,AWS D1.2 Aluminum Welder Exam | Certification
Q&A (2026)
1. Which of the following best describes the primary scope of AWS D1.2?
A) Welding requirements for aluminum pressure vessels and piping
B) Welding requirements for any type of structure made from aluminum structural alloys,
except pressure vessels and piping
C) Welding requirements for all aluminum products including castings and forgings
D) Welding requirements for aluminum sheet metal only
Correct Answer: Welding requirements for any type of structure made from aluminum
structural alloys, except pressure vessels and piping
Rationale: AWS D1.2 explicitly covers welding requirements for any type of structure made
from aluminum structural alloys. The code specifically excludes aluminum pressure vessels
and pressure piping from its scope. This distinction is critical because other codes govern
pressure-containing applications.
2. What is the primary alloying element in 5XXX series aluminum alloys?
A) Silicon
B) Zinc
C) Magnesium
D) Copper
Correct Answer: Magnesium
Rationale: Magnesium is the principal alloying element in the 5XXX series aluminum alloys.
These Al-Mg alloys provide good corrosion resistance and moderate strength. Unlike the
6XXX series which contains magnesium and silicon, the 5XXX series relies primarily on
magnesium for its properties.
,3. Why is AC current preferred for GTAW welding of aluminum?
A) It produces deeper penetration than DC
B) It provides cathodic cleaning that breaks up the aluminum oxide layer
C) It increases the filler metal deposition rate
D) It reduces the amount of shielding gas required
Correct Answer: It provides cathodic cleaning that breaks up the aluminum oxide layer
Rationale: AC current alternates between electrode positive (cleaning action) and electrode
negative (penetration). The cathodic cleaning half-cycle breaks up the tenacious aluminum
oxide layer that melts at approximately 2050°F—much higher than the base metal. This
cleaning action is essential for proper fusion and weld quality.
4. What is the maximum preheat and interpass temperature allowed for heat-treatable
aluminum alloys under AWS D1.2?
A) 150°F (65°C)
B) 200°F (93°C)
C) 250°F (120°C)
D) 350°F (177°C)
Correct Answer: 250°F (120°C)
Rationale: AWS D1.2 caps preheat and interpass temperature at 250°F (120°C) for heat-
treatable alloys and 5000-series Al-Mg alloys above 3% Mg. Excessive heat can damage
aluminum tempers and alloy families. This limit prevents strength loss and hot cracking in
these sensitive materials.
5. A welder successfully completes a test weldment that meets the WPS qualification criteria
in Part C of AWS D1.2. According to §3.17.5, what is the qualification status of that welder?
, A) The welder must take a separate performance qualification test
B) The welder is automatically qualified within the position and thickness limits of Table 3.7
and Table 3.8
C) The welder is qualified only for groove welds, not fillet welds
D) The welder must complete a written examination before being qualified
Correct Answer: The welder is automatically qualified within the position and thickness
limits of Table 3.7 and Table 3.8
Rationale: AWS D1.2 §3.17.5 states that a welder who completes a test weldment meeting
the WPS qualification criteria is considered qualified within the limitations of Table 3.7. The
same physical test coupon qualifies both the procedure and the welder, creating operational
efficiency.
6. Which statement accurately describes the availability of prequalified welding procedure
specifications (WPS) in AWS D1.2?
A) Prequalified WPS are available for all aluminum alloys
B) Prequalified WPS are available only for 5XXX series alloys
C) No prequalified WPS provisions exist in AWS D1.2
D) Prequalified WPS are available for fillet welds only
Correct Answer: No prequalified WPS provisions exist in AWS D1.2
Rationale: Unlike AWS D1.1 for steel, which allows prequalified procedures, AWS D1.2 has no
provisions for prequalification. Every WPS must be qualified through procedure testing per
Clause 3. This requirement exists because of the varied welding conditions possible with
semiautomatic welding variables most often used with aluminum.
7. What is the approximate melting point of aluminum?
A) 660°C (1220°F)
B) 1000°C (1832°F)
Q&A (2026)
1. Which of the following best describes the primary scope of AWS D1.2?
A) Welding requirements for aluminum pressure vessels and piping
B) Welding requirements for any type of structure made from aluminum structural alloys,
except pressure vessels and piping
C) Welding requirements for all aluminum products including castings and forgings
D) Welding requirements for aluminum sheet metal only
Correct Answer: Welding requirements for any type of structure made from aluminum
structural alloys, except pressure vessels and piping
Rationale: AWS D1.2 explicitly covers welding requirements for any type of structure made
from aluminum structural alloys. The code specifically excludes aluminum pressure vessels
and pressure piping from its scope. This distinction is critical because other codes govern
pressure-containing applications.
2. What is the primary alloying element in 5XXX series aluminum alloys?
A) Silicon
B) Zinc
C) Magnesium
D) Copper
Correct Answer: Magnesium
Rationale: Magnesium is the principal alloying element in the 5XXX series aluminum alloys.
These Al-Mg alloys provide good corrosion resistance and moderate strength. Unlike the
6XXX series which contains magnesium and silicon, the 5XXX series relies primarily on
magnesium for its properties.
,3. Why is AC current preferred for GTAW welding of aluminum?
A) It produces deeper penetration than DC
B) It provides cathodic cleaning that breaks up the aluminum oxide layer
C) It increases the filler metal deposition rate
D) It reduces the amount of shielding gas required
Correct Answer: It provides cathodic cleaning that breaks up the aluminum oxide layer
Rationale: AC current alternates between electrode positive (cleaning action) and electrode
negative (penetration). The cathodic cleaning half-cycle breaks up the tenacious aluminum
oxide layer that melts at approximately 2050°F—much higher than the base metal. This
cleaning action is essential for proper fusion and weld quality.
4. What is the maximum preheat and interpass temperature allowed for heat-treatable
aluminum alloys under AWS D1.2?
A) 150°F (65°C)
B) 200°F (93°C)
C) 250°F (120°C)
D) 350°F (177°C)
Correct Answer: 250°F (120°C)
Rationale: AWS D1.2 caps preheat and interpass temperature at 250°F (120°C) for heat-
treatable alloys and 5000-series Al-Mg alloys above 3% Mg. Excessive heat can damage
aluminum tempers and alloy families. This limit prevents strength loss and hot cracking in
these sensitive materials.
5. A welder successfully completes a test weldment that meets the WPS qualification criteria
in Part C of AWS D1.2. According to §3.17.5, what is the qualification status of that welder?
, A) The welder must take a separate performance qualification test
B) The welder is automatically qualified within the position and thickness limits of Table 3.7
and Table 3.8
C) The welder is qualified only for groove welds, not fillet welds
D) The welder must complete a written examination before being qualified
Correct Answer: The welder is automatically qualified within the position and thickness
limits of Table 3.7 and Table 3.8
Rationale: AWS D1.2 §3.17.5 states that a welder who completes a test weldment meeting
the WPS qualification criteria is considered qualified within the limitations of Table 3.7. The
same physical test coupon qualifies both the procedure and the welder, creating operational
efficiency.
6. Which statement accurately describes the availability of prequalified welding procedure
specifications (WPS) in AWS D1.2?
A) Prequalified WPS are available for all aluminum alloys
B) Prequalified WPS are available only for 5XXX series alloys
C) No prequalified WPS provisions exist in AWS D1.2
D) Prequalified WPS are available for fillet welds only
Correct Answer: No prequalified WPS provisions exist in AWS D1.2
Rationale: Unlike AWS D1.1 for steel, which allows prequalified procedures, AWS D1.2 has no
provisions for prequalification. Every WPS must be qualified through procedure testing per
Clause 3. This requirement exists because of the varied welding conditions possible with
semiautomatic welding variables most often used with aluminum.
7. What is the approximate melting point of aluminum?
A) 660°C (1220°F)
B) 1000°C (1832°F)
