Author(s)

G.R. Stevick & I. Finnie

Abstract

Crack initiation and growth in weldments at elevated temperature G.R. Stevick,*I.Finnie* "Berkeley Engineering and Research, Inc., Berkeley, CA, USA ^University of California, Department of Mechanical Engineering, ABSTRACT This paper treats the initiation and propagation of cracks in a submerged arc weld at elevated temperature. The specific configuration considered is a double-V weld in longitudinally welded piping. For the case in which the creep properties of the weld and base metals differ it has previously been shown that significant stress concentrations may develop at the weld metal-base metal interface, which may lead to localized cracking early in life. Crack initiation is estimated by calculating the expected time for a single crack to form from the coalescence and growth of cavities emanating from grain boundary inclusions. For crack propagation calculations, the C* integral for typical design stresses is evaluated as a function of crack size and different ratios of weld/b

Keywords