Certificate Of Qualification Welder (456A)
Practice Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. What is the primary purpose of a welding procedure specification
(WPS)?
A. To record completed welds
B. To certify the welder
C. To provide approved welding parameters and methods
D. To inspect finished welds
Italicized rationale: A WPS ensures consistent weld quality by
defining variables such as current, voltage, filler metal, and
position.
2. Which welding process uses a continuously fed consumable wire
electrode?
A. SMAW
B. GTAW
C. GMAW
D. FCAW-S
Italicized rationale: GMAW uses a continuously fed solid wire
electrode through a welding gun.
3. What shielding gas is commonly used for carbon steel in GMAW?
A. Helium
B. Argon only
, C. Carbon dioxide or argon/CO₂ mix
D. Oxygen
Italicized rationale: CO₂ or mixed gases provide good penetration
and arc stability for carbon steel.
4. The main function of flux in SMAW electrodes is to:
A. Increase voltage
B. Protect the molten weld pool from contamination
C. Cool the weld faster
D. Increase electrode strength
Italicized rationale: Flux produces shielding gas and slag to protect
the weld from oxygen and nitrogen.
5. What does the “E” in an E7018 electrode designation represent?
A. Efficiency
B. Electrode coating
C. Electrode
D. Electric current
Italicized rationale: The letter “E” identifies the rod as an
electrode.
6. What does the “70” in E7018 indicate?
A. 70 amps required
B. 70 mm diameter
C. 70,000 psi tensile strength
D. 70% efficiency
Italicized rationale: Electrode strength is measured in thousands of
pounds per square inch.
7. Which welding position is considered the most difficult?
A. Flat
, B. Horizontal
C. Vertical
D. Overhead
Italicized rationale: Overhead welding requires control of molten
metal against gravity.
8. Lack of fusion is caused mainly by:
A. Excessive heat input
B. Insufficient heat or improper technique
C. Slow travel speed
D. Wide electrode angle
Italicized rationale: Low heat or poor manipulation prevents
proper bonding.
9. Porosity in a weld is usually caused by:
A. Excessive penetration
B. Contamination or poor shielding
C. Fast cooling
D. Thick base metal
Italicized rationale: Moisture, oil, rust, or gas loss causes trapped
gas bubbles.
10. What tool is used to remove slag after SMAW welding?
A. Wire brush only
B. Grinder
C. Chipping hammer
D. File
Italicized rationale: Slag must be chipped first before brushing.
11. What is the correct electrode storage method for low-
hydrogen rods?
Practice Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a welding procedure specification
(WPS)?
A. To record completed welds
B. To certify the welder
C. To provide approved welding parameters and methods
D. To inspect finished welds
Italicized rationale: A WPS ensures consistent weld quality by
defining variables such as current, voltage, filler metal, and
position.
2. Which welding process uses a continuously fed consumable wire
electrode?
A. SMAW
B. GTAW
C. GMAW
D. FCAW-S
Italicized rationale: GMAW uses a continuously fed solid wire
electrode through a welding gun.
3. What shielding gas is commonly used for carbon steel in GMAW?
A. Helium
B. Argon only
, C. Carbon dioxide or argon/CO₂ mix
D. Oxygen
Italicized rationale: CO₂ or mixed gases provide good penetration
and arc stability for carbon steel.
4. The main function of flux in SMAW electrodes is to:
A. Increase voltage
B. Protect the molten weld pool from contamination
C. Cool the weld faster
D. Increase electrode strength
Italicized rationale: Flux produces shielding gas and slag to protect
the weld from oxygen and nitrogen.
5. What does the “E” in an E7018 electrode designation represent?
A. Efficiency
B. Electrode coating
C. Electrode
D. Electric current
Italicized rationale: The letter “E” identifies the rod as an
electrode.
6. What does the “70” in E7018 indicate?
A. 70 amps required
B. 70 mm diameter
C. 70,000 psi tensile strength
D. 70% efficiency
Italicized rationale: Electrode strength is measured in thousands of
pounds per square inch.
7. Which welding position is considered the most difficult?
A. Flat
, B. Horizontal
C. Vertical
D. Overhead
Italicized rationale: Overhead welding requires control of molten
metal against gravity.
8. Lack of fusion is caused mainly by:
A. Excessive heat input
B. Insufficient heat or improper technique
C. Slow travel speed
D. Wide electrode angle
Italicized rationale: Low heat or poor manipulation prevents
proper bonding.
9. Porosity in a weld is usually caused by:
A. Excessive penetration
B. Contamination or poor shielding
C. Fast cooling
D. Thick base metal
Italicized rationale: Moisture, oil, rust, or gas loss causes trapped
gas bubbles.
10. What tool is used to remove slag after SMAW welding?
A. Wire brush only
B. Grinder
C. Chipping hammer
D. File
Italicized rationale: Slag must be chipped first before brushing.
11. What is the correct electrode storage method for low-
hydrogen rods?
