CWB Welding Inspector Level III Study
Guide
A wide range of solidification and a rapid rate of growth during solidification will foster: (a)
growth that is planar. (b) the conditions of equilibrium. c) Constitutional supercooling is
absent. (d) dendritic expansion. (e) formation by eutectics - ANS(d) Can low carbon steels
undergo strain aging at room temperature? - Yes Centerline hot cracking is more likely to
happen to me with: (a) round, shallow welds (b) short pool welds. (c) wide angles in the
grooves. (d) narrow, deep welds (e) vertical welds. - ANS(d)
Compared with pure tungsten, a thoriated tungsten electrode is expected to:
(a) get hotter and faster. (b) hold on to more electrons. c) live for a shorter time. (d) run at a
lower temperature and draw the same amount of current. (e) produce additional ions. -
ANS(d) Conducting electricity involves: (a) atoms and electrons.
b) ions and electrons (c) only ions, based on ANS(b) Estimate the cooling rate for a
submerged arc bead on a 19 mm plate with an energy input of 1.77 kJ/in using Figure 11.10
(Module 20-2014, page 54). - ANS16°C/s at 540°C When welding, hot cracking is more likely
in: (a) metals that are pure (b) alloys with a wide solidification range.
(c) alloys that contain a lot of alloy. - ANS(b) ANSBy using titanium-containing filler metal,
nickel porosity caused by nitrogen can be controlled in welding. ANSInversely, as the square
root of the grain size, how does yield strength change with grain size. Is there one or two
phases in a eutectic? - ANSWER: If centerline solidification cracking is occuring in welding a
structural steel what is a likely cause?
a too-long electrical extension (b) an excessive arc voltage (c) excessive speed and welding
current (d) a weld that is too big - ANS(c) - ANSThe preferred site for carbon in BCC iron is
smaller than that in FCC iron, so why does FCC iron have a higher solubility for carbon if its
structure is denser than that of BCC iron? One or two phases are formed in the solid if two
metals have complete mutual solid solubility. In an electroslag flux the current is carried
mainly by:
(a) neutral oxides.
(b) the gaps. (c) ions that move. d) electrons that are thermionic. ANS(c) (e) free electrons
Increasing the initial plate temperature (preheat):
(a) has no effect on the rate of cooling. (b) reduces weld heat input. (c) slows down the
cooling process. (d) results in wider isotherms. (e) increases the efficiency of the arc. -
ANS(c) Moving dislocations become congested as a result of their multiplicity, which results
in: a flexible extension (b) hardening from exertion or strain. ANS(b): (c) a decrease in the
yield stress. Nickel and copper have complete solid solubility. Nickel has a higher melting
point than copper does. What will the composition of the first solid be when a 50/50 Cu-Ni
alloy is cooled from a liquid? (a) 50% Cu
(b) less than 50 percent Cu (c) Complete Cu (d) Pure Ni
e) more than fifty percent Cu - ANS(b) Welds with a particular gas are more likely to have
porosity if: (a) the gas's solubility is much lower at the freezing point than it is at higher
temperatures. (b) the gas has a very high solubility at the freezing point. c) the gas cannot
Guide
A wide range of solidification and a rapid rate of growth during solidification will foster: (a)
growth that is planar. (b) the conditions of equilibrium. c) Constitutional supercooling is
absent. (d) dendritic expansion. (e) formation by eutectics - ANS(d) Can low carbon steels
undergo strain aging at room temperature? - Yes Centerline hot cracking is more likely to
happen to me with: (a) round, shallow welds (b) short pool welds. (c) wide angles in the
grooves. (d) narrow, deep welds (e) vertical welds. - ANS(d)
Compared with pure tungsten, a thoriated tungsten electrode is expected to:
(a) get hotter and faster. (b) hold on to more electrons. c) live for a shorter time. (d) run at a
lower temperature and draw the same amount of current. (e) produce additional ions. -
ANS(d) Conducting electricity involves: (a) atoms and electrons.
b) ions and electrons (c) only ions, based on ANS(b) Estimate the cooling rate for a
submerged arc bead on a 19 mm plate with an energy input of 1.77 kJ/in using Figure 11.10
(Module 20-2014, page 54). - ANS16°C/s at 540°C When welding, hot cracking is more likely
in: (a) metals that are pure (b) alloys with a wide solidification range.
(c) alloys that contain a lot of alloy. - ANS(b) ANSBy using titanium-containing filler metal,
nickel porosity caused by nitrogen can be controlled in welding. ANSInversely, as the square
root of the grain size, how does yield strength change with grain size. Is there one or two
phases in a eutectic? - ANSWER: If centerline solidification cracking is occuring in welding a
structural steel what is a likely cause?
a too-long electrical extension (b) an excessive arc voltage (c) excessive speed and welding
current (d) a weld that is too big - ANS(c) - ANSThe preferred site for carbon in BCC iron is
smaller than that in FCC iron, so why does FCC iron have a higher solubility for carbon if its
structure is denser than that of BCC iron? One or two phases are formed in the solid if two
metals have complete mutual solid solubility. In an electroslag flux the current is carried
mainly by:
(a) neutral oxides.
(b) the gaps. (c) ions that move. d) electrons that are thermionic. ANS(c) (e) free electrons
Increasing the initial plate temperature (preheat):
(a) has no effect on the rate of cooling. (b) reduces weld heat input. (c) slows down the
cooling process. (d) results in wider isotherms. (e) increases the efficiency of the arc. -
ANS(c) Moving dislocations become congested as a result of their multiplicity, which results
in: a flexible extension (b) hardening from exertion or strain. ANS(b): (c) a decrease in the
yield stress. Nickel and copper have complete solid solubility. Nickel has a higher melting
point than copper does. What will the composition of the first solid be when a 50/50 Cu-Ni
alloy is cooled from a liquid? (a) 50% Cu
(b) less than 50 percent Cu (c) Complete Cu (d) Pure Ni
e) more than fifty percent Cu - ANS(b) Welds with a particular gas are more likely to have
porosity if: (a) the gas's solubility is much lower at the freezing point than it is at higher
temperatures. (b) the gas has a very high solubility at the freezing point. c) the gas cannot
