CWB Welding Inspector Level III Study Guide Exam 2026|2027
Questions with Verified Answers | latest update
What is thermal conductivity divided by specific heat and specific gravity known as? - Correct Answer -
Thermal diffusivity
True or False?
A metal with a low thermal conductivity is more likely to reach the maximum melting efficiency when
welded. - Correct Answer -True
Would a joint geometry designed for thick stainless steel be perfectly acceptable for welding thick
aluminum? - Correct Answer -No. Grooves for thick aluminum would have a wider angle than for stainless
steel.
When welding on a thick plate the cooling rate is proportional to the:
(a) heat input.
(b) inverse of the heat input.
(c) inverse of the square of the heat input. - Correct Answer -(b)
From Figure 11.10(Module 20-2014, page 54), estimate the cooling rate for a submerged arc bead on a 19
mm plate (no preheat) with an energy input of 1.77 kJ/in. - Correct Answer -16°C/s at 540°C
1|Page
, Which of the following metals is likely to need the greatest degree of shielding from the atmosphere
during welding?
(a) copper
(b) lead
(c) titanium
(d) steel
(e) gold - Correct Answer -(c)
In an electroslag flux the current is carried mainly by:
(a) neutral oxides.
(b) holes.
(c) mobile ions.
(d) thermionic electrons.
(e) free electrons. - Correct Answer -(c)
Compared with pure tungsten, a thoriated tungsten electrode is expected to:
(a) get hotter more quickly.
(b) absorb more electrons.
(c) have a shorten life.
(d) operate at a lower temperature for the same current.
2|Page
Questions with Verified Answers | latest update
What is thermal conductivity divided by specific heat and specific gravity known as? - Correct Answer -
Thermal diffusivity
True or False?
A metal with a low thermal conductivity is more likely to reach the maximum melting efficiency when
welded. - Correct Answer -True
Would a joint geometry designed for thick stainless steel be perfectly acceptable for welding thick
aluminum? - Correct Answer -No. Grooves for thick aluminum would have a wider angle than for stainless
steel.
When welding on a thick plate the cooling rate is proportional to the:
(a) heat input.
(b) inverse of the heat input.
(c) inverse of the square of the heat input. - Correct Answer -(b)
From Figure 11.10(Module 20-2014, page 54), estimate the cooling rate for a submerged arc bead on a 19
mm plate (no preheat) with an energy input of 1.77 kJ/in. - Correct Answer -16°C/s at 540°C
1|Page
, Which of the following metals is likely to need the greatest degree of shielding from the atmosphere
during welding?
(a) copper
(b) lead
(c) titanium
(d) steel
(e) gold - Correct Answer -(c)
In an electroslag flux the current is carried mainly by:
(a) neutral oxides.
(b) holes.
(c) mobile ions.
(d) thermionic electrons.
(e) free electrons. - Correct Answer -(c)
Compared with pure tungsten, a thoriated tungsten electrode is expected to:
(a) get hotter more quickly.
(b) absorb more electrons.
(c) have a shorten life.
(d) operate at a lower temperature for the same current.
2|Page
