CWB WELDING INSPECTOR LEVEL III
STUDY GUIDE QUESTIONS WITH 100%
CORRECT ANSWERS { GRADED A+}
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ✔✔(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. - ✔✔(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. - ✔✔True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - ✔✔(b)
Which of the following elements is often present in submerged arc fluxes to
improve arc stability?
(a) copper
(b) potassium
(c) nickel
(d) tungsten - ✔✔(b)
Thoria is added to tunsten electrodes for what purpose? - ✔✔To increase
thermionic emission by lowering the work function.
True or False?
STUDY GUIDE QUESTIONS WITH 100%
CORRECT ANSWERS { GRADED A+}
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ✔✔(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. - ✔✔(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. - ✔✔True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - ✔✔(b)
Which of the following elements is often present in submerged arc fluxes to
improve arc stability?
(a) copper
(b) potassium
(c) nickel
(d) tungsten - ✔✔(b)
Thoria is added to tunsten electrodes for what purpose? - ✔✔To increase
thermionic emission by lowering the work function.
True or False?
