AWS Certified Welder Aluminum D1.2
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary welding process used in the AWS D1.2 code
for aluminum?
a) Shielded Metal Arc Welding (SMAW)
b) Gas Tungsten Arc Welding (GTAW)
c) Flux-Cored Arc Welding (FCAW)
d) Submerged Arc Welding (SAW)
GTAW is preferred for aluminum due to better control of heat input
and weld quality.
2. Which of the following is the most common filler metal for 5xxx
series aluminum in D1.2 welding?
a) 4043
b) 5356
c) 5556
d) 6061
5556 filler is often used with 5xxx series alloys for good corrosion
resistance and mechanical properties.
3. Aluminum welds are prone to which of the following defects if the
base metal is not properly cleaned?
a) Underfill
, b) Porosity
c) Hydrogen-induced porosity
d) Lack of fusion
Aluminum easily absorbs hydrogen, causing porosity if surfaces
are not cleaned of oxides and contaminants.
4. Preheating aluminum prior to welding is usually:
a) Required to 300°C
b) Not generally required
c) Always required for 1/4” material
d) Required for GTAW only
Aluminum has high thermal conductivity; preheating is only
needed for thick sections.
5. Which joint design is most commonly recommended in D1.2 for
single-V groove welds?
a) Square groove
b) Double bevel groove
c) Single V-groove with backing strip
d) U-groove
A backing strip helps prevent burn-through and supports proper
penetration in single-V aluminum joints.
6. What is the maximum allowable distortion for aluminum welded
assemblies according to D1.2?
a) 1/8 inch per foot
b) 1/4 inch per foot
c) 3/16 inch per foot
d) 1/2 inch per foot
, The D1.2 code sets tight limits due to aluminum’s high thermal
expansion and distortion tendency.
7. Which cleaning method is recommended before welding
aluminum?
a) Solvent wipe
b) Grinding with steel wire brush
c) Stainless steel brush and acetone
d) Sandpaper only
Stainless steel brushes and acetone remove oxides and
contaminants without introducing iron.
8. What is the preferred shielding gas for GTAW of aluminum?
a) Carbon dioxide
b) Argon-Helium mix
c) 100% Argon
d) Oxygen mix
Argon provides stable arc and prevents oxidation during aluminum
GTAW.
9. Aluminum exhibits which characteristic that makes weld
penetration control more difficult?
a) Low thermal conductivity
b) High thermal conductivity
c) Low coefficient of expansion
d) High melting point
High thermal conductivity causes aluminum to dissipate heat
quickly, requiring precise control.
10. Which of the following alloys is considered a heat-treatable
aluminum alloy in the D1.2 code?
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary welding process used in the AWS D1.2 code
for aluminum?
a) Shielded Metal Arc Welding (SMAW)
b) Gas Tungsten Arc Welding (GTAW)
c) Flux-Cored Arc Welding (FCAW)
d) Submerged Arc Welding (SAW)
GTAW is preferred for aluminum due to better control of heat input
and weld quality.
2. Which of the following is the most common filler metal for 5xxx
series aluminum in D1.2 welding?
a) 4043
b) 5356
c) 5556
d) 6061
5556 filler is often used with 5xxx series alloys for good corrosion
resistance and mechanical properties.
3. Aluminum welds are prone to which of the following defects if the
base metal is not properly cleaned?
a) Underfill
, b) Porosity
c) Hydrogen-induced porosity
d) Lack of fusion
Aluminum easily absorbs hydrogen, causing porosity if surfaces
are not cleaned of oxides and contaminants.
4. Preheating aluminum prior to welding is usually:
a) Required to 300°C
b) Not generally required
c) Always required for 1/4” material
d) Required for GTAW only
Aluminum has high thermal conductivity; preheating is only
needed for thick sections.
5. Which joint design is most commonly recommended in D1.2 for
single-V groove welds?
a) Square groove
b) Double bevel groove
c) Single V-groove with backing strip
d) U-groove
A backing strip helps prevent burn-through and supports proper
penetration in single-V aluminum joints.
6. What is the maximum allowable distortion for aluminum welded
assemblies according to D1.2?
a) 1/8 inch per foot
b) 1/4 inch per foot
c) 3/16 inch per foot
d) 1/2 inch per foot
, The D1.2 code sets tight limits due to aluminum’s high thermal
expansion and distortion tendency.
7. Which cleaning method is recommended before welding
aluminum?
a) Solvent wipe
b) Grinding with steel wire brush
c) Stainless steel brush and acetone
d) Sandpaper only
Stainless steel brushes and acetone remove oxides and
contaminants without introducing iron.
8. What is the preferred shielding gas for GTAW of aluminum?
a) Carbon dioxide
b) Argon-Helium mix
c) 100% Argon
d) Oxygen mix
Argon provides stable arc and prevents oxidation during aluminum
GTAW.
9. Aluminum exhibits which characteristic that makes weld
penetration control more difficult?
a) Low thermal conductivity
b) High thermal conductivity
c) Low coefficient of expansion
d) High melting point
High thermal conductivity causes aluminum to dissipate heat
quickly, requiring precise control.
10. Which of the following alloys is considered a heat-treatable
aluminum alloy in the D1.2 code?
