AWS Certified Welder Aluminum D1.2
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
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1. Which alloy series is most commonly used for structural aluminum welding?
A. 1xxx
B. 2xxx
C. 5xxx
D. 7xxx
Answer: C
Rationale: 5xxx series alloys (Al-Mg) are widely used for structural
applications due to good weldability and corrosion resistance.
2. What is the primary shielding gas used in GTAW of aluminum?
A. CO₂
B. Argon
C. Oxygen
D. Nitrogen
Answer: B
Rationale: Argon provides stable arc characteristics and adequate
cleaning action for aluminum welding.
,3. What polarity is typically used for GTAW aluminum welding?
A. DCEN
B. DCEP
C. AC
D. Pulsed DC
Answer: C
Rationale: AC provides both penetration and oxide cleaning action
necessary for aluminum.
4. What is the main purpose of oxide removal before welding aluminum?
A. Improve color
B. Reduce cost
C. Prevent porosity and lack of fusion
D. Increase hardness
Answer: C
Rationale: Aluminum oxide melts at a higher temperature than base
metal and can cause defects if not removed.
5. Which process is most commonly used for aluminum welding in
production?
A. SMAW
B. FCAW
C. GMAW
D. SAW
Answer: C
Rationale: GMAW (MIG) is widely used due to speed and efficiency in
aluminum welding.
6. What defect is commonly caused by hydrogen in aluminum welds?
A. Cracking
B. Porosity
C. Undercut
D. Slag inclusion
Answer: B
, Rationale: Hydrogen dissolves in molten aluminum and forms gas pores
upon solidification.
7. Which filler metal is commonly used for welding 6061 aluminum?
A. ER4043
B. ER7018
C. ER308
D. ER1100
Answer: A
Rationale: ER4043 is commonly used due to its fluidity and crack
resistance.
8. What cleaning method is commonly used prior to welding aluminum?
A. Sandblasting only
B. Solvent cleaning and wire brushing
C. Water rinse only
D. Heating
Answer: B
Rationale: Removing oil and oxide is essential for weld quality.
9. What is the melting point of aluminum compared to steel?
A. Higher
B. Lower
C. Same
D. Double
Answer: B
Rationale: Aluminum melts at a much lower temperature (~660°C) than
steel.
10.Which electrode type is used in GTAW aluminum welding?
A. Pure tungsten
B. Thoriated tungsten
C. Zirconiated tungsten
D. Carbon electrode
Answer: C
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. Which alloy series is most commonly used for structural aluminum welding?
A. 1xxx
B. 2xxx
C. 5xxx
D. 7xxx
Answer: C
Rationale: 5xxx series alloys (Al-Mg) are widely used for structural
applications due to good weldability and corrosion resistance.
2. What is the primary shielding gas used in GTAW of aluminum?
A. CO₂
B. Argon
C. Oxygen
D. Nitrogen
Answer: B
Rationale: Argon provides stable arc characteristics and adequate
cleaning action for aluminum welding.
,3. What polarity is typically used for GTAW aluminum welding?
A. DCEN
B. DCEP
C. AC
D. Pulsed DC
Answer: C
Rationale: AC provides both penetration and oxide cleaning action
necessary for aluminum.
4. What is the main purpose of oxide removal before welding aluminum?
A. Improve color
B. Reduce cost
C. Prevent porosity and lack of fusion
D. Increase hardness
Answer: C
Rationale: Aluminum oxide melts at a higher temperature than base
metal and can cause defects if not removed.
5. Which process is most commonly used for aluminum welding in
production?
A. SMAW
B. FCAW
C. GMAW
D. SAW
Answer: C
Rationale: GMAW (MIG) is widely used due to speed and efficiency in
aluminum welding.
6. What defect is commonly caused by hydrogen in aluminum welds?
A. Cracking
B. Porosity
C. Undercut
D. Slag inclusion
Answer: B
, Rationale: Hydrogen dissolves in molten aluminum and forms gas pores
upon solidification.
7. Which filler metal is commonly used for welding 6061 aluminum?
A. ER4043
B. ER7018
C. ER308
D. ER1100
Answer: A
Rationale: ER4043 is commonly used due to its fluidity and crack
resistance.
8. What cleaning method is commonly used prior to welding aluminum?
A. Sandblasting only
B. Solvent cleaning and wire brushing
C. Water rinse only
D. Heating
Answer: B
Rationale: Removing oil and oxide is essential for weld quality.
9. What is the melting point of aluminum compared to steel?
A. Higher
B. Lower
C. Same
D. Double
Answer: B
Rationale: Aluminum melts at a much lower temperature (~660°C) than
steel.
10.Which electrode type is used in GTAW aluminum welding?
A. Pure tungsten
B. Thoriated tungsten
C. Zirconiated tungsten
D. Carbon electrode
Answer: C
