Mechanical properties as criteria for assessing the reliability of welded joints

Albert Heuser, Jouko Koivula

Research output: Book/ReportReportProfessional

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.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages44
ISBN (Print)951-38-1963-9
Publication statusPublished - 1984
MoE publication typeD4 Published development or research report or study

Publication series

NameTiedotteita / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume280

Fingerprint

Fracture mechanics
Welds
Mechanical properties
Heat affected zone
Metals
Compressive stress
Superconducting transition temperature
Fracture toughness
Residual stresses
Steel

Keywords

  • high strength steels
  • weld toughness
  • ductility
  • welded joints
  • strength

Cite this

Heuser, A., & Koivula, J. (1984). Mechanical properties as criteria for assessing the reliability of welded joints. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tiedotteita, No. 280
Heuser, Albert ; Koivula, Jouko. / Mechanical properties as criteria for assessing the reliability of welded joints. Espoo : VTT Technical Research Centre of Finland, 1984. 44 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 280).
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Heuser, A & Koivula, J 1984, Mechanical properties as criteria for assessing the reliability of welded joints. Valtion teknillinen tutkimuskeskus. Tiedotteita, no. 280, VTT Technical Research Centre of Finland, Espoo.

Mechanical properties as criteria for assessing the reliability of welded joints. / Heuser, Albert; Koivula, Jouko.

Espoo : VTT Technical Research Centre of Finland, 1984. 44 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 280).

Research output: Book/ReportReportProfessional

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AU - Koivula, Jouko

PY - 1984

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AB - 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.

KW - high strength steels

KW - weld toughness

KW - ductility

KW - welded joints

KW - strength

M3 - Report

SN - 951-38-1963-9

T3 - Tiedotteita / Valtion teknillinen tutkimuskeskus

BT - Mechanical properties as criteria for assessing the reliability of welded joints

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ER -

Heuser A, Koivula J. Mechanical properties as criteria for assessing the reliability of welded joints. Espoo: VTT Technical Research Centre of Finland, 1984. 44 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 280).