Abstract
This paper summarises an internationally funded assessment of the low temperature fracture toughness requirements of the British Standards Institution Document BS5500:1976, ‘Specification for unfired fusion welded pressure vessels’. The assessment was based on an analysis of wide plate brittle fracture tests, supporting chemical compositions and small-scale mechanical test data from worldwide sources, all these data having been collated in a programme of work involving The Welding Institute (UK), Gent University Research Centre of Welding (Belgium) and Delft University of Technology Metallurgical Department (Netherlands). The assessment showed that the BS5500 requirements are generally safe. However, attention is drawn to the relatively few wide plate test data that are available for section thicknesses less than 25 mm.
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