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Mechanical properties as criteria for assessing the reliability of welded joints

Authors
  • Heuser, Albert
  • Koivula, Jouko
Publication Date
1984
Source
VTT Publications Register
Keywords
License
Unknown

Abstract

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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