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CWB WELDING INSPECTOR LEVEL III STUDY GUIDE
2025| BRAND NEW ACTUAL EXAM WITH 100%
VERIFIED QUESTIONS AND CORRECT SOLUTIONS|
GUARANTEED VALUE PACK| ACE YOUR GRADES.
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - (answer)(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. - (answer)(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. - (answer)True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - (answer)(b)
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Which of the following elements is often present in submerged arc fluxes to
improve arc stability?
(a) copper
(b) potassium
(c) nickel
(d) tungsten - (answer)(b)
Thoria is added to tunsten electrodes for what purpose? - (answer)To increase
thermionic emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - (answer)False. Metals generally
have one of three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? -
(answer)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. - (answer)(c)
Multiplication and subsequent congestion of moving dislocations causes:
CWB WELDING INSPECTOR LEVEL III STUDY GUIDE
2025| BRAND NEW ACTUAL EXAM WITH 100%
VERIFIED QUESTIONS AND CORRECT SOLUTIONS|
GUARANTEED VALUE PACK| ACE YOUR GRADES.
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - (answer)(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. - (answer)(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. - (answer)True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - (answer)(b)
, 2|Page
Which of the following elements is often present in submerged arc fluxes to
improve arc stability?
(a) copper
(b) potassium
(c) nickel
(d) tungsten - (answer)(b)
Thoria is added to tunsten electrodes for what purpose? - (answer)To increase
thermionic emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - (answer)False. Metals generally
have one of three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? -
(answer)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. - (answer)(c)
Multiplication and subsequent congestion of moving dislocations causes:
