CWB LEVEL 2 EXAM PRACTICE QUESTIONS
AND ANSWERS | COMPLETE STUDY SET |
WELDING BUREAU CERTIFICATION |
UPDATED 2026
CWB LEVEL 2 EXAM PRACTICE QUESTIONS AND ANSWERS | COMPLETE STUDY
SET | WELDING BUREAU CERTIFICATION | UPDATED 2026
• 200 carefully crafted practice questions covering all CWB Level 2
examination topics — use this set to test yourself, identify weak areas, and
reinforce key concepts before your certification exam.
• Each question includes five options (A–E), a highlighted correct answer with
EXPERT RATIONALE — work through sections systematically and revisit any
question you get wrong until you can confidently explain why the correct
answer is right.
SECTION 1: WELDING PROCESSES & FUNDAMENTALS
1. Which welding process uses a non-consumable tungsten electrode and an
external shielding gas to protect the weld pool?
A) Shielded Metal Arc Welding (SMAW)
B) Flux-Cored Arc Welding (FCAW)
C) Submerged Arc Welding (SAW)
D) Gas Metal Arc Welding (GMAW)
E) Gas Tungsten Arc Welding (GTAW)
EXPERT RATIONALE: GTAW (TIG welding) uses a non-consumable tungsten electrode.
The weld pool and electrode are protected by an inert shielding gas such as argon or
helium. Filler metal, when required, is added separately.
,2. In SMAW, the primary function of the electrode coating (flux) is to:
A) Increase the deposition rate of the weld metal
B) Reduce the cost of the welding consumable
C) Increase the hardness of the weld bead
D) Provide additional carbon to the weld pool
E) Shield the weld pool from atmospheric contamination and stabilize the
arc
EXPERT RATIONALE: The flux coating on SMAW electrodes burns to produce a shielding
gas and forms slag over the weld pool, protecting it from oxygen and nitrogen in the
atmosphere. It also helps stabilize the arc during welding.
3. Which transfer mode in GMAW is characterized by large droplets
transferring across the arc, typically used at low current and voltage?
A) Spray transfer
B) Pulsed spray transfer
C) Rotational transfer
D) Short-circuit transfer
E) Globular transfer
EXPERT RATIONALE: In short-circuit transfer, the wire makes contact with the weld pool
repeatedly, causing the circuit to short. Globular transfer involves large droplets that fall
by gravity. The question describes globular transfer characteristics but short-circuit
transfer is the low-current, low-voltage mode used on thin materials. Note: Globular
transfer features large irregular droplets at intermediate settings.
4. What is the primary shielding gas used in GTAW when welding aluminum?
A) Carbon dioxide (CO₂)
,B) A mixture of argon and CO₂
C) Helium and CO₂ mixture
D) Pure oxygen
E) Pure argon or argon/helium mixture
EXPERT RATIONALE: Argon is the most commonly used shielding gas for GTAW on
aluminum because it provides excellent arc stability and cleaning action. Helium can be
added to increase heat input. CO₂ and oxygen are not suitable for GTAW as they would
contaminate the tungsten electrode.
5. Submerged Arc Welding (SAW) differs from other arc welding processes
because:
A) It requires no filler material
B) It uses a non-consumable electrode
C) It operates only in the vertical position
D) It requires no electrical power source
E) The arc is submerged beneath a layer of granular flux
EXPERT RATIONALE: In SAW, the arc between the consumable electrode and the
workpiece is completely submerged under a blanket of granular flux. This flux shields the
arc and weld pool, resulting in high-quality welds with minimal spatter and fume.
6. Which welding process is most suitable for welding thin sheet metal (below
3mm) with minimal distortion?
A) Submerged Arc Welding (SAW)
B) Shielded Metal Arc Welding (SMAW)
C) Flux-Cored Arc Welding (FCAW)
D) Gas Tungsten Arc Welding (GTAW)
, E) Electroslag Welding (ESW)
EXPERT RATIONALE: GTAW provides precise heat control and produces a clean, narrow
weld bead, making it ideal for thin materials where distortion must be minimized. SAW
and ESW are designed for thick sections, while SMAW is generally used for medium to
heavy sections.
7. The term "duty cycle" in welding refers to:
A) The number of passes required to complete a weld
B) The time required to change an electrode
C) The frequency of weld inspections
D) The maximum amperage the machine can produce
E) The percentage of a 10-minute period a machine can weld at a given
output without overheating
EXPERT RATIONALE: Duty cycle is expressed as a percentage and indicates how long a
welding machine can operate continuously at a rated output within a 10-minute cycle. A
60% duty cycle means the machine can weld for 6 minutes and must rest for 4 minutes
to avoid overheating.
8. In FCAW, the "self-shielded" variant differs from "gas-shielded" FCAW in
that:
A) It cannot be used outdoors
B) It requires an external wire feeder
C) It produces higher quality welds in all applications
D) It requires a separate gas cylinder
E) It generates its own shielding from flux compounds within the wire
core, requiring no external gas
AND ANSWERS | COMPLETE STUDY SET |
WELDING BUREAU CERTIFICATION |
UPDATED 2026
CWB LEVEL 2 EXAM PRACTICE QUESTIONS AND ANSWERS | COMPLETE STUDY
SET | WELDING BUREAU CERTIFICATION | UPDATED 2026
• 200 carefully crafted practice questions covering all CWB Level 2
examination topics — use this set to test yourself, identify weak areas, and
reinforce key concepts before your certification exam.
• Each question includes five options (A–E), a highlighted correct answer with
EXPERT RATIONALE — work through sections systematically and revisit any
question you get wrong until you can confidently explain why the correct
answer is right.
SECTION 1: WELDING PROCESSES & FUNDAMENTALS
1. Which welding process uses a non-consumable tungsten electrode and an
external shielding gas to protect the weld pool?
A) Shielded Metal Arc Welding (SMAW)
B) Flux-Cored Arc Welding (FCAW)
C) Submerged Arc Welding (SAW)
D) Gas Metal Arc Welding (GMAW)
E) Gas Tungsten Arc Welding (GTAW)
EXPERT RATIONALE: GTAW (TIG welding) uses a non-consumable tungsten electrode.
The weld pool and electrode are protected by an inert shielding gas such as argon or
helium. Filler metal, when required, is added separately.
,2. In SMAW, the primary function of the electrode coating (flux) is to:
A) Increase the deposition rate of the weld metal
B) Reduce the cost of the welding consumable
C) Increase the hardness of the weld bead
D) Provide additional carbon to the weld pool
E) Shield the weld pool from atmospheric contamination and stabilize the
arc
EXPERT RATIONALE: The flux coating on SMAW electrodes burns to produce a shielding
gas and forms slag over the weld pool, protecting it from oxygen and nitrogen in the
atmosphere. It also helps stabilize the arc during welding.
3. Which transfer mode in GMAW is characterized by large droplets
transferring across the arc, typically used at low current and voltage?
A) Spray transfer
B) Pulsed spray transfer
C) Rotational transfer
D) Short-circuit transfer
E) Globular transfer
EXPERT RATIONALE: In short-circuit transfer, the wire makes contact with the weld pool
repeatedly, causing the circuit to short. Globular transfer involves large droplets that fall
by gravity. The question describes globular transfer characteristics but short-circuit
transfer is the low-current, low-voltage mode used on thin materials. Note: Globular
transfer features large irregular droplets at intermediate settings.
4. What is the primary shielding gas used in GTAW when welding aluminum?
A) Carbon dioxide (CO₂)
,B) A mixture of argon and CO₂
C) Helium and CO₂ mixture
D) Pure oxygen
E) Pure argon or argon/helium mixture
EXPERT RATIONALE: Argon is the most commonly used shielding gas for GTAW on
aluminum because it provides excellent arc stability and cleaning action. Helium can be
added to increase heat input. CO₂ and oxygen are not suitable for GTAW as they would
contaminate the tungsten electrode.
5. Submerged Arc Welding (SAW) differs from other arc welding processes
because:
A) It requires no filler material
B) It uses a non-consumable electrode
C) It operates only in the vertical position
D) It requires no electrical power source
E) The arc is submerged beneath a layer of granular flux
EXPERT RATIONALE: In SAW, the arc between the consumable electrode and the
workpiece is completely submerged under a blanket of granular flux. This flux shields the
arc and weld pool, resulting in high-quality welds with minimal spatter and fume.
6. Which welding process is most suitable for welding thin sheet metal (below
3mm) with minimal distortion?
A) Submerged Arc Welding (SAW)
B) Shielded Metal Arc Welding (SMAW)
C) Flux-Cored Arc Welding (FCAW)
D) Gas Tungsten Arc Welding (GTAW)
, E) Electroslag Welding (ESW)
EXPERT RATIONALE: GTAW provides precise heat control and produces a clean, narrow
weld bead, making it ideal for thin materials where distortion must be minimized. SAW
and ESW are designed for thick sections, while SMAW is generally used for medium to
heavy sections.
7. The term "duty cycle" in welding refers to:
A) The number of passes required to complete a weld
B) The time required to change an electrode
C) The frequency of weld inspections
D) The maximum amperage the machine can produce
E) The percentage of a 10-minute period a machine can weld at a given
output without overheating
EXPERT RATIONALE: Duty cycle is expressed as a percentage and indicates how long a
welding machine can operate continuously at a rated output within a 10-minute cycle. A
60% duty cycle means the machine can weld for 6 minutes and must rest for 4 minutes
to avoid overheating.
8. In FCAW, the "self-shielded" variant differs from "gas-shielded" FCAW in
that:
A) It cannot be used outdoors
B) It requires an external wire feeder
C) It produces higher quality welds in all applications
D) It requires a separate gas cylinder
E) It generates its own shielding from flux compounds within the wire
core, requiring no external gas
