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ReasonAnalysisonCrackingoftheFilletWeldingSeamofthe£¶£¶£°MWHighPressureHeaterNozzleRENXiaohu,CHENMing,XIEXiaoyuan,PENGFangfang,XIAODongping
(DongfangBoilerGroupCo£®,Ltd£®,DongfangElectricCorporation,Deyang£¶£±£¸£°£°£°,China)
Abstract:Thefilletweldingseamofthe£¶£¶£°MWhighpressureheaternozzlecrackedandthecracksextendedtothebase materialofthecylinderintheprocessofwelding£®Theweldseamwasexaminedbymacrographicexamination,hardnesstesting,metallographicexamination,scanningelectronmicroscopeandenergyspectrumanalysistoanalyzethecrackingreasons£®Theresultsshowthat:theformationwasbadatthefilletweldrootofthenozzleandcylinder,andtherewereweldingdefectssuchasslag,porosityandsoon;undertheactionofweldingstressandstructuralrestraintstress,stressconcentrationgeneratedonthepositionofweldingdefects,whichledtocrackinitiationandpropagation£®Theintegralforgingschemewhichmatchedwiththerepairinggapofthecylinder
wasadopted,andtheforgingstrengthcalculationcouldmeetthedesignrequirementsandtherepairhadbeensuccessfullydoneatthefirsttry£®
Keywords:highpressureheater;nozzle;filletweldingseam;crack;defect;repair
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