MINDPLUG SOLUTIONS, EMPOWERING MINDS, BUILDING FUTURES
CWB WELDING INSPECTOR LEVEL III STUDY GUIDE
EXAM COMPLETE (2026) PREP WITH PRACTICE
QUESTIONS & VERIFIED ANSWERS
How does yield strength vary with grain size?
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
(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.
(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
EDUCATIONAL SUPPORT • ACADEMIC RESOURCES • PROFESSIONAL GUIDANCE
, MINDPLUG SOLUTIONS, EMPOWERING MINDS, BUILDING FUTURES
(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
(c)
What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
(c) argon
(d) oxygen
(a)
How can porosity due to nitrogen be controlled in welding nickel?
By using filler metal containing titanium.
What is the most likely cause of porosity in carbon steel welds?
(a) hydrogen from reduction of water
EDUCATIONAL SUPPORT • ACADEMIC RESOURCES • PROFESSIONAL GUIDANCE
CWB WELDING INSPECTOR LEVEL III STUDY GUIDE
EXAM COMPLETE (2026) PREP WITH PRACTICE
QUESTIONS & VERIFIED ANSWERS
How does yield strength vary with grain size?
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
(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.
(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
EDUCATIONAL SUPPORT • ACADEMIC RESOURCES • PROFESSIONAL GUIDANCE
, MINDPLUG SOLUTIONS, EMPOWERING MINDS, BUILDING FUTURES
(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
(c)
What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
(c) argon
(d) oxygen
(a)
How can porosity due to nitrogen be controlled in welding nickel?
By using filler metal containing titanium.
What is the most likely cause of porosity in carbon steel welds?
(a) hydrogen from reduction of water
EDUCATIONAL SUPPORT • ACADEMIC RESOURCES • PROFESSIONAL GUIDANCE
