The Effect of Closure Weld Thermal Cycles on the Evolution of Residual Stresses at the Dissimilar Metal Weld-buttering Interface of Forged C

DOI

Cr-Mo steel forgings are used in oil and gas components to provide flow control and protection against over-pressure. Joining forgings to flow line requires 2 steps: Dissimilar metal weld-buttering layer deposited to forging in-shop followed by post-weld heat-treatment (PWHT); then a closure weld is made in-field joining the weld-buttered layer to pipe steel and no PWHT is done. As PWHT is completed in step 1 reducing residual stress, further thermal cycles from closure weld will increase stress at the forging-weld-buttering interface. Studies report failure at interface from damaging microstructure and hydrogen up-take. However, quantification of residual stress at the interface was not studied, nor contribution to cracking determined. This proposal aims to quantify the effect of closure weld thermal cycles on the evolution of residual stresses at the forging-weld-buttering interface.

Identifier
DOI https://doi.org/10.5286/ISIS.E.61095575
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/61095575
Provenance
Creator Dr Mark Callaghan; Professor Philip Withers; Dr John Francis; Dr Saurabh Kabra
Publisher ISIS Neutron and Muon Source
Publication Year 2018
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Construction Engineering and Architecture; Engineering; Engineering Sciences
Temporal Coverage Begin 2015-04-26T00:00:00Z
Temporal Coverage End 2015-07-20T09:29:36Z