CWB Welding Inspector Level III Study
Guide Latest Update Comprehensive
Questions with Correct Answers Graded
Excellent Score A+
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. - Answer -(d)
Can strain aging in low carbon steels take place at room temperature? - Answer -Yes
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. - Answer -(d)
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.
(e) emit more ions. - Answer -(d)
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
, (c) only ions. - 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. - Answer -16°C/s at 540°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. - Answer -(b)
How can porosity due to nitrogen be controlled in welding nickel? - Answer -By using filler metal
containing titanium.
How does yield strength vary with grain size? - Answer -Inversely as the square root of the grain
size.
How many phases are there in a eutectic- one or two? - Answer -Two
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 - Answer -(c)
If FCC iron has a denser structure than BCC iron, why does it have a higher solubility for carbon? -
Answer -The preferred site for carbon in BCC iron is smaller than that in FCC iron.
If two metals have complete mutual solid solubility how many phases are formed in the solid- one or
two? - Answer -One
In an electroslag flux the current is carried mainly by:
(a) neutral oxides.
(b) holes.
(c) mobile ions.
(d) thermionic electrons.
(e) free electrons. - Answer -(c)
Increasing the initial plate temperature (preheat):
(a) has no effect on the cooling rate.
(b) reduces the weld heat input.
Guide Latest Update Comprehensive
Questions with Correct Answers Graded
Excellent Score A+
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. - Answer -(d)
Can strain aging in low carbon steels take place at room temperature? - Answer -Yes
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. - Answer -(d)
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.
(e) emit more ions. - Answer -(d)
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
, (c) only ions. - 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. - Answer -16°C/s at 540°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. - Answer -(b)
How can porosity due to nitrogen be controlled in welding nickel? - Answer -By using filler metal
containing titanium.
How does yield strength vary with grain size? - Answer -Inversely as the square root of the grain
size.
How many phases are there in a eutectic- one or two? - Answer -Two
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 - Answer -(c)
If FCC iron has a denser structure than BCC iron, why does it have a higher solubility for carbon? -
Answer -The preferred site for carbon in BCC iron is smaller than that in FCC iron.
If two metals have complete mutual solid solubility how many phases are formed in the solid- one or
two? - Answer -One
In an electroslag flux the current is carried mainly by:
(a) neutral oxides.
(b) holes.
(c) mobile ions.
(d) thermionic electrons.
(e) free electrons. - Answer -(c)
Increasing the initial plate temperature (preheat):
(a) has no effect on the cooling rate.
(b) reduces the weld heat input.
