外文翻译---低合金结构钢的焊接性分析.docx

外文翻译---低合金结构钢的焊接性分析.docx

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外文资料翻译

WELDABILITYANALYSISOFQ345STEEL

LOWSTEELALLOYSTRUCTUREOFWELDABILITY

ANALYSIS

16Mnand15MnVbelongtothelow-alloysteelhotrolledsteel,thesesteelpriceslower,andhassatisfiedthemechanicalpropertiesandprocessingperformance,firstofalltoanalyzethistypeofsteelwelding,weldingontwo

pointsoftypicallyBianxianquestions:

First,duetoavarietyofweldingdefects,suchtypesofsteelforthemaincrack;Second,changesinmaterialpropertieswhenweldingonthetypeofsteelismainlyembrittlementproblem.

1.Crack

（1）Thermalcrack:

hotrolledcarboncontentgenerallylower,whilethehighermanganesecontent,sotheyMn/Scomparison,andhasgoodresistance

tothermalcrackingperformance.Normally,theweldhotcrackingdoesnotoccur,butwhenthematerialcomponentfailureorserioussegregationofcarbon,sulfurcontenthigher,Mn/Sratioislow,pronetohotcracking.Manganeseinthesteelwithmanganesesulfidesulfurtoreducetheharmfuleffectsofsulfurandenhancetheperformanceofsteelthermalcracking.

（2）Coldcrack:

thecrackdependsonthecoldsteel,hardenedsteel,thetendencyofthetendencytowardhardeningjustdependsonitschemicalcomposition.Hotrolledsteelcontainsasmallamountofalloyingelementsbecauseofitslowcarbonsteelwhenthecarbonequivalentisslightlyhigherthansome,sothislowcarbonsteelhardenedtendtobebiggerthanthat,but

withtheincreaseofsteelstrengthlevel,theincreaseinalloyingelements,itThehardening tendencyincreases shouldbebasedontheformandsteelfittingstoadjustthelinethicknessoftheenergy,preheating andpost-heat

temperature,tocontroltheheat-affectedzoneofthecoolingrate,whilereducingtheamountofweldmetalhydrogenandothermeasurestopreventcoldcracks.

（3）Reheat cracking:

Considerations fromthechemicalcomposition ofsteel,hotrolledsteeldoesnotcontainasstrongcarbideformingelements,so

againnotsensitive tohotcracking, butalsobyincreasing thepreheatingtemperatureandpostweldheatsuchmeasuresimmediatelyaftertopreventhotcracking.

2.Embrittled

（1）Hotzoneembrittlement:

hotrolledsteelweldingneartheweldzoneisheatedtoabove100℃coarsegrainzone,easytoproduce graingrowthphenomenonisworstinweldedjointsofplasticparts,oftentowithstandthe

stresstheroleofthedamage.Topreventtheoverheatingzoneembrittlementmeasuresistoimprovethecoolingrate,inparticular,toimprovethestability

ofaustenitewithintheminimumcoolingrate,shortentheresidencetimeinthistemperaturerange,reduceorpreventtheemergenceofaustenitetoraisesteelimpacttoughness,butalsotopreventtheoverheatingzonecoarse-grainedbrittle,shouldnotbeusingtoomuchenergyinput.

（2）Heatshouldbecrisp:

theheatshouldbecrispisthethermalstressduringtheweldingprocessbecausetheplasticdeformation todislocationmultiplication,whilenitrogenandcarbonatomsinducedrapidproliferationofdislocationaccumulationarea,thereshouldbecrispofheat.16Mnand15MnV

thesetwotypesofsteelhasgottobebrittletendencyofheat,eliminatingweldingheatshouldbecrispandeffectivemeasuresofpost-weldannealing.

LOWALLOYSTRUCTURALSTEELWELDING

1.Weldingpreparation:

（1）Thedesignofgroovetypeofweldingshouldbeavoidednotthrough

or partial penetration of the groove, but also to minimize the weldcross-sectional areatoreducetheresidualstressinjoints,itcanalsoreduce

theconsumptionofweldingmaterials.

（2）Groovetonotewhenusingthermalcuttingedgeofthebasemetalwillpreventtheformationofacertaindepthofthehardenedlayer,thishardenedlayeroflowductilityoftencoldcrackingsource.

（3）Weldareabeforeweldingsteeltoeliminatesurfacemoisture,groovesurfaceoxide,rust,greaseandothercontaminants.

（4）Before use welding materials manufacturer recommendedspecificationsshouldbedry.

（5）Orientationandassembly,andtheformalweldseammustbethesametypeofelectrode.

2.Weldingheatinputofchoice:

Lineenergyparametersisweldingcurrent,arcvoltageandweldingspeed.

Low-alloystructuralsteelwelding,heatinputparameterstotheneedtoensure

thatjointpenetration andweld,butalsoconsidertheirjointperformance.Weldingoflowcarboncontentandcarboncontentofhot-rolled steellowersideofthe16Mnsteel,theweldingheatinputisnotstrictlylimited,butimprovetheplasticityandtoughnessofhotzoneorconsidertheuseofsmaller

lineenergyismorefavorable;whenweldingwith16Mnhighcarbonsteel,in

ordertoreducethehardeningtendency,toprevent