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:100225855(2010)0120024203:(1959-),,,,1,1,1,2(11,110142;21,110142),,BS7910;;;:TH134:AEvaluationresearchonweldsafetyforcheckvalveLIUShao2feng1,SHIGui2rong1,DENGBin1,ZHUJie2(1.ShenyangShengshiHighandMediumPressureValveCo.,Ltd,Shenyang110142,China;2.P.L.AMilitaryRepresentativeBureauresidedinShenyang,Shenyang110142,China)Abstract:Analysesweldstressdistributionofcheckvalveundercomplicatedloadconditions;studiesperformancesuchastensileproperties,impactductility,fracturetoughness,fatigueproperty,crackfa2tiguepropagationrateandthresholdvalue,etc,forweldsimulatedspecimens;adoptsthesafetyevalua2tionsystemBS7910usedintheworldtoimplementsafetyqualificationfortheincompletefusionde2fectsexistedintheringweldsofcheckvalve.Keywords:checkvalve;welding;evaluation;check1,,,,,,,,,2,(1)100mm(1),60mm(2),(2)a()c()B()p()W()1a=115mm,c=50mm,2a=115mm,c=30mm14220101(a)(:2aB)(b)(:2cp2aB)(c)(:2caB)(d)(:2caB)(e)(:caB)23,,,,BS7910,330,316485,250,,(12)4,,PmPb,1y,2y()5,1,,,,2,,(1)1225250011112250()()KmatUV01050103117VKmatmatJ(250)CTOD(250)010401311710250JRKmatmat015(250)017(250)----,017250----:,p(F)=110-56BS79108,dadN=A(K)mK=(Y)aY=Mfw(MmPm+MbPb)YMfwMmMbM,PmPb,K,ParisacaNcN,1aN=116mm,cN=5214mm,25220101aN=116mm,cN=3018mm121(3)Sr,Krr,,Krr01707,Sr018,,BS7910712SrKrr,CvJmatCTODKrr,312,BS7910713,LrLrmax=(Y+U)/2YrKr(1-0114Lr2)[013+017exp(-0165Lr6)]Y012%,MPau,MPa,,1,LrKrr,CvJmatCTODKrr),Krr019,Lr1109,7,12,1212,,,,,,1BS7910-1999,S.(:2009107110)(21)3mm8e9c01049872=01089740106962=0113920111652=012330(010696-0100154)2-0101275=011234(011165-0100154)2-0101275=0121724DN40,-196,010158mm,9c8e01026mm,,JB/T9081-19999,1JB/T9081-1999,.(:2009106103)6220101