CWB WELDING INSPECTOR LEVEL 3 EXAM 2026 UPDATE
QUESTIOSNS AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+ (BRAND NEW VISION)
How does yield strength vary with grain size? - ANS-Inversely as the square root of the grain
size.
Which of the following factors increases the degree of constitutional supercooling?
(a) very slow solidification rate
(b) an alloy with a very narrow solidification range
(c) an alloy with a wide solidification range - ANS-(c)
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. - ANS-(b)
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 - ANS-(b)
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 - ANS-(c)
What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
(c) argon
(d) oxygen - ANS-(a)
How can porosity due to nitrogen be controlled in welding nickel? - ANS-By using filler metal
containing titanium.
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 - ANS-(c)
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 - ANS-(a)
What is thermal conductivity divided by specific heat and specific gravity known as? - ANS-
Thermal diffusivity
QUESTIOSNS AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+ (BRAND NEW VISION)
How does yield strength vary with grain size? - ANS-Inversely as the square root of the grain
size.
Which of the following factors increases the degree of constitutional supercooling?
(a) very slow solidification rate
(b) an alloy with a very narrow solidification range
(c) an alloy with a wide solidification range - ANS-(c)
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. - ANS-(b)
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 - ANS-(b)
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 - ANS-(c)
What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
(c) argon
(d) oxygen - ANS-(a)
How can porosity due to nitrogen be controlled in welding nickel? - ANS-By using filler metal
containing titanium.
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 - ANS-(c)
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 - ANS-(a)
What is thermal conductivity divided by specific heat and specific gravity known as? - ANS-
Thermal diffusivity
