Abstract
In the United Kingdom, The Welding Institute has pioneered the application of the COD design curve. This paper is a representation of the philosophy underlying design curve applications and illustrates the practical significance of COD by drawing on case studies from various welded structures. Following a brief appraisal of the origins of the design curve, the paper outlines procedures for the use of COD in design. The reliability of a small scale test prediction from the design curve has been investigated on a statistical basis from a survey of more than seventy wide plate tensile test results in which the material had also been categorised by COD. Specific practical examples are then discussed covering the various types of applications, namely, material selection, defect assessment and failure investigation.
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