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RESEARCH PAPERS

Effect of Charpy V Notch Position on Impact Toughness of all Weld Metal Welds and its Relevance With ASME Codes

[+] Author and Article Information
R. P. Paranhos

 LAMAV-CCT-UENF, Av. Alberto Lamego 2000, Campos dos Goytacazes, RJ, 28013-602, Brazilparanhos@uenf.br

R. Rosenthal

 LAMAV-CCT-UENF, Av. Alberto Lamego 2000, Campos dos Goytacazes, RJ, 28013-602, Brazilruben@uenf.br

I. S. Bott

 PUC-RJ, R. Marquês de São Vicente, 225, Gávea, Rio de Janeiro, RJ, 22453-900, Brazilbott@rdc.puc-rio.br

J. Pressure Vessel Technol 128(3), 314-317 (Sep 28, 2005) (4 pages) doi:10.1115/1.2217963 History: Received September 18, 2003; Revised September 28, 2005

A neutral flux and four different wires were used to produce all weld metal submerged-arc multipass welds. Impact Charpy V transition curves were obtained from two testing series, each with a different notch position along the welded joint. The results show that, according to the notch position, distinct fractions of weld metal columnar and reheated regions are present at the notch tip. Impact toughness of the weld metal with predominance of reheated regions is always superior to that with predominance of columnar region. Modification of some of the ASME II Part C standards relating to the specification of welding consumables is recommended for improved consistency with ASME VIII code for boiler and pressure vessel fabrication.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Multipass welded joint showing different regions produced at the weld metal. Schematic: (a). columnar region of the last weld bead; (b) reheated zone, coarse grained; (c) reheated zone, fine grained; and (d) underbead columnar region.

Grahic Jump Location
Figure 2

Position of impact Charpy V at the all weld metal joint for the two series of testing performed. (a) and (b) First series of tests, specimens removed with one face within 4.5 (a) and 1.6mm (b) from the plate surface. (c) and (d) Second series of tests, specimens removed with one face 1.6 (c) and 8mm (d) from the plate surface.

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Figure 3

Impact Charpy V curves for the first series of testing. Specimens 10×10mm. Left: one face within 4.5mm from the plate surface, right: one face within 1.6mm from the plate surface.

Grahic Jump Location
Figure 4

Impact Charpy V curves for the second series of testing. Specimens 10×5mm. Left: one face within 8mm from the plate surface; right: one face within 1.6mm from the plate surface.

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