Investigation of dissimilar metal welds by energy-resolved neutron imaging

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dc.contributor.authorTresmin, Anton S.
dc.contributor.authorGanguly, Supriyo
dc.contributor.authorMeco, Sonia
dc.contributor.authorPardal, Goncalo
dc.contributor.authorShinohara, Takenao
dc.contributor.authorFeller, Bruce
dc.date.accessioned2016-07-06T13:39:50Z
dc.date.available2016-07-06T13:39:50Z
dc.date.issued2016-06-09
dc.description.abstractA nondestructive study of the internal structure and compositional gradient of dissimilar metal-alloy welds through energy-resolved neutron imaging is described in this paper. The ability of neutrons to penetrate thick metal objects (up to several cm) provides a unique possibility to examine samples which are opaque to other conventional techniques. The presence of Bragg edges in the measured neutron transmission spectra can be used to characterize the internal residual strain within the samples and some microstructural features, e.g. texture within the grains, while neutron resonance absorption provides the possibility to map the degree of uniformity in mixing of the participating alloys and intermetallic formation within the welds. In addition, voids and other defects can be revealed by the variation of neutron attenuation across the samples. This paper demonstrates the potential of neutron energy-resolved imaging to measure all these characteristics simultaneously in a single experiment with sub-mm spatial resolution. Two dissimilar alloy welds are used in this study: Al autogenously laser welded to steel, and Ti gas metal arc welded (GMAW) to stainless steel using Cu as a filler alloy. The cold metal transfer variant of the GMAW process was used in joining the Ti to the stainless steel in order to minimize the heat input. The distributions of the lattice parameter and texture variation in these welds as well as the presence of voids and defects in the melt region are mapped across the welds. The depth of the thermal front in the Al–steel weld is clearly resolved and could be used to optimize the welding process. A highly textured structure is revealed in the Ti to stainless steel joint where copper was used as a filler wire. The limited diffusion of Ti into the weld region is also verified by the resonance absorption.en_UK
dc.identifier.citationTresmin et al. (2016) Investigation of dissimilar metal welds by energy-resolved neutron imaging, Journal of Applied Crystallography, Vol. 49, Iss. 4, pp1130-1140en_UK
dc.identifier.cris14709454
dc.identifier.issn0021-8898
dc.identifier.urihttp://dx.doi.org/10.1107/S1600576716006725
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/10101
dc.language.isoenen_UK
dc.publisherInternational Union of Crystallographyen_UK
dc.rightsAttribution 2.0 Unporteden_UK
dc.rights.urihttp://creativecommons.org/licenses/by/2.0/
dc.subjectNondestructive testingen_UK
dc.subjectLaser weldingen_UK
dc.subjectDissimiliar joiningen_UK
dc.subjectMicrostructureen_UK
dc.subjectNeutron imagingen_UK
dc.titleInvestigation of dissimilar metal welds by energy-resolved neutron imagingen_UK
dc.typeArticleen_UK

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