Failure of welded radiator nipples caused by nonmetallic inclusions

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dc.contributor.authorElkoca O.
dc.contributor.authorCengizler H.
dc.date.accessioned2024-07-22T08:22:30Z
dc.date.available2024-07-22T08:22:30Z
dc.date.issued2007
dc.description.abstractA splitting phenomenon in the weld zone of the radiator nipples was encountered after a threading operation. During the failure analysis, some oxide traces were macroscopically observed on the surfaces of unthreaded nipples. Subsequent scanning electron microscopy-x-ray spectrometer (SEM-EDS) examination through the surfaces of the unthreaded nipples and as-pickled steel sheet coupons that were used for nipple manufacturing revealed that the oxide traces were hot-rolling scale residuals. However, none of the traces of scale residuals were encountered on the cross sections of weld zone of unthreaded nipple samples. Contrarily, some cracks and inclusion residuals were observed through the interface between the protrusion and weld zone. EDS analysis and optical microscopy affirmed the presence of MnS-type inclusions. The same kind of inclusions was also observed when one of the unthreaded nipples was intentionally separated through the weld zone. In conclusion, the main cause for the failure was determined to be the adverse effect that the MnS inclusions in the steel had on the material ductility. © ASM International 2007.
dc.identifier.DOI-ID10.1007/s11668-007-9073-x
dc.identifier.issn15477029
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/19109
dc.language.isoEnglish
dc.subjectCracks
dc.subjectDuctility
dc.subjectFailure analysis
dc.subjectInclusions
dc.subjectScale (deposits)
dc.subjectSteel sheet
dc.subjectWelds
dc.subjectRadiator nipples
dc.subjectScale residuals
dc.subjectThreading operation
dc.subjectRadiators
dc.titleFailure of welded radiator nipples caused by nonmetallic inclusions
dc.typeArticle

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