Braincrafts
CWB WELDING INSPECTOR LEVEL 3
EXAM NEWEST 2024-2025 ACTUAL
EXAM COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - (answers)(c)
The Ellingham diagram
(a) is a plot of thermal conductivity against temperature,
(b) shows the free energy of oxide formation against temperature.
(c) shows the rate of oxidation of metals against temperature. - (answers)(b)
True or False?
A metal with a high negative free energy of oxide formation will generally require greater
shielding from the atmosphere during welding. - (answers)True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - (answers)(b)
Which of the following elements is often present in submerged arc fluxes to improve arc
stability?
(a) copper
, Braincrafts
(b) potassium
(c) nickel
(d) tungsten - (answers)(b)
Thoria is added to tunsten electrodes for what purpose? - (answers)To increase thermionic
emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - (answers)False. Metals generally have one of
three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? - (answers)FCC and HCP
The real strength of metals is lower than the theoretical value because:
(a) real crystals always fracture along specific crystal planes.
(b) grain boundary sliding occurs.
(c) the presence of dislocations facilitates slip. - (answers)(c)
Multiplication and subsequent congestion of moving dislocations causes:
(a) elastic extension.
(b) work or strain hardening.
(c) a drop in the yield stress. - (answers)(b)
Which of the following elements are most likely to form interstitial solid solutions?
(a) copper
(b) nickel
CWB WELDING INSPECTOR LEVEL 3
EXAM NEWEST 2024-2025 ACTUAL
EXAM COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - (answers)(c)
The Ellingham diagram
(a) is a plot of thermal conductivity against temperature,
(b) shows the free energy of oxide formation against temperature.
(c) shows the rate of oxidation of metals against temperature. - (answers)(b)
True or False?
A metal with a high negative free energy of oxide formation will generally require greater
shielding from the atmosphere during welding. - (answers)True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - (answers)(b)
Which of the following elements is often present in submerged arc fluxes to improve arc
stability?
(a) copper
, Braincrafts
(b) potassium
(c) nickel
(d) tungsten - (answers)(b)
Thoria is added to tunsten electrodes for what purpose? - (answers)To increase thermionic
emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - (answers)False. Metals generally have one of
three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? - (answers)FCC and HCP
The real strength of metals is lower than the theoretical value because:
(a) real crystals always fracture along specific crystal planes.
(b) grain boundary sliding occurs.
(c) the presence of dislocations facilitates slip. - (answers)(c)
Multiplication and subsequent congestion of moving dislocations causes:
(a) elastic extension.
(b) work or strain hardening.
(c) a drop in the yield stress. - (answers)(b)
Which of the following elements are most likely to form interstitial solid solutions?
(a) copper
(b) nickel
