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1、外文资料翻译WELDABILITYANALYSISOFQ345STEELLOWSTEELALLOYSTRUCTUREOFWELDABILITYANALYSIS16Mnand15MnVbelongtothelow-alloysteelhotrolledsteel,thesesteelpriceslower,andhassatisfiedthemechanicalpropertiesandprocessingperformance,firstofalltoanalyzethistypeofsteelwelding,weldingontwopointso
2、ftypicallyBianxianquestions:First,duetoavarietyofweldingdefects,suchtypesofsteelforthemaincrack;Second,changesinmaterialpropertieswhenweldingonthetypeofsteelismainlyembrittlementproblem.1.Crack(1)Thermalcrack:hotrolledcarboncontentgenerallylower,whilethehighermanganesecontent,
3、sotheyMn/Scomparison,andhasgoodresistancetothermalcrackingperformance.Normally,theweldhotcrackingdoesnotoccur,butwhenthematerialcomponentfailureorserioussegregationofcarbon,sulfurcontenthigher,Mn/Sratioislow,pronetohotcracking.Manganeseinthesteelwithmanganesesulfidesulfurtored
4、ucetheharmfuleffectsofsulfurandenhancetheperformanceofsteelthermalcracking.(2)Coldcrack:thecrackdependsonthecoldsteel,hardenedsteel,thetendencyofthetendencytowardhardeningjustdependsonitschemicalcomposition.Hotrolledsteelcontainsasmallamountofalloyingelementsbecauseofitslowcar
5、bonsteelwhenthecarbonequivalentisslightlyhigherthansome,sothislowcarbonsteelhardenedtendtobebiggerthanthat,butwiththeincreaseofsteelstrengthlevel,theincreaseinalloyingelements,itThehardeningtendencyincreasesshouldbebasedontheformandsteelfittingstoadjustthelinethicknessoftheene
6、rgy,preheatingandpost-heattemperature,tocontroltheheat-affectedzoneofthecoolingrate,whilereducingtheamountofweldmetalhydrogenandothermeasurestopreventcoldcracks.(3)Reheatcracking:Considerationsfromthechemicalcompositionofsteel,hotrolledsteeldoesnotcontainasstrongcarbideforming
7、elements,soagainnotsensitivetohotcracking,butalsobyincreasingthepreheatingtemperatureandpostweldheatsuchmeasuresimmediatelyaftertopreventhotcracking.2.Embrittled(1)Hotzoneembrittlement:hotrolledsteelweldingneartheweldzoneisheatedtoabove100℃coarsegrainzone,easytoproducegraingro
8、wthphenomenonisworstinweldedjointsofplasticparts,oftentowiths
