Abstract
Surface crack tension specimens of Afnor 7020 aluminium alloy (parent metal and weldment) were used to evaluate the residual strength in panels 5 mm thick and 125 mm wide. The reduction in the ultimate tensile strength (UTS) was in the range 9–15% in the parent metal for cracks up to about 4 mm deep. For similar crack depths in weldments the reduction in UTS was in the range 14–30%. The results have a significant bearing on the quality and reliability of welded components that are to be subjected to non-destructive evaluation.
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