pipes on a drilling and production platform in the oil and gas fields off Aga in the Niigata Prefecture. The welding process differs from conventional techniques in several ways in that the welding current is pulsed DC rather than continuous DC and there is no gas shielding the arc. Nonshielded welding techniques are conducted with a flux-cored welding wire that generates its own shielding gas from the flux. This has advantages over gas shielded welding because high winds can disturb the shielding gas. Nippon Steel says that the welding efficiency of the new system can be very high because there is no shield gas. The welding gap is narrower than usual; but the equipment still produces a deep weld, and the weld zone is less prone to cracking. (No further information in article).

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  • Supplemental Notes:
    • For further information contact - Nippon Steel Corp; 6-3, Ote-Machi 2-Chome; Chiyodaku; Tokyo, Japan.
  • Corporate Authors:

    IPC Magazines

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  • Publication Date: 1975-4

Media Info

  • Pagination: p. 136
  • Serial:
    • Volume: 66
    • Issue Number: 945
    • ISSN: 0262-4079

Subject/Index Terms

Filing Info

  • Accession Number: 00097588
  • Record Type: Publication
  • Source Agency: IPC Magazines Limited
  • Files: TRIS
  • Created Date: Jul 29 1975 12:00AM