Session: MF-03-01: Welding Residual Stress and Distortion Simulation and Measurement - 1

Paper Number: 85083

85083 - NeT Project Task Group 8 – An International Benchmark on Residual Stress Assessment for Welding Repair 

NeT project Task Group 8 – An international benchmark on residual stress assessment for welding repair

 

V. Robin^a,b, S. Hendili^a, J. Delmas^a, J. Draup^c Q. Xiong^c,d, M.C. Smith^d, A. Paget^d

a EDF R&D, 6 Quai Watier, 78400 Chatou, France

e-mail: vincent.robin@edf.fr, sofiane.hendili@edf.fr, josselin.delmas@edf.fr

b EDF Direction Technique, 19 rue Pierre Bourdeix, 69007 Lyon, France

e-mail: vincent.robin@edf.fr, sofiane.hendili@edf.fr, josselin.delmas@edf.fr

c EDF Energy, UK Center, University of Manchester, George Begg Building, Manchester, M13 9PL, UK

                                                          e-mail: e-mail: jefri.draup@edfenergy.com

d University of Manchester, ,George Begg Building, Manchester, M13 9PL, UK

               e-mail: qingrong.xiong@manchester.ac.uk, mike.c.smith@manchester.ac.uk, alexandre.paget@manchester.ac.uk

 

 

ABSTRACT

 

Within NeT project [1], Task Group 4 is a unique test bed for the development and validation of weld residual stress simulation techniques in austenitic stainless steel. Its combination of extensive materials characterization, accurately characterized welding temperature transients, and reliable residual stress and distortion measurements is currently unrivalled. About thirty finite element simulations were submitted to the network over the course of the project, giving insights into the required accuracy of welding thermal solutions, the mechanical solution accuracy achievable using optimized material constitutive models, and the level of acceptable error in finite element residual stress simulation results for use in structural integrity assessments of high integrity engineering component. Base on the success of Task Group 4, a new Task Group TG8 has been organized to address welding repair issues.

The Task Group 8 (TG8) round robin specimen is closely based upon the TG4 designs, except the thickness that is increased up to 30 mm for more self-clamping conditions and to reduce distortions. It thus presents all the advantages and challenges of the TG4 specimens, namely, the generation of a complex 3D residual stress distribution in a compact, portable specimen that is amenable to rapid measurement of residual stresses by diverse techniques, with a significant volume of weld metal that undergoes multiple high temperature thermo-mechanical cyclic loads. The use of nickel-based alloys for filler metal adds considerable residual stress measurement challenges, while this configuration undergoes a complex mismatch behaviour with the base metal where phase transformations and tempering effects occur in the Heat Affected Zone. Results and prospects of the first phase of this round robin are presented.

 

[1]        https://www.net-network.eu/

Presenting Author: Vincent Robin EDF

Presenting Author Biography: Since 2016, Vincent ROBIN is an expert research engineer working for different projects related<br/>to manufacturing and repair for nuclear power plant equipment at EDF Group Research<br/>Center. These research activities concern the understanding of physical phenomena involved<br/>during material processing and the assessment of consequences on equipment fitness for service. Material characterization, process monitoring and simulation of manufacturing processes are the main topics of interest applied to : ingot casting, forging and heat treatment, arc welding and repair, additive manufacturing and surfacic mitigation processes. Vincent ROBIN is a graduated engineer in mechanical engineering since 1998. He obtained<br/>a PhD in 2009. This R&amp;D work was prepared at the same time than its professional activity which started in 1998. The title of the thesis is “From the numerical modeling of manufacturing processes and welding in particular to the mechanical behavior of weldments”. After ten year of working in the field of scientific software development for manufacturing process and fracture mechanics simulation at ESI Group within the framework of R&amp;D projects and industrial studies for different part of the industry (nuclear power, transportation,<br/>defense…), he decided to work more intensively for the nuclear industry. Since 2008 he has been working for Framatome (formerly AREVA Nuclear Power) in the mechanical engineering department as a numerical simulation specialist. He was expert in the manufacturing domain and in charge of R&amp;D projects in the field of fabrication (e.g. welding, machining, additive manufacturing…), fracture mechanics and materials. In 2016, he has joined<br/>EDF Group Research Center as an expert research engineer working for different projects related to manufacturing and repair for nuclear power plant.

Authors:

Vincent Robin EDF
Josselin Delmas EDF
Sofiane Hendili EDF
Jefri Draup EDF Energy UK Center
Alexandre Paget University of Manchester
Mike Smith University of Manchester
Qingrong Xiong University of Manchester