Abstract
Details of how to draw up realistic acceptance levels for defects using the principles of fracture mechanics are given for two engineering situations: steel castings and welds. In steel castings critical defects turn out to be so large that radiography could be discontinued provided some ultrasonic inspection is carried out. In welds critical flaw sizes are much smaller and careful inspection using ultrasonics to locate and measure cracks will be needed to operate any realistic acceptance standard. To draw up standards such as these a sound knowledge of the principles of fracture mechanics and current ndt techniques is essential. When this knowledge is more widely dispersed many organisations will be able to set more realistic standards which, in many cases, will eliminate some of the time-consuming and expensive inspection procedures now carried out.
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