SYMPOSIA PAPER Published: 01 January 1993

Influence of Stress State and Specimen Size on Creep Rupture of Similar and Dissimilar Welds


Small-scale tension specimens taken transversely from similar weldments of 12% Cr steel as well as small- and large-scale specimens from dissimilar weldments of 12% Cr/1% CrMoV with 12% Cr deposit were tested to obtain creep rupture data at 550°C. For the similar weld, the rupture time of the specimens was considerably longer than the rupture time determined in uniaxial creep tests of the weakest heat-affected zone (HAZ) microstructure. Results of finite element analyses have shown that this is caused by a constraint imposed on the weakest HAZ by the surrounding microstructures with higher creep strength. For the dissimilar weld, the creep rupture strength of large-scale specimens is higher than that of small-scale specimens. Finite element analyses have shown differences in the stress states developing in small- and large-scale specimens, which lead to different rupture times.

Author Information

Kussmaul, K
Staatliche Materialprüfungsanstalt (MPA), Stuttgart 80, Germany
Maile, K
Staatliche Materialprüfungsanstalt (MPA), Stuttgart 80, Germany
Eckert, W
Staatliche Materialprüfungsanstalt (MPA), Stuttgart 80, Germany
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Developed by Committee: E08
Pages: 341–360
DOI: 10.1520/STP18036S
ISBN-EB: 978-0-8031-5229-8
ISBN-13: 978-0-8031-1481-4