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Mechanical properties as criteria for assessing the reliability of welded joints

  • Heuser, Albert
  • Koivula, Jouko
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Three proposal are given of how to produce satisfactory precrack fronts to fracture mechanics test speciments of welded joints containing high compressive residual stresses. Weldments on micro-alloyed structural steel StE 460 both in as welded and stress relieved condition were investigated using CT-specimens. The fracture toughness of the coarse grained HAZ and the weld metal were not inferior to that of base metal within the range of heat input (18 - 50 kJ/cm) applied in this study. The last part of the report includes a comparison of a number of transition temperatures obtained from Charpy-V-impact test (TTA max/2), fracture mechanics tests with CT-specimens and sharp notched bend specimen (Tgy, Ti, Ta) and wide plate test. On the assumption that a plate test represents a simple model of a construction it was shown how small scale fracture mechanics tests can be used to predict the behaviour of real structural elements. Finally, there is a discussion on to what extent such consepts as Burdekin & Stone COD design curve or CEGB two criteria approach are able to predict the behaviour of the wide plates.

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