CWB WELDING INSPECTOR LEVEL III ACTUAL
EXAM PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
● 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)
, ● 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)
EXAM PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
● 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)
, ● 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)
