CWB WELDING INSPECTOR LEVEL III
STUDY GUIDE (2026/2027)
UPDATE|EXAM
QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED
ANSWERS (NEW)!!!
Whichmofmthemfollowingmmetalsmhasmthemhighestmthermalmconductivity?
(a)mcarbonmsteel
(b)mstainlessmsteel
(c)maluminumm-mCORRECTmANSWERm(c)
ThemEllinghammdiagram
(a)mismamplotmofmthermalmconductivitymagainstmtemperature,
(b)mshowsmthemfreemenergymofmoxidemformationmagainstmtemperature.
(c)mshowsmthemratemofmoxidationmofmmetalsmagainstmtemperature.m-mCORRECTmANSWERm(b)
TruemormFalse?
Ammetalmwithmamhighmnegativemfreemenergymofmoxidemformationmwillmgenerallymrequiremgreatermshi
eldingmfrommthematmospheremduringmwelding.m-mCORRECTmANSWERmTrue
Electricitymcanmbemconductedmby:
(a)matomsmandmelectrons.
(b)melectronsmandmions.
(c)monlymions.m-mCORRECTmANSWERm(b)
, Whichmofmthemfollowingmelementsmismoftenmpresentminmsubmergedmarcmfluxesmtomimprovemarcmsta
bility?
(a)mcopper
(b)mpotassium
(c)mnickel
(d)mtungstenm-mCORRECTmANSWERm(b)
Thoriamismaddedmtomtunstenmelectrodesmformwhatmpurpose?m-
mCORRECTmANSWERmTomincreasemthermionicmemissionmbymloweringmthemworkmfunction.
TruemormFalse?
Allmpuremmetalsmhavemthemsamemcrystalmstructure.m-
mCORRECTmANSWERmFalse.mMetalsmgenerallymhavemonemofmthreembasicmstructures.
Whichmcrystalmstructure(s)mism(are)mcomposedmofmclose-packedmplanes?m-
mCORRECTmANSWERmFCCmandmHCP
Themrealmstrengthmofmmetalsmismlowermthanmthemtheoreticalmvaluembecause:
(a)mrealmcrystalsmalwaysmfracturemalongmspecificmcrystalmplanes.
(b)mgrainmboundarymslidingmoccurs.
(c)mthempresencemofmdislocationsmfacilitatesmslip.m-mCORRECTmANSWERm(c)
Multiplicationmandmsubsequentmcongestionmofmmovingmdislocationsmcauses:
(a)melasticmextension.
(b)mworkmormstrainmhardening.
(c)mamdropminmthemyieldmstress.m-mCORRECTmANSWERm(b)
STUDY GUIDE (2026/2027)
UPDATE|EXAM
QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED
ANSWERS (NEW)!!!
Whichmofmthemfollowingmmetalsmhasmthemhighestmthermalmconductivity?
(a)mcarbonmsteel
(b)mstainlessmsteel
(c)maluminumm-mCORRECTmANSWERm(c)
ThemEllinghammdiagram
(a)mismamplotmofmthermalmconductivitymagainstmtemperature,
(b)mshowsmthemfreemenergymofmoxidemformationmagainstmtemperature.
(c)mshowsmthemratemofmoxidationmofmmetalsmagainstmtemperature.m-mCORRECTmANSWERm(b)
TruemormFalse?
Ammetalmwithmamhighmnegativemfreemenergymofmoxidemformationmwillmgenerallymrequiremgreatermshi
eldingmfrommthematmospheremduringmwelding.m-mCORRECTmANSWERmTrue
Electricitymcanmbemconductedmby:
(a)matomsmandmelectrons.
(b)melectronsmandmions.
(c)monlymions.m-mCORRECTmANSWERm(b)
, Whichmofmthemfollowingmelementsmismoftenmpresentminmsubmergedmarcmfluxesmtomimprovemarcmsta
bility?
(a)mcopper
(b)mpotassium
(c)mnickel
(d)mtungstenm-mCORRECTmANSWERm(b)
Thoriamismaddedmtomtunstenmelectrodesmformwhatmpurpose?m-
mCORRECTmANSWERmTomincreasemthermionicmemissionmbymloweringmthemworkmfunction.
TruemormFalse?
Allmpuremmetalsmhavemthemsamemcrystalmstructure.m-
mCORRECTmANSWERmFalse.mMetalsmgenerallymhavemonemofmthreembasicmstructures.
Whichmcrystalmstructure(s)mism(are)mcomposedmofmclose-packedmplanes?m-
mCORRECTmANSWERmFCCmandmHCP
Themrealmstrengthmofmmetalsmismlowermthanmthemtheoreticalmvaluembecause:
(a)mrealmcrystalsmalwaysmfracturemalongmspecificmcrystalmplanes.
(b)mgrainmboundarymslidingmoccurs.
(c)mthempresencemofmdislocationsmfacilitatesmslip.m-mCORRECTmANSWERm(c)
Multiplicationmandmsubsequentmcongestionmofmmovingmdislocationsmcauses:
(a)melasticmextension.
(b)mworkmormstrainmhardening.
(c)mamdropminmthemyieldmstress.m-mCORRECTmANSWERm(b)