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NiCo1,2,2,1(1.,210018;2.,243002):CO2,NiHÊgan¾sCo,(EDS)(TEM)XCo,,-Co,-Co+Cr23C6;,,;:;;;:TG174.44:A:0253-360X(2002)06-17-040Co,,,,,,[1,2],,,,,[3],Co,Co[4]Co,,,HÊgan¾sCo,11.1HÊgan¾sHMSP:2002-06-17:(2002009);(01088013)2537(,%):0.4C-1.2Si-25.4Cr-3.0Fe-8.0W-0.8Mn,Ni;Co(,%):1.1C-28.7Cr-1.2Si-4.5W-0.5Fe-0.9Ni,Co100mm60mm10mm,TJ-HL-T5000CO2,,,Co,,,:1950W,120mm/s,4.5mm,2.5mm,6g/min,30%Ar1.2,OLYMPUSPME-3PHLIP-XL30;H-800;XD-3AX22.1236200212TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.23No.6December2002©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:CuKa,40kV,30mA1bcTEM,:20kV,L=0.8m,-CoCr23C61Fig.1Phasecompositionoftheclad-Co417,Co-Co,,Co-CoCo,-Co,M7C3[5]2.22:(1),[6]:,(2),2a,,,,(3),2b(4),2b,2c2Fig.2Microstructureofclad2.333a,-Co,3b,,,/,-Co,,,3c,1Spectrum3-Co,Spectrum124,CCrWFe-Co,-CoCo;CCrWTEMCr23C6a=1.10329nma=1.0659nm,3.1823©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(,%)Table1EDSmicroanalysisresultsofcladSpectrumCCrFeCoWDendrite0.1925.00.5365.83.96Interdendrite1.6729.30.4754.46.184TEM-Co,:(0.30.8m),3a;,4a;,4b,-Co,-Co,,,,1/,,,;[7],Cr23C6,4TEMFig.4TEMmorphologyofeutecticandprecipitateoftheclad5ab,[8],Ni(4%20%)5Fig.5Sub2structureofclad-Co,,,,,,,;,6,:NiCo19©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(G/V)-Ni-Co,[100],,,,,,:,,,,,,,,,[100],,,,,,4(1)CoWCr23C6-Co,-Co+Cr23C6;;Cr23C6(2)(3):,,-Co;(4),:[1],,,.[J].,2002,23(1):5760.[2]RJendrzejewskia,ACondeb,JDeDamboreneab,etal.Characterisa2tionofthelaser-cladstellitelayersforprotectivecoatings[J].Materi2alsandDesign,2002,23:8388.[3]ShepelevaL,MedresB,KaplanWD,etal.Lasercladdingoftrubineblades[J].SurfaceandCoatingsTechnology,2000,125:4548.[4]ZhangSong,ZhangChun2hua,MANHau2chung,etal.Wearresis2tanceandhotcorrosionbehavioroflaserdladdingCobasedalloy[J].Trans.NonferrousMet.Soc.China,2002,11(6):838842.[5],,.Co2Cr-Ni[J].,1995,23(12):8185.[6]AnaSofiaCMDOliveira,PauloSergioCPdaSilva,RuiMCVilar.MicrostructuralfeaturesofconsecutivelayersofStellite6depositedbylasercladding[J].SurfaceandCoatingsTechnology,2002,153:203209.[7]KurzW.FundamentalsofSolidification3rdrevisededition[M].Switzerland:TransTechPublication,1989.9496.:,1966,,,,,,7Email:limingxi66@yahoo.com.cn2023©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(DepartmentofMechanicalEngineering,SoutheastUniver2sity,Nanjing210018,China),HEYi2zhu,SUNGuo2xiong.p1720Abstract:DefectfreecoatingsofHjganÝsCo2basednon2self2fluxingal2loydepositedbycrosscurrentCO2laseronNi2basedsuperalloyareintroduced.Sectionandremeltedzonebetweentwotracksofthecoatingshavebeenexam2inedtorevealtheirmicrostructureandphasecompositionusingopticalmicro2scope,SEM(includingEDSmicroanalysis),XRDandTEM.Theresultsshowedthattherewereprimaryphase(2Co)andeutectic(2Co+Cr23C6)inthecoatings.Rapiddirectionalsolidificationwasfoundattheinterfacewherethegrowthdirectionwasperpendiculartotheinterface.Multi2orientationanddirectionparallelingtothescanningspeedwerealsofoundatthecenterareaandnearthetopsurfacecorrespondingly.Anovelmicrostructurewasfoundtotransmitthecrystallizationdirectionofthefirstlayerattheremeltedboundarybetweentwotracks.Keywords:lasercladding;Co2basedalloy;microstructure;crystalliza2tiondirectionResearchonWeldingProductionManagementBasedonDataMiningZHANGChun2hua(SouthChinaUniversityofTechnology,Guangzhou510641,China),LIDi.p2124Abstract:Withthedevelopmentofautomatizedandflow2lineweldingproduction,highrequirementonqualitycontrolandmanagementhasbeenputforward.Inordertodiscoverlatentrulesandtendencyandprovidedecision2supportfromlargehistoricalproductiondata,dataminingisintroducedtoweldingfieldandthemanagementplatformisdevelopedbasedonon2linemonitoringplatformanddatabase.Atthesametime,thedataispre2processedanddatamarketisbuiltsoastoobtainvaliddataminingmodel.Controlchartisadoptedtocontrolweldingproductionandwastersanddecisiontreeisusedtoanalyzefactorsleadingtodefects,whichobtainsignificanceforweldingpro2duction.Keywords:datamining;weldingproduction;decision2support;man2agementWeldingofRailwayRailandHighManganeseSteelFrog(Paper)GUOMian2huan(NationalKeyLabofAdvancedWeldingProductionTechnol2ogy,HarbinInstituteofTechnology,Harbin150001,China),WANGRu2chun,WANGFu,ZHANGWan2hai,WUWei2dong.p2528Abstract:Itisverydifficulttoweldingahigh2carbonsteelrailandahighmanganesesteelfrog,whichisstillaworldwidepuzzle.Onthebaseofpapers,alotofexperimentalinvestigationhasbeendonewhichdealtwiththeweldingofhighmanganesesteelfrog(600mmlong)andhigh2carbonsteel(600mmlong).Atlastsuchtechnologiesasincreasingthethicknessoftheintermediatelayersofthedoublemedia,whollycoveringtheintermediatelay2ers,quenchingthesideintermediatelayersofthehighmanganesesteeltwicewithwaterandsymmetricallyweldinghavebeentakentoweldrailsandfrogsuccessfully.TheProductQualitiesSupervisingandTestingCenterofRailwayAdministr