FATIGUE STRENGTH OF CORRODED WELD JOINTS

This paper summarises results of an appraisal of measured corrosion data of a hull structure obtained through periodical surveys, corrosion tests of specimens of various welded joints, fatigue tests and stress analysis of corroded specimens. Statistical analysis of pitting corrosion on the bottom plate of oil tankers was carried out with good results. It was also found that tank cleaning has a considerable effect on the progress of pitting corrosion. Data of plate thickness on the lower part of side frames of bulk carriers was appraised by two parameters, the initiation life and progress rate of corrosion wastage. Results showed that the progress rate of corrosion wastage was larger than conventional numerals. A corrosion test of welded joint specimen was carried out under the cycles of sea water and air. Grooving corrosion had initiated at the weld toe of butt joints. The cause of grooving corrosion was presumed to be due to the difference of corrosion potential between HAZ and base metal/weld metal of the specimen. Tensile fatigue test and stress analysis of corroded specimens was carried out. The results were examined as to the relation of fatigue strength and stress concentration factor. It was confirmed that in butt joints, the stress concentration factor was increased by corrosion and fatigue strength was reduced. In a cruciform joint, the factor was nearly unchanged and the fatigue strength was hardly reduced.

  • Supplemental Notes:
    • J Soc Naval Architects Japan, v 176, Dec 1994, p 481 [10 p, 16 ref, 6 tab, 12 fig]
  • Authors:
    • Yuasa, M
    • WATANABE, T
  • Publication Date: 1994

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00711011
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM