Fatigue Crack Growth in Welds

Clark [28] for A 533 Gr B Cll carbon steel plate 15 cm thick containing a butt weld. After welding, the plate was given a PWHT at 620 °C for 40 h, followed by furnace cooling. Therefore, it must be assumed that the HAZ properties were restored and residual stresses removed almost entirely. In fact, it can be seen how the FCGR in base metal and HAZ are much the same. The weld metal, instead, behaves much better. FCGR obtained with CT specimens 2 inches (2T-CT) and 

The reason is not known, but it is an experimental result that must be reported. Finally, Fig. 12.25 [27] presents the FCGR, da/dN, measured on aluminum alloy, type 6061-T6, specimens welded by modified indirect electric arc (MEA). The tensile properties of the base material, HAZ and weld metal are shown in Fig. 12.25 [27]. It can be seen how the strength properties of the HAZ are poor compared to that of the weld metal and, in particular, of the base material. Nevertheless, the higher FCGR, da/dN, is that of the weld metal followed by the HAZ and base material. The FCGR, da/dN, obeys to a Paris law relationship Fig. 12.26 

La Vecchia G.M. Metallurgia e saldabilitk. struttura del giunto saldato. istituto italiano della saldatura, IIS, Genova (2008) 

Masubuchi K. Control of distortion and shrinkage in welding. Weld. Res. Counc. Bull. 

UKAEA An Assessment of the Integrity of PWR Pressure Vessels. 2nd Report by Dr. W. Marshall Study Group (1982) 

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Cisilino, A.P., Aliabadi, M.H. Three-dimensional BEM analysis for fatigue crack growth in welded components. Int. J. for Pressure Vessel and Piping 70, 135-144 (1997)... 

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