AWS Certified Welder Aluminum D1.2 Exam
Questions and Correct Answers (Verified Answers)
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1. What is the primary welding process used for aluminum GTAW?
A. SMAW
B. GMAW
C. FCAW
D. SAW
Answer: B
GMAW (MIG) and GTAW (TIG) are most commonly used for aluminum
due to shielding requirements and oxide layer control.
2. Why is AC current preferred in GTAW aluminum welding?
A. Deeper penetration only
B. Removes oxide layer and provides cleaning action
C. Increases filler deposition rate
D. Reduces shielding gas flow
,Answer: B
AC current provides cathodic cleaning that breaks up aluminum oxide.
3. What gas is most commonly used for aluminum GTAW?
A. CO₂
B. Argon
C. Oxygen
D. Nitrogen
Answer: B
Argon provides stable arc characteristics and good shielding for
aluminum.
4. What is the melting point of aluminum approximately?
A. 660°C
B. 1000°C
C. 1500°C
D. 2000°C
Answer: A
Aluminum melts at about 660°C, much lower than steel.
,5. What is the purpose of AC balance control in TIG welding
aluminum?
A. Controls wire feed speed
B. Adjusts cleaning vs penetration ratio
C. Increases voltage only
D. Controls shielding gas flow
Answer: B
AC balance controls oxide cleaning vs penetration.
6. What defect is most common when oxide is not removed properly?
A. Undercut
B. Porosity
C. Cracking
D. Slag inclusion
Answer: B
Aluminum oxide contamination causes gas entrapment leading to
porosity.
7. Which filler metal is commonly used for 6061 aluminum?
, A. ER70S-6
B. ER4043
C. E6010
D. E308L
Answer: B
ER4043 is commonly used due to silicon content improving fluidity and
crack resistance.
8. What is the main cause of hot cracking in aluminum welds?
A. Excess shielding gas
B. Improper filler selection
C. Low current
D. High travel speed only
Answer: B
Incorrect filler alloy selection can lead to solidification cracking.
9. What is the purpose of back purging in aluminum welding?
A. Increase deposition
B. Prevent oxidation on root side
C. Speed up cooling
Questions and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary welding process used for aluminum GTAW?
A. SMAW
B. GMAW
C. FCAW
D. SAW
Answer: B
GMAW (MIG) and GTAW (TIG) are most commonly used for aluminum
due to shielding requirements and oxide layer control.
2. Why is AC current preferred in GTAW aluminum welding?
A. Deeper penetration only
B. Removes oxide layer and provides cleaning action
C. Increases filler deposition rate
D. Reduces shielding gas flow
,Answer: B
AC current provides cathodic cleaning that breaks up aluminum oxide.
3. What gas is most commonly used for aluminum GTAW?
A. CO₂
B. Argon
C. Oxygen
D. Nitrogen
Answer: B
Argon provides stable arc characteristics and good shielding for
aluminum.
4. What is the melting point of aluminum approximately?
A. 660°C
B. 1000°C
C. 1500°C
D. 2000°C
Answer: A
Aluminum melts at about 660°C, much lower than steel.
,5. What is the purpose of AC balance control in TIG welding
aluminum?
A. Controls wire feed speed
B. Adjusts cleaning vs penetration ratio
C. Increases voltage only
D. Controls shielding gas flow
Answer: B
AC balance controls oxide cleaning vs penetration.
6. What defect is most common when oxide is not removed properly?
A. Undercut
B. Porosity
C. Cracking
D. Slag inclusion
Answer: B
Aluminum oxide contamination causes gas entrapment leading to
porosity.
7. Which filler metal is commonly used for 6061 aluminum?
, A. ER70S-6
B. ER4043
C. E6010
D. E308L
Answer: B
ER4043 is commonly used due to silicon content improving fluidity and
crack resistance.
8. What is the main cause of hot cracking in aluminum welds?
A. Excess shielding gas
B. Improper filler selection
C. Low current
D. High travel speed only
Answer: B
Incorrect filler alloy selection can lead to solidification cracking.
9. What is the purpose of back purging in aluminum welding?
A. Increase deposition
B. Prevent oxidation on root side
C. Speed up cooling
