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Residual stress distribution in a Ti-6Al-4V T-joint weld measured using synchrotron X-ray diffraction

DOI: 10.1177/0309324715599462 DOI Help

Authors: Lei Xu (TWI Ltd, Cambridge) , Shu Yan Zhang (ISIS) , Wei Sun (University of Nottingham) , David G Mccartney (University of Nottingham) , Thomas H Hyde (University of Nottingham) , Jon James (The Open University) , Michael Drakopoulos (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Strain Analysis For Engineering Design , VOL 50 (7) , PAGES 445-454

State: Published (Approved)
Published: October 2015
Diamond Proposal Number(s): 7338

Abstract: To improve the manufacturing quality of welded structures, to prevent failures at weld joints and to predict their lifetime, measurements of the residual stresses generated by welding in the structures are extremely useful. The residual stresses may reduce the component life due to phenomena that occur at low applied stresses such as brittle fracture, fatigue and stress corrosion cracking. Welded thin Ti–6Al–4V panel components are commonly found in aero-engine assemblies and the weld integrity and reliability are critical. In this work, the residual stress distributions in a welded thin Ti–6Al–4V T-joint were measured by the newly developed SScanSS program with synchrotron X-ray diffraction technique. The measurement performed in this study, which included a large number of measurement points, has mapped a complete stress field in a thin sheet T-joint weld. It has not only provided improved understanding of residual stress in such a joint but also filled the missing link between the residual stress obtained by numerical modelling and their validation. The results have shown that the longitudinal stresses play the most important role in the residual stress distribution over the flange and high tensile stresses appear in the region near the weld zone. The measured results were compared with the numerically predicted results and these showed good agreement.

Journal Keywords: Ti–6Al–4V T-Joint; Residual Stress; Diffraction; Synchrotron X-Ray; Finite Element

Diamond Keywords: Welding

Subject Areas: Engineering, Materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 31/08/2015 14:20

Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology

Technical Tags:

Imaging Tomography