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Radiography of thin-section welds, Part 2: Modelling

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This paper describes the validation and refinement of a simple model of radiography, first published by Pollitt in 1962, which treats defects as smooth, parallel-sided slots. It builds on similar work, which was presented at NDT'99, on thick-section welds (thickness range 50-114 mm).

The latest experimental data were collected from 12 realistic planar defects in welds of thicknesses 10–50 mm. They were radiographed under various exposure conditions, giving 278 defect/radiograph combinations (supplementing the 308 defect/radiograph combinations already available from TWI's earlier work on thick-section welds). Each radiograph was evaluated ‘blind’ by two radiographers. The specimens were then sectioned to determine defect size, orientation and gape. Part 1 of this paper describes the practical aspects of this work.

The experimental data show variations in detectability that are strongly correlated with theoretical predictions. We have refined Pollitt's original theory, improving the observed correlation with the experimental data. In all cases, the refined theory is either accurate or pessimistic. The broader range of the available experimental data has also enabled us to improve the accuracy of our previously published statistical models for the reliability of radiography. TWI is already using such models to support the continued operation of its clients' plant.
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Document Type: Research Article

Affiliations: 1: TWI, Cambridge CB1 6AL, UK 2: Jacobi Consulting Ltd, London N1 3NL, UK

Publication date: February 1, 2003

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