Numerical and Experimental Determination of the Residual Stress State in Multipass Welded API 5L X70 Plates*

Nuriya Garipova; Caner Batigün; Cemil Hakan Gür

doi:10.3139/120.110637

Article

Numerical and Experimental Determination of the Residual Stress State in Multipass Welded API 5L X70 Plates*

Nuriya Garipova , Caner Batigün and Cemil Hakan Gür

Published/Copyright: October 11, 2014

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From the journal Materials Testing Volume 56 Issue 10

Abstract

Residual stress distributions in multipass welded API 5L X70 steel plates were determined by numerical and experimental methods. SYSWELD finite element software was used for numerical simulations. Microstructure variations were also considered for calculation of residual stresses. The continuous cooling transformation diagram was obtained via JMatPro software. The results showed that residual stress distribution is sensitive to number of weld passes, and microstructure changes. The simulation results were compared with those obtained by Magnetic Barkhausen Noise measurements on the welded plates. Simulation and experimental results gave qualitatively similar tendencies for the variation of the residual stress state.

Kurzfassung

Die diesem Beitrag zugrunde liegende Forschungsstudie beschäftigt sich mit einem rechnerischen Ansatz zur Eigenspannungsentwicklung und deren Verteilung mittels Finite-Elemente-Analyse (FEA). Hierzu wurden anfangs die Temperaturfelder berechnet und mittels der experimentell bestimmten Temperaturen validiert. In der Fortführung wurden die entsprechenden Eigenspannungsfelder für jede Lage numerisch simuliert und zu einem Gesamtbild zusammengefügt. Die mikrostrukturellen Veränderungen in Verbindung mit den verschiedenen Streckenenergien und Schweißlagen wurden ebenfalls berücksichtigt. Die berechneten Ergebnisse wurden mit experimentellen Messungen der Eigenspannungen unter Verwendung der Barkhausenrauschen-Technik verglichen. Die Ergebnisse zeigen, wie sensitiv die Eigenspannungsverteilung bezüglich der Kombination der Schweißlagen, der Schweißparameter und der Einspannbedingungen ist. Daraus lässt sich entsprechend schließen, daß die optimalen Kombinationen der relevanten Parameter, ebenso wie die entsprechenden Grenzen klar definiert werden müssen.

**Correspondence Address Dr. Caner Batigün, Middle East Technical University, Welding Technology and Nondestructive Testing Research and Application Center, Üniversiteler Mahallesi, Dumlupinar Bulvari No. 1, 06800 Çankaya Ankara, Turkey, E-mail: bgun@metu.edu.tr

Nuriya Garipova Kilic, born 1979, achieved her Welding Engineer at Ufa in Russia. She is a PhD student in the Metallurgical and Materials Engineering Department at Middle East Technical University in Ankara, Turkey. Her current studies focus on the modeling of weld residual stresses.

Dr. Caner Batigün, born 1967, is Metallurgical and Materials Engineer and International Welding Engineer. He is currently a researcher in the Welding Technology and Nondestructive Testing Research and Application Center at Middle East Technical University, Turkey. His current studies focus on modeling of weld distortion as well as hot cracking phenomena in welding.

Prof. Dr. Cemil Hakan Gür, born 1965, is Metallurgical and Materials Engineer and Nondestructive Testing Expert (Level III). He is Head of the Metallurgical and Materials Engineering Department and Head of the Welding Technology and Nondestructive Testing Research and Application Center at Middle East Technical University, Turkey. His current studies focus on the residual stresses, non-destructive testing, non-destructive materials characterization.

Presented during the 3^rd International Conference on Welding Technologies and Exhibition (ICWET'14) in Manisa, Turkey

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Published Online: 2014-10-11

Published in Print: 2014-10-01

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https://doi.org/10.3139/120.110637