CWB Welding Inspector Level 3 Exam |
Questions and Verified Answers| All
Modules Covered| 100% Correct| Grade
A | 2026/2027 Guide
Acicular ferrite in weld metal is
(a) proeutectoid ferrite formed at the grain boundaries.
(b) a type of martensite.
(c) ferrite nucleated within the austenite grains
- Correct Answer - (c) ferrite nucleated within the austenite grains.
Wires for CO2 welding usually contain silicon to
(a) increase the strength of the weld.
(b) allow easy feeding of the wire.
(c) deoxidize the weld pool.
- Correct Answer - (c) deoxidize the weld pool.
Which wire has the greatest deoxidizing power?
(a) B-G49A3CG2
(b) B-G 49A 2 C G3
(c) B-G49A3CG6 - Correct Answer - (a) B-G49A3CG2
,If you wished to obtain a deposit with very low silicon using SAW you
would use the combination of a:
(a) low silicon wire with an acidic (non-basic) flux.
(b) high silicon wire with a basic flux.
(c) low silicon wire with a basic flux. - Correct Answer - (c) low silicon
wire with a basic flux.
When might it be appropriate to specify basic fluxes for SAW? - Correct
Answer - When excellent toughness at low temp is required
Which welding parameter has the largest effect on the transfer of
elements from an active flux? - Correct Answer - Voltage
Will the use of argon shielding with flux cored arc welding always ensure
a low oxygen deposit? Explain. - Correct Answer - No, it depends on the
flux basicity
The region of a weld where the lowest Charpy impact values are usually
recorded is:
(a) close to the weld interface.
(b) the root region.
(c) the surface. - Correct Answer - (b) the root region.
,A weld metal had a strength of 500 MPa after a post-weld stress relief of
two hours. If the time were extended to four hours is it likely that the weld
metal would still exceed a specified minimum strength of 480 MPa? -
Correct Answer - Yes
Does a post-weld stress relief always improve the toughness of a weld
metal? Yes or No - Correct Answer - No
Steels form the largest group of commercially important alloys because
of the:
(a) great abundance of iron in the earth's crust.
(b) relative ease of extraction and low cost.
(c) wide range of properties that can be achieved as a result of the solid
state phase transformations.
(d) All of the above. - Correct Answer - (d) All of the above
Under equilibrium conditions, for a plain carbon steel the average
composition of pearlite is:
(a) 0.02% carbon.
(b) 0.2% carbon.
(c) 0.8% carbon.
(d) 1.2%carbon. - Correct Answer - (c) 0.8% carbon.
, Martensite is a phase produced in hardenable steels that are quenched
rapidly because the:
(a) reduced diffusion causes the carbon atoms to distort the usual BCC
crystal into a BCT
crystal by a shear mechanism.
(b) high thermal gradient produces high strains.
(c) steel is restricted from expanding by the cool outer surface during
quenching.
(d) carbon atoms accumulate on the austenite grain boundaries. -
Correct Answer - (a) reduced diffusion causes the carbon atoms to
distort the usual BCC crystal into a BCT
crystal by a shear mechanism.
Hardenability of steel is affected by:
(a) carbon content and austenite grain size.
(b) carbon content and small mass.
(c) alloy content and austenite grain size.
(d) the mass of the part and the cooling rate. - Correct Answer - (c) alloy
content and austenite grain size.
Secondary hardening is caused by:
(a) the formation of cementite during stress relief heat treatment. C
Questions and Verified Answers| All
Modules Covered| 100% Correct| Grade
A | 2026/2027 Guide
Acicular ferrite in weld metal is
(a) proeutectoid ferrite formed at the grain boundaries.
(b) a type of martensite.
(c) ferrite nucleated within the austenite grains
- Correct Answer - (c) ferrite nucleated within the austenite grains.
Wires for CO2 welding usually contain silicon to
(a) increase the strength of the weld.
(b) allow easy feeding of the wire.
(c) deoxidize the weld pool.
- Correct Answer - (c) deoxidize the weld pool.
Which wire has the greatest deoxidizing power?
(a) B-G49A3CG2
(b) B-G 49A 2 C G3
(c) B-G49A3CG6 - Correct Answer - (a) B-G49A3CG2
,If you wished to obtain a deposit with very low silicon using SAW you
would use the combination of a:
(a) low silicon wire with an acidic (non-basic) flux.
(b) high silicon wire with a basic flux.
(c) low silicon wire with a basic flux. - Correct Answer - (c) low silicon
wire with a basic flux.
When might it be appropriate to specify basic fluxes for SAW? - Correct
Answer - When excellent toughness at low temp is required
Which welding parameter has the largest effect on the transfer of
elements from an active flux? - Correct Answer - Voltage
Will the use of argon shielding with flux cored arc welding always ensure
a low oxygen deposit? Explain. - Correct Answer - No, it depends on the
flux basicity
The region of a weld where the lowest Charpy impact values are usually
recorded is:
(a) close to the weld interface.
(b) the root region.
(c) the surface. - Correct Answer - (b) the root region.
,A weld metal had a strength of 500 MPa after a post-weld stress relief of
two hours. If the time were extended to four hours is it likely that the weld
metal would still exceed a specified minimum strength of 480 MPa? -
Correct Answer - Yes
Does a post-weld stress relief always improve the toughness of a weld
metal? Yes or No - Correct Answer - No
Steels form the largest group of commercially important alloys because
of the:
(a) great abundance of iron in the earth's crust.
(b) relative ease of extraction and low cost.
(c) wide range of properties that can be achieved as a result of the solid
state phase transformations.
(d) All of the above. - Correct Answer - (d) All of the above
Under equilibrium conditions, for a plain carbon steel the average
composition of pearlite is:
(a) 0.02% carbon.
(b) 0.2% carbon.
(c) 0.8% carbon.
(d) 1.2%carbon. - Correct Answer - (c) 0.8% carbon.
, Martensite is a phase produced in hardenable steels that are quenched
rapidly because the:
(a) reduced diffusion causes the carbon atoms to distort the usual BCC
crystal into a BCT
crystal by a shear mechanism.
(b) high thermal gradient produces high strains.
(c) steel is restricted from expanding by the cool outer surface during
quenching.
(d) carbon atoms accumulate on the austenite grain boundaries. -
Correct Answer - (a) reduced diffusion causes the carbon atoms to
distort the usual BCC crystal into a BCT
crystal by a shear mechanism.
Hardenability of steel is affected by:
(a) carbon content and austenite grain size.
(b) carbon content and small mass.
(c) alloy content and austenite grain size.
(d) the mass of the part and the cooling rate. - Correct Answer - (c) alloy
content and austenite grain size.
Secondary hardening is caused by:
(a) the formation of cementite during stress relief heat treatment. C
