CWB WELDING INSPECTOR LEVEL III (ACTUAL 2025)
STUDY GUIDE
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. - <<Answers>>>(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 - <<Answers>>>(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 - <<Answers>>>(c)
What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
(c) argon
, CWB WELDING INSPECTOR LEVEL III (ACTUAL 2025)
STUDY GUIDE
(d) oxygen - <<Answers>>>(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. - <<Answers>>>(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. -
<<Answers>>>(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
STUDY GUIDE
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. - <<Answers>>>(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 - <<Answers>>>(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 - <<Answers>>>(c)
What is the most likely cause of porosity in aluminum welds?
(a) hydrogen
(b) nitrogen
(c) argon
, CWB WELDING INSPECTOR LEVEL III (ACTUAL 2025)
STUDY GUIDE
(d) oxygen - <<Answers>>>(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. - <<Answers>>>(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. -
<<Answers>>>(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
