DEVELOPMENT OF AUTOMATIC WELDING PROCEDURES TO MEET TOUGHNESS REQUIREMENTS FOR OFFSHORE STRUCTURES

The report discusses investigational work leading to formally-agreed welding procedures for submerged-arc seam welds in tubular members for offshore platforms, in as-welded and stress-relieved conditions. The fitness-for-purpose of welds produced by such procedure is discussed in terms of full-thickness COD tests carried out at 38 mm in the as-welded condition, and at 38 mm and 63 mm in the stress-relieved condition. It was found that the stringent requirements with respect to impact toughness, contained in current clients' specifications, can be achieved with a comfortable margin, by the selection of suitable consumables, over a range of heat inputs and interpass temperatures. Defect tolerances, computed on the basis of COD tests, suggest that good NDT practice, using established techniques, will ensure that no defects greater than tolerable size are left in the structure, in the as-welded condition. After stress-relief, large through-thickness defects were shown to be tolerable. (Author)

• Corporate Authors:

  British Steel Corporation

  Information Services
  Sheffield,   England 
• Authors:
  • George, M J
  • CLARK, A
  • Kirkwood, P
• Publication Date: 1974-4

Media Info

• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Cracking; Inspection; Measurement; Metal heating; Offshore structures; Welding; Welds
• Uncontrolled Terms: Heat treatment
• Old TRIS Terms: Crack opening measurement; Weld inspection; Welding techniques
• Subject Areas: Bridges and other structures; Marine Transportation; Materials; Vehicles and Equipment;

Filing Info

• Accession Number: 00057705
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: GS/PROD/149/3/74/C
• Files: TRIS
• Created Date: Oct 11 1974 12:00AM