CWB WELDING INSPECTOR LEVEL 3 EXAM
2026 LATEST UPDATE QUESTIONS AND
CORRECT VERIFIED ANSWRS ALREADY
GRADED A+
The presence of close-packed planes in FCC metals gives many of them the special
property of:
(a) good high-temperature strength.
(b) the ability to undergo extensive plastic deformation.
(c) brittleness at low temperatures.
(d) complete solubility with all other metals.
(e) small grains. - ans-(b)
Work hardening occurs because of:
(a) fine precipitates.
(b) a reduction in the number of dislocations making slip more difficult.
(c) locking of dislocations by carbon and nitrogen atoms.
(d) multiplication and congestion of dislocations. - ans-(e)
Nickel and copper have complete solid solubility. Copper has a lower melting point then
nickel. If a 50/50 Cu-Ni alloy is cooled from the liquid what will be the composition of the
first solid to form?
(a) 50% Cu
(b) less than 50% Cu
(c) Pure Cu
(d) Pure Ni
(e) more than 50% Cu - ans-(b)
A Wide solidification range and rapid growth rate during solidification will encourage:
(a) planar growth.
(b) equilibrium conditions.
(c) no constitutional supercooling.
(d) dendritic growth.
(e) eutectic formation. - ans-(d)
Centerline hot cracking im more likely with:
(a) shallow, round welds.
(b) short weld pools.
(c) wide groove angles.
(d) deep, narrow welds.
(e) vertical welds. - ans-(d)
Porosity in welds due to a specific gas is more likely if the:
, (a) solubility of the gas at the freezing point is much lower than at higher temperatures.
(b) solubility of the gas at the freezing point is very high.
(c) gas does not dissolve in the liquid.
(d) solubility is independent of temperature.
(e) gas has a high solubility in the solid. - ans-(a)
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ans-(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. - ans-(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. - ans-True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - ans-(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 - ans-(b)
Thoria is added to tunsten electrodes for what purpose? - ans-To increase thermionic
emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - ans-False. Metals generally have
one of three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? - ans-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. - ans-(c)
2026 LATEST UPDATE QUESTIONS AND
CORRECT VERIFIED ANSWRS ALREADY
GRADED A+
The presence of close-packed planes in FCC metals gives many of them the special
property of:
(a) good high-temperature strength.
(b) the ability to undergo extensive plastic deformation.
(c) brittleness at low temperatures.
(d) complete solubility with all other metals.
(e) small grains. - ans-(b)
Work hardening occurs because of:
(a) fine precipitates.
(b) a reduction in the number of dislocations making slip more difficult.
(c) locking of dislocations by carbon and nitrogen atoms.
(d) multiplication and congestion of dislocations. - ans-(e)
Nickel and copper have complete solid solubility. Copper has a lower melting point then
nickel. If a 50/50 Cu-Ni alloy is cooled from the liquid what will be the composition of the
first solid to form?
(a) 50% Cu
(b) less than 50% Cu
(c) Pure Cu
(d) Pure Ni
(e) more than 50% Cu - ans-(b)
A Wide solidification range and rapid growth rate during solidification will encourage:
(a) planar growth.
(b) equilibrium conditions.
(c) no constitutional supercooling.
(d) dendritic growth.
(e) eutectic formation. - ans-(d)
Centerline hot cracking im more likely with:
(a) shallow, round welds.
(b) short weld pools.
(c) wide groove angles.
(d) deep, narrow welds.
(e) vertical welds. - ans-(d)
Porosity in welds due to a specific gas is more likely if the:
, (a) solubility of the gas at the freezing point is much lower than at higher temperatures.
(b) solubility of the gas at the freezing point is very high.
(c) gas does not dissolve in the liquid.
(d) solubility is independent of temperature.
(e) gas has a high solubility in the solid. - ans-(a)
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ans-(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. - ans-(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. - ans-True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - ans-(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 - ans-(b)
Thoria is added to tunsten electrodes for what purpose? - ans-To increase thermionic
emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - ans-False. Metals generally have
one of three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? - ans-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. - ans-(c)
