摘要
The30mmthickASTM4130steelpipewasfabricatedbygastungstenarcweldingandshieldedmetalarcweldingunderquenchedandtemperedconditions.Whereafter,themechanicalpropertiesofweldedjointsofbothVgrooveandcombinationdouble.Vgrooveweremeasured,whilethemicrostructurefeatureandfracturemorphologyofbothweldedjointswereinvestigated.Moreover,theeffectofgrooveshapesonthepropertiesofweldedjointswasexplored.TheresultsshowthattheweldingefficiencyofthecombinationdoubleVgroovejointisastwotimesasthatoftheVgroovejoint.Butthehardnessandtoughnessoftheheat-affectedzone(HAZ)withcombinationdoubleVgroovecannotsatisfytherequirements.Also,thecoarsegrainheat-affectedzone(CGHAZ)ofthecaplayerismainlycomposedofgranularbainite,temperedmartensiteandasmallamountofcarbon-freebainite,andthefracturedsurfaceofthefusionlineisentirelydominatedbythequasi-cleavagemode.ThatthemechanicalpropertiesofthecombinationdoubleVgroovearelowerthanthatoftheVgroovelieinthepenetrationratio,weldingheatinput,andtheareasanddistributionfeatureofbrittlezones.ThecombinationdoubleVgrooveisnotsuitableforthefabricatingofASTM4130steel.
出版日期
2016年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
