Experimental and numerical investigations were conducted to qualify dissimilar girth welds in tubes fabricated in 9% Chromium steels T91 and E911 and the austenitic steel X3 CrNiMoN 17-13 for service temperatures up to 625°C [1]. Girth welds were produced on tubes by different welding processes such as automatic and manual TIG welding as well as friction welding. Ni-based consumables (NiCr20Nb) were used in the arc welding processes and NiCr15Fe transition rings in case of friction welded joints. The girth welds were investigated in the annealed as well as in the quenched and tempered post weld condition. The tubes were tested under combined cyclic thermal and mechanical loading [1]. A full material characterization (tensile tests at different strain rates, creep tests, low cycle fatigue tests at temperatures up to 650°C) for base metals and weld metals as well as weld thermal simulated heat affected zones were performed. This data was used to apply a non-isothermal viscoplastic Chaboche-type material model. This model describes primary, secondary and tertiary creep as well as the softening and hardening during cyclic loading. The viscoplastic model was implemented in the finite element code ABAQUS. Each material zone (base metals, three different heat affected zone materials, weld metal) was treated separately. Various finite element simulations were performed to analyze and predict the in-service behavior of the welded tubes. The comparison of long term laboratory tests with these predictions are promising.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4674-1
PROCEEDINGS PAPER
Dissimilar Girth Joints Under Combined Cyclic Thermal and Mechanical Loading: Experimental and Numerical Investigations Available to Purchase
Ralf Mohrmann,
Ralf Mohrmann
Fraunhofer-Institut fu¨r Werkstoffmechanik, Freiburg, Germany
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Vale´rie Denner,
Vale´rie Denner
Fraunhofer-Institut fu¨r Werkstoffmechanik, Freiburg, Germany
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Thomas Hollstein
Thomas Hollstein
Fraunhofer-Institut fu¨r Werkstoffmechanik, Freiburg, Germany
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Ralf Mohrmann
Fraunhofer-Institut fu¨r Werkstoffmechanik, Freiburg, Germany
Vale´rie Denner
Fraunhofer-Institut fu¨r Werkstoffmechanik, Freiburg, Germany
Thomas Hollstein
Fraunhofer-Institut fu¨r Werkstoffmechanik, Freiburg, Germany
Paper No:
PVP2004-2657, pp. 133-137; 5 pages
Published Online:
August 12, 2008
Citation
Mohrmann, R, Denner, V, & Hollstein, T. "Dissimilar Girth Joints Under Combined Cyclic Thermal and Mechanical Loading: Experimental and Numerical Investigations." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Residual Stress, Fracture, and Stress Corrosion Cracking. San Diego, California, USA. July 25–29, 2004. pp. 133-137. ASME. https://doi.org/10.1115/PVP2004-2657
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