Assessments of fracture resistance in welded steel structures normally involve the measurement of thoughness in at least three regions. These are the parent material, weld HAZ and weld metal. The weld HAZ presents difficulties in toughness measurement owing to its narrow width; for example, in carbon-manganese steels welded at arc energies typical of those used in the quality fabrication industry the transformed HAZ will usually be no more than 3 to 4 mm wide. Within this distance there is a very wide range of microstructures and properties so that the region of importance may only be about 1 mm wide. Very few procedure test specifications are written so as to ensure that such small regions are sampled. This paper describes the metallurgy of weld heat affected zones (HAZs) in carbon-manganese microalloyed steels and methods by which their resistance to fracture initiation can be evaluated. The significance of brittle regions within the HAZ are discussed primarily with regard to ensuring structural integrity by avoiding fracture initiation.
Fracture thoughness of weld heat affected zones (HAZs) in steels used in constructing offshore platforms
Bruchzaehigkeit der Waermeeinflusszonen von Staehlen fuer Bohrplattformen
1984
14 Seiten, 7 Bilder, 15 Quellen
Conference paper
English
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