"CHEVRON CRACKING" -- A NEW FORM OF HYDROGEN CRACKING IN STEEL WELD METALS

The problem of "chevron cracking" has been found to occur in welds deposited by shielded metal arc welding and shielded arc welding with a wide range of consumables. Ultrasonic inspection has revealed the existence of chevron cracks in components such as heavy module structures for the N. Sea oil production platforms, circumferential seams in pressure vessels, etc. The unusual orientation of and morphology of the cracks <not easily related to other forms of weld metal cracking> has given rise to some speculation about the causes and mechanism. Their occurrence with 'low hydrogen' consumables tended to exclude this element as a causative factor. However, hydrogen was eventually assumed to be the most likely cause by excluding all the other possibilities on the available evidence. The experimental work described in this paper was intended to establish the controlling parameters and mechanism of chevron cracking.

  • Supplemental Notes:
    • Welding J., 61 <1982>, p.222-s <July> (7 pp., 12 ref., 3 tab., 2 tab., 1 diag., 10 phot.)
  • Authors:
    • Mota, J M
    • Apps, R L
  • Publication Date: 1982

Language

  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00686305
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM