Welding Quiz 1.docx

Welding Quiz 1.docx

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WeldingQuiz1

WeldingQuiz1（Materials）

1.Steelisanalloyof

a.ChromiumandIron

b.SulphurandPhosphorus

c.IronandCarbon

d.ManganeseandNickel

2.HighCarbonsteelwillhaveCarbon%

a.lessthan0.1

b.between0.3to0.5

c.0.25max

d.greaterthan0.5

3.Increaseincarbon%will:

a.increasehardnessandstrength

b.improveductilityandtoughness

c.reduceweldability

d.a&c

4.Whichoneofthefollowingstatementiscorrect?

a.preheatingincreaseshardness

b.preheatingincreasesshrinkagestress

c.preheatingincreasescoolingtime

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

d.allofabove

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&c

20.Whatheattreatmentischaracterizedbyholdingthepartataustenisingtempforsometimeandthenslowcoolinginthefurnace?

a.normalizing

b.quenching

c.annealing

d.stressrelieving

21.Whichofthefollowinggenerallyfollowsquenching?

a.annealing

b.tempering

c.normalizing

d.stressrelieving

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:

a.improvedcorrosionresistance

b.increaseincarbideprecipitation

c.decreaseincorrosionresistance

d.a&c

25.FerriteinausteniticSSweldcanbecalculatedusing:

a.WRC92diagram

b.Ferritoscope

c.chemicalanalysis

d.allofabove

26.DuplexSSisbetterthanausteniticSSforchlorideenvironment.Statementis:

a.True

b.False

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

a.True

b.False

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?

a.Carbon

b.manganese

c.silicon

d.Sulphur

40.Steelwith3%carbonisknownas:

a.Highcarbonsteel

b.Castiron

c.Caststeel

d.mediumcarbonsteel

41.PWHTofequipmentaspercodeiscarriedoutby:

a.normalizing

b.tempering

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&c

44.Stainlesssteelweldsrequirecoolingbetweenpassesbecause:

a.temperaturebuildcouldinducehotcracking

b.Coolingtheweldreducessolubilityofhydrogen

c.Coolingpromotesprecipitationofchromiumcarbides

d.weldmetalwillnotsolidifyproperly.

45.whichoneofthefollowingisaferrousmetal?

a.Aluminum

b.Copper.

C.lowalloysteel

d.Nickel

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