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

Hae-Woo Lee; Hyok-Ju Kim; Jeong-Ung Park; Chang-Yong Kang; Jang-Hyun Sung

Korean Journal of Materials Research, Vol.14, No.9, 642-648, September, 2004

DOI10.3740/MRSK.2004.14.9.642 Export Citation

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

Hae-Woo Lee^†, Hyok-Ju Kim, Jeong-Ung Park¹, Chang-Yong Kang², and Jang-Hyun Sung³

Welding research team, Samsung heavy industries, Gyungnam 656-710, Korea
¹Department of Civil engineering, Chosun university, Gwangju 501-759, Korea
²Div. of Mat. Sci. and engineering, Pukyong national university, Busan 608-031, Korea
³Department of metallurgical engineering, Dong-A university, Busan 604-714, Korea

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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.

Keywords:CTOD;SAW;FCAW;heat input;pre-cracking;three-point bending;acicular ferrite

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[1] Towers OL, Dawes MG, J. Test. Eval., 11(1), 34 (1983)

[2] Dawes MG, Metal construction British welding J., 3(2), 61 (1971)

[3] Lee HW, Kang SW, Welding Journal, American Welding Society, 80(6), 137 (2001)

[4] Pargeter RJ, Dolby RE, in Proceedings of the American welding society, IIW Doc. IX-1377-85, Miami, Fla., (1985).

[5] BS 5762 Methods for crack opening displacement testing, British standards institution, (1979).

[6] BS 7448 : Fracture mechanics toughness test part I and part II, BSI, (1997).

[7] Kou S, Welding Metallurgy, John Wiley and Sons, New York, p. 326-333 (1987).

[8] Lee HW, Kang SW, Um DS, Welding J, American Welding Society, 77(12), 503 (1998)

[9] Bonnet C, Charpentier FP, in Proceeding of the welding institute, p. 8, Abington, U.K., (1996).

[10] Potapov NN, Welding Journal, 72(8), 367 (1993)

[11] Hooijimans JW, Ouden GD, Welding Journal, 71(10), 377 (1992)

[12] Chung HH, Kim CM, Kim HS, Kim WS, Hong SH, Korean welding journal, 17(2), 98 (1999)

[13] Kapadia BM, ASTM STP, 648, 244 (1978)

[14] Ohta A, Nishijima S, The Society of materials science, 1, 157 (1985)

[15] Dawes MG, Ph. D thesis, Council for national acadernic awards, London, England, p. 85 (1976).