Abstract
In steel welded joint zones microcracks appear very easily, so the study of the fatigue crack growth rate in the welds is very important. To evaluate the fatigue characteristics in welded joints and in the heat affected zone of WDL610D steel, the fatigue crackgrowth rates were obtained through testing ofcompac ttension specimens. Fatigue crack growth rates with probabilities of 97.73% are given. The fatigue crack growth rates of two zones are compared. Also the results are compared with the formula in the ‘Safety assessment code of pressure vessels with flaws in service’ and the recommendations in the standard BSI PD6463. The results show that fatigue crack growth rates in the WDL610D steel are slower than that in the currently used 16MnR steel within the allowable range.
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