AWS Certified Welder Aluminum D1.2
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary AWS specification associated with structural welding of
aluminum?
A. AWS D1.1
B. AWS D1.2
C. AWS D1.5
D. AWS D9.1
Answer: AWS D1.2
Rationale: AWS D1.2 is the AWS Structural Welding Code—Aluminum and
establishes requirements for welded aluminum structures.
2. Which property of aluminum makes heat control particularly important
during welding?
A. Extremely high melting point
B. Low thermal conductivity
C. High thermal conductivity
D. High carbon content
Answer: High thermal conductivity
Rationale: Aluminum conducts heat rapidly away from the weld area, making
heat input and travel speed important for achieving proper fusion.
, 3. What oxide forms naturally on the surface of aluminum?
A. Iron oxide
B. Aluminum oxide
C. Zinc oxide
D. Silicon oxide
Answer: Aluminum oxide
Rationale: Aluminum rapidly forms a tenacious aluminum-oxide layer that must
be properly removed or controlled for quality welding.
4. Approximately how high is the melting temperature of aluminum oxide
compared with pure aluminum?
A. Much lower
B. Approximately the same
C. Much higher
D. It does not melt
Answer: Much higher
Rationale: Aluminum melts at a relatively low temperature, while its oxide layer
melts at a much higher temperature, which can interfere with fusion.
5. Which welding process is commonly used for high-quality aluminum
structural welding?
A. GTAW
B. Oxyfuel welding only
C. Thermite welding
D. Forge welding
Answer: GTAW
Rationale: Gas tungsten arc welding provides excellent control and is widely
used for aluminum where weld quality and appearance are important.
, 6. Which shielding gas is commonly used for GTAW of aluminum?
A. Oxygen
B. Carbon dioxide
C. Argon
D. Chlorine
Answer: Argon
Rationale: Argon provides effective arc shielding and good arc starting and
stability for aluminum GTAW.
7. Which gas may be blended with argon to increase heat input and
penetration in some aluminum GTAW applications?
A. Helium
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer: Helium
Rationale: Helium has a higher ionization potential and can produce a hotter
arc, increasing heat transfer to the workpiece.
8. What is the purpose of shielding gas during arc welding?
A. To increase base-metal hardness
B. To prevent atmospheric contamination of the molten weld pool
C. To cool the electrode
D. To remove all porosity after welding
Answer: To prevent atmospheric contamination of the molten weld pool
Rationale: Shielding gas protects the molten metal from oxygen, nitrogen,
moisture, and other atmospheric contaminants.
9. Which electrode type is commonly used for AC GTAW of aluminum?
, A. Pure tungsten only
B. Zirconiated or similar AC-suitable tungsten
C. Carbon electrode
D. Mild-steel electrode
Answer: Zirconiated or similar AC-suitable tungsten
Rationale: Tungsten types suitable for AC aluminum welding provide good arc
stability and resistance to contamination.
10.What is the main purpose of AC in GTAW of aluminum?
A. To eliminate shielding gas
B. To provide oxide-cleaning action while welding
C. To eliminate heat input
D. To prevent arc formation
Answer: To provide oxide-cleaning action while welding
Rationale: AC alternates polarity, allowing the electrode-positive portion of the
cycle to help disrupt the aluminum oxide layer.
11.What is a major disadvantage of excessive electrode-positive time in AC
GTAW?
A. Excessive electrode heating
B. No arc formation
C. Elimination of cleaning action
D. Complete loss of shielding gas
Answer: Excessive electrode heating
Rationale: Electrode-positive operation places substantial heat on the tungsten,
potentially causing overheating and instability.
12.What should be used to clean aluminum before welding?
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary AWS specification associated with structural welding of
aluminum?
A. AWS D1.1
B. AWS D1.2
C. AWS D1.5
D. AWS D9.1
Answer: AWS D1.2
Rationale: AWS D1.2 is the AWS Structural Welding Code—Aluminum and
establishes requirements for welded aluminum structures.
2. Which property of aluminum makes heat control particularly important
during welding?
A. Extremely high melting point
B. Low thermal conductivity
C. High thermal conductivity
D. High carbon content
Answer: High thermal conductivity
Rationale: Aluminum conducts heat rapidly away from the weld area, making
heat input and travel speed important for achieving proper fusion.
, 3. What oxide forms naturally on the surface of aluminum?
A. Iron oxide
B. Aluminum oxide
C. Zinc oxide
D. Silicon oxide
Answer: Aluminum oxide
Rationale: Aluminum rapidly forms a tenacious aluminum-oxide layer that must
be properly removed or controlled for quality welding.
4. Approximately how high is the melting temperature of aluminum oxide
compared with pure aluminum?
A. Much lower
B. Approximately the same
C. Much higher
D. It does not melt
Answer: Much higher
Rationale: Aluminum melts at a relatively low temperature, while its oxide layer
melts at a much higher temperature, which can interfere with fusion.
5. Which welding process is commonly used for high-quality aluminum
structural welding?
A. GTAW
B. Oxyfuel welding only
C. Thermite welding
D. Forge welding
Answer: GTAW
Rationale: Gas tungsten arc welding provides excellent control and is widely
used for aluminum where weld quality and appearance are important.
, 6. Which shielding gas is commonly used for GTAW of aluminum?
A. Oxygen
B. Carbon dioxide
C. Argon
D. Chlorine
Answer: Argon
Rationale: Argon provides effective arc shielding and good arc starting and
stability for aluminum GTAW.
7. Which gas may be blended with argon to increase heat input and
penetration in some aluminum GTAW applications?
A. Helium
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer: Helium
Rationale: Helium has a higher ionization potential and can produce a hotter
arc, increasing heat transfer to the workpiece.
8. What is the purpose of shielding gas during arc welding?
A. To increase base-metal hardness
B. To prevent atmospheric contamination of the molten weld pool
C. To cool the electrode
D. To remove all porosity after welding
Answer: To prevent atmospheric contamination of the molten weld pool
Rationale: Shielding gas protects the molten metal from oxygen, nitrogen,
moisture, and other atmospheric contaminants.
9. Which electrode type is commonly used for AC GTAW of aluminum?
, A. Pure tungsten only
B. Zirconiated or similar AC-suitable tungsten
C. Carbon electrode
D. Mild-steel electrode
Answer: Zirconiated or similar AC-suitable tungsten
Rationale: Tungsten types suitable for AC aluminum welding provide good arc
stability and resistance to contamination.
10.What is the main purpose of AC in GTAW of aluminum?
A. To eliminate shielding gas
B. To provide oxide-cleaning action while welding
C. To eliminate heat input
D. To prevent arc formation
Answer: To provide oxide-cleaning action while welding
Rationale: AC alternates polarity, allowing the electrode-positive portion of the
cycle to help disrupt the aluminum oxide layer.
11.What is a major disadvantage of excessive electrode-positive time in AC
GTAW?
A. Excessive electrode heating
B. No arc formation
C. Elimination of cleaning action
D. Complete loss of shielding gas
Answer: Excessive electrode heating
Rationale: Electrode-positive operation places substantial heat on the tungsten,
potentially causing overheating and instability.
12.What should be used to clean aluminum before welding?
