CWB Welding Inspector Level 3 EXAM
STUDY GUIDE 2026/2027 ACCURATE
QUESTIONS WITH CORRECT
DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. 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)
2. 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
3. Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - ANSWER ✔ (b)
4. Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ANSWER ✔ (c)
5. 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)
6. Thoria is added to tunsten electrodes for what purpose? - ANSWER ✔ To
increase thermionic emission by lowering the work function.
7. True or False?
All pure metals have the same crystal structure. - ANSWER ✔ False. Metals
generally have one of three basic structures.
8. Which crystal structure(s) is (are) composed of close-packed planes? -
ANSWER ✔ FCC and HCP
9. 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)
10.Hot Cracking during welding is more likely in:
(a) pure metals.
(b) alloys with a wide solidification range.
(c) alloys with a very high alloy content. - ANSWER ✔ (b)
11.Which of the following alloys would you expect to give the highest risk of
hot cracking?
(a) Al-0.1%Cu
(b) Al-3%Cu
(c) Al-8%Cu - ANSWER ✔ (b)
12.If centerline solidification cracking is occuring in welding a structural steel
what is a likely cause?
(a) electrical extension too long
(b) arc voltage too high
(c) welding current and speed too high
(d) weld too large - ANSWER ✔ (c)
13.What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
, (c) argon
(d) oxygen - ANSWER ✔ (a)
14.How can porosity due to nitrogen be controlled in welding nickel? -
ANSWER ✔ By using filler metal containing titanium.
15.What is the most likely cause of porosity in carbon steel welds?
(a) hydrogen from reduction of water
(b) nitrogen
(c) carbon monoxide from reaction of oxygen with carbon
(d) oxygen direct from the air - ANSWER ✔ (c)
16.What elements are included in electrodes or fluxes to control porosity in
steel welds?
(a) silicon, aluminum, manganese
(b) copper, nickel, molybdenum
(c) sulphur, phosphorus, selenium
(d) silica, alumina, magnesia - ANSWER ✔ (a)
17.Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ANSWER ✔ (c)
18.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)
19.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
20.Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
STUDY GUIDE 2026/2027 ACCURATE
QUESTIONS WITH CORRECT
DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. 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)
2. 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
3. Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - ANSWER ✔ (b)
4. Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ANSWER ✔ (c)
5. 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)
6. Thoria is added to tunsten electrodes for what purpose? - ANSWER ✔ To
increase thermionic emission by lowering the work function.
7. True or False?
All pure metals have the same crystal structure. - ANSWER ✔ False. Metals
generally have one of three basic structures.
8. Which crystal structure(s) is (are) composed of close-packed planes? -
ANSWER ✔ FCC and HCP
9. 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)
10.Hot Cracking during welding is more likely in:
(a) pure metals.
(b) alloys with a wide solidification range.
(c) alloys with a very high alloy content. - ANSWER ✔ (b)
11.Which of the following alloys would you expect to give the highest risk of
hot cracking?
(a) Al-0.1%Cu
(b) Al-3%Cu
(c) Al-8%Cu - ANSWER ✔ (b)
12.If centerline solidification cracking is occuring in welding a structural steel
what is a likely cause?
(a) electrical extension too long
(b) arc voltage too high
(c) welding current and speed too high
(d) weld too large - ANSWER ✔ (c)
13.What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
, (c) argon
(d) oxygen - ANSWER ✔ (a)
14.How can porosity due to nitrogen be controlled in welding nickel? -
ANSWER ✔ By using filler metal containing titanium.
15.What is the most likely cause of porosity in carbon steel welds?
(a) hydrogen from reduction of water
(b) nitrogen
(c) carbon monoxide from reaction of oxygen with carbon
(d) oxygen direct from the air - ANSWER ✔ (c)
16.What elements are included in electrodes or fluxes to control porosity in
steel welds?
(a) silicon, aluminum, manganese
(b) copper, nickel, molybdenum
(c) sulphur, phosphorus, selenium
(d) silica, alumina, magnesia - ANSWER ✔ (a)
17.Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ANSWER ✔ (c)
18.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)
19.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
20.Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
