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Microstructure and CTOD (crack tip opening displacement) of Deposit Weld Metal in 30 mm Thick Plate

  • Lee Hae-Woo (Welding research team, Samsung heavy industries) ;
  • Kim Hyok-Ju (Welding research team, Samsung heavy industries) ;
  • Park Jeong-Ung (Department of Civil engineering, Chosun university) ;
  • Kang Chang-Yong (Div. of Mat. Sci. and engineering, Pukyong national university) ;
  • Sung Jang-Hyun (Department of metallurgical engineering, Dong-A university)
  • Published : 2004.09.01

Abstract

The microstructure and crack tip opening displacement (CTOD) of deposit weld metal were investigated for a 30 mm- thick plate welded with flux cored arc welding (FCAW) and submerged arc welding (SAW) processes. The CTOD test was carried out both as welded condition and as stress-relieved specimen by local compression. The crack growth rates in FCAW were faster than those in a SAW, and the acicular ferrite content by the SAW process was increased relatively more than that by the FCAW process. The fatigue crack growth rate in a welded specimen was faster than that in locally compressed specimen. The CTOD value of locally compressed specimens was lower than that of as welded specimen. Furthermore, the CTOD value tested with the SAW process was higher than that tested with the FCAW process.

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