Code Test Practice Exam Questions And

Aluminum Welding Certification (D1.2 Code Test) Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the AWS code applicable for structural aluminum welding?

a) AWS D1.1

b) AWS D1.2

c) AWS D1.3

d) AWS D1.6

Rationale: AWS D1.2 specifically covers structural welding of aluminum and

aluminum alloys, unlike D1.1 which is for steel.

• What shielding gas is most commonly used for GTAW aluminum?

a) Carbon dioxide

b) Helium-argon mixture 1 / 4

c) Argon

d) Nitrogen

Rationale: Argon provides stable arc characteristics and good cleaning

action for aluminum oxide removal.

• What polarity is used for GTAW of aluminum?

a) DCEN

b) AC

c) DCEP

d) DC variable polarity

Rationale: Alternating current (AC) allows for both penetration and oxide

cleaning on aluminum surfaces.

• What is the main purpose of preheating aluminum before welding?

a) To increase hardness

b) To reduce thermal shock and prevent cracking

c) To remove hydrogen

d) To lower melting point

Rationale: Preheating minimizes thermal stresses due to aluminum’s high

thermal conductivity.

• / 4

• Which filler metal is commonly used for welding 6061-T6 aluminum?

a) ER4047

b) ER4043

c) ER5356

d) ER2319

Rationale: ER4043 is often used with 6061-T6 for good weldability and crack

resistance.

• What is the recommended cleaning method before welding aluminum?

a) Sandblasting

b) Solvent only

c) Mechanical and chemical cleaning

d) None

Rationale: Both oxide removal and degreasing are necessary for clean,

defect-free welds.

• What type of current is used for GMAW aluminum welding?

a) DCEN

b) AC

c) DCEP

d) Pulsed DC

Rationale: GMAW of aluminum uses direct current electrode positive (DCEP)

to achieve good metal transfer. 3 / 4

• Which transfer mode is best for welding thin aluminum sections with

GMAW?

a) Globular

b) Short circuit

c) Spray transfer

d) Pulsed arc

Rationale: Spray transfer gives stable arcs and low spatter for thin materials.

• What happens if the aluminum oxide layer is not removed before

welding?

a) It improves arc stability

b) It prevents distortion

c) It causes lack of fusion

d) It reduces porosity

Rationale: Aluminum oxide has a high melting point, leading to fusion

defects if not cleaned.

• What is the melting point of pure aluminum?
• 1100°F
• 900°F
• 1220°F (660°C)
• / 4