COPPER-NICKEL FOR SHIP HULL CONSTRUCTIONS -- WELDING AND ECONOMICS

Copper/nickel alloys such as CA-706 <88.6% Cu, 9 to 11% Ni> have excellent resistance to erosion/corrosion and to biofouling, and could be used to protect hulls either as sheathing <i.e., bonded in situ to the steel plating of hulls or modules already erected> or as cladding <i.e., where the alloy is already bonded to the plates as received by the shipbuilder>. Sheathing is more versatile than cladding and has other advantages, including lower cost, and the Author <of Franklin Research Center, Philadelphia> here gives an account of laboratory tests in which commercial hull-steel test-plates were sheathed with Cu/Ni alloy, and discusses the relevant full-scale economics. It was found that Cu/Ni could be welded to the steel satisfactorily in all positions by the shielded metal arc process; some unsatisfactory results were obtained with gas metal arc welding; preproduction primer caused no difficulty with either process. Some results of a brief mechanical evaluation of the weldments are given. Economic analysis of Cu/Ni sheathing for the hulls of large ships produced very attractive results; the effective discounted cash rate of return was calculated at 33.5% and the zero-interest break-even point at 4.2 years. It is mentioned that Cu/Ni-clad steel is cost effective for special requirements.

  • Supplemental Notes:
    • Welding J., 61 <1982>, p. 23 <Dec.> (8 pp., 14 ref., 7 tab., 2 graphs, 3 diag., 2 phot.)
  • Authors:
    • Sandor, L W
  • Publication Date: 1982

Language

  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00684637
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM