Welding Quiz 1Word文件下载.docx
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Welding Quiz 1Word文件下载.docx
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d.preheatingincreasesweldingoutput
5.Whatisthemostcommoncarbonsteelmaterialusedforboilersandpressurevessels?
a.Highcarbonsteel
b.Lowcarbonsteel
c.Mediumcarbonsteel
d.allofabove
6.Interpasstemperatureisthemaxtemperaturetobecontrolledwhilewelding.Statementis:
a.True
b.False
7.Postheatingofweldisapplied:
a.immediatelyafterwelding
b.beforewelding
c.duringwelding
d.noneoftheabove
8.HydrogencracksintheweldHAZislikelytooccurwhenwelding:
a.lowcarbonsteel
b.austeniticstainlesssteel
c.chrome-molysteel
d.weatheringsteel
9.Whatistheminimum%ofchromiumrequiredtomakethesteelstainless
a.1c.11
b.5d.9
10.Themainreasonforpreheatingofmediumcarbonsteelandchrome-molysteelbeforegascuttingisto:
a.improvequalityofcut
b.increasespeedofcutting
c.preventhardeningandcracking
d.refinegrainstructure
11.Charpytestisconductedtomeasure:
a.hardness
b.strength
c.toughness
d.fatigue
12.AddditionofCr,Mo,Vtosteelimproves
a.notchtoughness
b.creepproperties
c.corrosionresistance
13.Excessivepreheatandinterpasstemperatureduringweldingonhighstrengthlowalloysteelwillresultin:
a.cracks
b.porosity
c.reductioninmechanicalproperties
d.noaffect
14.RustisformedformIronandwhichotherelement?
a.Hydrogenb.sulphurc.Oxygend.nitrogen
15.Coldworkingofsteelwillresultin
a.improvedcorrosionresistance
b.increasedhardness
c.improvedductility
d.reductioninstrength
16.Whichmetalisusedforgalvanizing?
a.chrome
b.Lead
c.Tin
d.Zinc
17.whichoneofthestainlesssteeldoesnotnormallyrequirepreheatforwelding
a.austenitic
b.ferritic
c.matenistic
d.noneofabove
18.rapidcoolingofasteelfromausteniticrangeresultsinahardbrittlestructureknownas
a.pearlite
b.ferrite
c.martensite
d.bainite
19.Whichofthefollowingchangeswillrequireincreaseinpreheat?
a.decreasedcarbonequivalentc.increasedthickness
b.increasedcarbonequivalentd.b&
20.Whatheattreatmentischaracterizedbyholdingthepartataustenisingtempforsometimeandthenslowcoolinginthefurnace?
a.normalizing
b.quenching
c.annealing
d.stressrelieving
21.Whichofthefollowinggenerallyfollowsquenching?
a.annealing
b.tempering
c.normalizing
22.Heatinputcanbeincreasedby:
a.increasingcurrent
b.reducingcurrent
c.increasingspeed
d.reducingvoltage
23.calculatecarbonequivalentusingformulaCE=%C+%Mn/6+%(Cr+Mo+V)/5+%(Ni+Cu)/15
a.0.4b.0.6c.0.2d.0.8
24.IncreaseofheatinputforausteniticSSweldingwillresultin:
b.increaseincarbideprecipitation
c.decreaseincorrosionresistance
25.FerriteinausteniticSSweldcanbecalculatedusing:
a.WRC92diagram
b.Ferritoscope
c.chemicalanalysis
26.DuplexSSisbetterthanausteniticSSforchlorideenvironment.Statementis:
a.True
27.IncreaseinferritecontentofausteniticSSweldwillresultin:
a.loweringofcorrosionresistance
b.improvingcorrosionresistance
c.noeffect
d.poorweldability
28.Dilutioninoverlayweldingcanbereducedby;
a.increasingthespeed
b.increasingthecurrent
c.increasingthevoltage
d.decreasingthespeed
29.Whichisthebestarcweldingprocessforcladdingofsteel?
a.SMAW
b.GTAW
c.SAW-wire
d.SAW-Strips
30.overlappingofweldbeadsincreasesdilution:
Statementis
31.Ferrousmaterialspecificationsarelistedin:
a.ASMEsectionIX
b.ASMESectionIIA
c.ASMEsectionIIB
d.ASMEsectionV
32.Whichoftheelementisnotaferriteformer?
a.Carbon
b.Chromium
c.Molybdenum
d.Niobium
33.WhichSScategoryhasdualstructure?
a.austeniticc.duplex
b.ferriticd.martenstic
34.SensitisationofausteniticSSisenhancedby:
a.increasingcarboncontent
b.additionofstabilizingelementlikeTi,Cb
c.reducingtheheatinput
d.decreasingthecarboncontent
35.Whatistheexpansionforterm“PREN”?
a.PositiveRatioEqualNumbers
b.PositiveResistanceequalnumber
c.PittingresistanceEquivalentNumber
d.Pittingratioequivalentnumber
36.WhichofthefollowingelementdoesnothaveeffectonPREN?
a.Chromium
b.Molybdenum
c.Nitrogen
d.Nickel
37.HigherthePRENhigheristhepittingresistance.Statementis
a.False
b.True
38.Bondingstrengthofcladplateisevaluatedby:
a.Bendtestc.sheartest
b.tensiletestd.compressionte
39.Whichisanundesirableimpurityinsteel?
b.manganese
c.silicon
d.Sulphur
40.Steelwith3%carbonisknownas:
b.Castiron
c.Caststeel
d.mediumcarbonsteel
41.PWHTofequipmentaspercodeiscarriedoutby:
c.stressrelieving
d.annealing
42.Lowalloysteelhasalloyingelements:
a.>
25%
b.<
10%
c.>
10%
d.>
15%
43.Steelweldsshouldbeprotectedfrom:
a.Nitrogen,oxygen,hydrogen
b.Argon
c.Helium
d.b&
44.Stainlesssteelweldsrequirecoolingbetweenpassesbecause:
a.temperaturebuildcouldinducehotcracking
b.Coolingtheweldreducessolubilityofhydrogen
c.Coolingpromotesprecipitationofchromiumcarbides
d.weldmetalwillnotsolidifyproperly.
45.whichoneofthefollowingisaferrousmetal?
a.Aluminum
b.Copper.
C.lowalloysteel
46.Majordifferencebetweenquenchingandannealingprocessis:
a.temperaturetowhichalloyisheated
b.soakingtime
c.coolingrate
d.heatingmedium
47.Smallamountofferriteinausteniticweld:
a.increasesweldcracking
b.decreasesweldcracking
c.hasnoaffect
48.Whichofthefollowingcanbeaccomplishedusingeitherthermalormechanicaltechniques?
a.annealing
b.stressrelieving
c.normalizing
d.quenching
49.ThefourcategoriesofSSderivetheirrespectivenamesfrom:
a.themanwhodiscoveredthem
b.thecrystalstructureusuallyfoundinthematroomtemperature
c.theirappearance
d.theirmechanicalproperties
50.Theuseofpreheatwilltendto:
a.resultinawiderHAZ
b.producealowerhardnessinHAZ
c.slowdownthecoolingrate
d.alloftheabove
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