自保护药芯焊丝焊缝中的气体

:2006-03-241,1,1,2(1.,100081;2.,065000):N0.025%0.035%(),,220280A,1824V,2030mm,CO,CO2:;;:TG422.3:A:0253-360X(2007)02-067-050,,,,,,,,,,,,,:(1)CO2CO(Al,Ti,Si,Mg),,,(2),,,,,,,S,O,N,P,Cu,Sn,P,P,,,,(3),1,,,,,[1],0.08%0.228%;,0.01%0.04%;ArCO2,0.02%0.03%;,0.01%;0.015%0.04%;,0.12%ELTERN0.025%0.035%,(1)(2),,,[2]28220072TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.28No.2February2007N2(g)vN+N(1)(3),NO,NO[3]N2+O2v2NO(2)NOvN+O(3)NONO+FevN+FeO(4)(4),,,(4),,[4]N2vN+N++e-(5),LakomskiGrigorenko[5],,30000,,,,NO,2,,()2.1,,,300mm,11Table1Influenceofcarbonatecontentonporosityinweld(%)4812162024n70058151,,,8%12%,:(1)CO2,,(2)NO,NO(4)CO2,,(3)CO2,,,(4)CO2,,,,(5)CO2,NO,,(6),,(7),,,,;,,,,,2.2,,,,,[6]P,,,Ca+2LiFvCaF2+2Li(6)N+3LivLi3N(7),,,,,,6828CaF2+12O2vCaO+F2(8),,,22,45%,,;,P,45%55%2Table2Influenceoffluoridecontentonporosity(%)4045505560n1100032.3,,,11,Al0.55%,,:(1);(2);(3),Al0.55%1Fig.1EffectsofAlcontentinweldonporosity,,,,,,,3,,180300A,1826V,20mm,20mPh,22Fig.2Effectsofweldingvoltageandcurrentonporosity2,(180A),,,,,:(1),,;(2),,,;(3),,;(4),,,,,,,,,,,,2,:69,300A,(18V),,2,,,26V,,,,;,,,,,,,,224V,300A26V,300A,,,,,,220280A,1824V20V,240A,3,(510mm),,,,,CO2,,2030mm3Fig.3Effectofstick2outofwireonweldporosity,[7],2.4mm,,N0.01%Verhagen[8],2,22V,,,44,,1,,(5)N+,,,N+,4Fig.4Effectofpoleonweldporosity,,220280A,1824V,2030mm,4,,,,8%12%,45%55%,Al0.55%,,,,;,220280A,1824V;[74]70288ARrzA,,(50mm),(30mm),,,,A;,A,8AFig.8RelationbetweenresidualstressRrzanddifferentheatingarea4(1),;,(2),,,,,,,:[1].[J].,2002,18(5):38-41.[2].[J].,1999,15(5):43-45.[3]SchweigertF.Thedevelopmenttendencyoffrancishydraulicturbine[J].JournalofHydraulicResearch,1986(3):18-22.[4].[J].,1997,16(3):64-65.[5].[J].,1999(3):33-34.[6],,.[J].,1999,10(3):78-80.:,,1977,,,20Email:[e-mail][70]2030mm;,CO2:[1].[M]...:,1977.[2]KaplanHI,HillDC.Thermodynamicsofairoperatingfluxcoredelectrodesandananalysisofweldtoughness[J].WeldingResearch,1976,55(1):13s-19s.[3]KrivenkoLF,SlutskayaTH.Effectsofalloyingelementsonthere2sidualnitrogencontentoftheweldmetalafteropenarcwelding[J].AutomaticWeld,1967,20(3):12-14.[4]BlakePD.Nitrogeninsteelweldmetals[J].MetalConstruction,1979,11(4):196-197.[5]LakomskiVJ,GrigorenkoGM.Absorptionofhydrogenandnitrogenbythemetalduringarcwelding[J].AutomiticWelding,1964,17(11):1-9.[6]CunatPJ.Fluxcoredarcweldingwithoutexternalshielding[J].SoudageetTechniquesConnexes,1981,35(9-10):319-324.[7]KobayashiT.Someaspectsofadvancesinthescienceofwelding[J].WeldingintheWorld,1973,21(11):227-236.[8]VerhagenJG.Nitrogenabsorptionbyferriticweldmetalduringarcwelding[J].MetalConstruction&BrutushWeld,1970,2(4):135-143.:,,1971,,20Email:[e-mail]74289.5%morethanFe-Cr-Chardfacingalloy.Andtherelativeabrasionwear2resistingpropertyofNbCstrengthenedFe-Cr-Chardfacingalloyincreased60%comparingtotheFe-Cr-Chard2facingalloy.ThecrossshapeofNbChardphaseinFe-Cr-C-NbCalloyiserose,showingasrhombicorpolygonalshapedistribut2edbetweentheM7C3orembedintheM7C3.ThedistributionofNbCphaseisnotuniform,anditcongregatesinlocalregions.Theeutec2ticcarbidesintheFe-Cr-C-NbCalloyshowcoarsestructurecomparedtotheFe-Cr-Chardfacingalloy,andthespacebetweerthemismuchgreat.Keywords:Fe-Cr-Chardfacingalloy;NbC;abrasionwear2resistingproperty;microstructureDuctiletearingassessmentofsurfaceflawincircumferentialweldofpipe2linebasedonJintegralparameterZHANGManli1,WANGJianping2,TAOYongyin2(11MathsandInformationDepartment,LangfangTeachersCollege,Langfang065000,Hebei,China;21ResearchInstituteofChinaPetroleumPipelineBureau,Langfang065000,Hebei,China).p59-62,66Abstract:Basedonlevelthreeprogramme(ductiletearingassessment)ofassessmentstandardBS7910,ductiletearingassess2mentofsurfaceflawincircumferentialweldofpipe2lineunderpurebendingloadwasproceededbyusingJintegralengineeringestimatemethodofSC.ENG.BytakingX56steelpipelineasanexample,effectsonassessmentcurveandevaluatingresultsweregivenbyflawdimensionandfractureparameterchoosingwerediscussed,andtheassessmentpointwasputforwardthatJmatismorereasonablethanJgindeterminingassessmentpointswhilechoosingJintegralparametertomakeaductiletearingassessmentofflawinmetalstructure.Theresearchresultsarenotonlytakenasaguideonsaftyevaluationinpipelineconstruction,butalsocanmakeengineeringapplicationoftheductiletearingassessmentofstructurewithflawmorepopularandreferentia.Keywords:BS7910;Jintegral;circumferentialweld;sur2faceflaw;ductiletearingassessmentCharacteristicofinterfacemicrostructureinjointbetweencop2peralloyand35CrMnSiAsteelLVShixiong,YANGShiqin,WANGHaitiao,XUEChengbo(StateKeyLaboratoryofAdvancedWeldingProductionTechnology,HarbinInstituteofTechnology,Harbin150001,China).p63-66Abstrat:Theshellstructureconsistingofcopperalloysur2facinglayerandsteelsubstratewasproducedbyacool2bodytungsteninertgassurfacingmethod,andmicrostructureoftheshellwasmain2lyinvestigated.Characteristicsofmicrostructureandmorphologyofinterface,copperalloylayerandsteelsubstratewereobservedbyus2ingopticalmicroscope,scanningelectronmicroscope.EffectsofweldingprocessonthecontentofFewithinthecopperalloywereal2soanalyzed.EnergydispersiveX