AWS Certified Welder Structural Steel
D1.1 Exam With Actual Questions &
Verified Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. Which welding process is most commonly used for structural steel
in accordance with AWS D1.1?
A. Oxy-acetylene welding
B. Gas tungsten arc welding (GTAW)
C. Shielded metal arc welding (SMAW)
D. Plasma arc welding
Answer: C. Shielded metal arc welding (SMAW)
Rationale: SMAW is widely used for structural steel because of its
portability, versatility, and suitability for field conditions, as referenced
in AWS D1.1.
2. What is the minimum preheat temperature for carbon steel with
a thickness of 1 inch and carbon equivalent of 0.45%?
A. 100°F
B. 150°F
C. 200°F
D. 250°F
,Answer: B. 150°F
Rationale: Preheat requirements depend on carbon equivalent and
thickness; for 1-inch steel with CE ~0.45%, AWS D1.1 specifies 150°F
minimum.
3. What is the primary purpose of preheating prior to welding?
A. Improve weld aesthetics
B. Reduce hydrogen-induced cracking
C. Increase welding speed
D. Reduce slag formation
Answer: B. Reduce hydrogen-induced cracking
Rationale: Preheating slows the cooling rate, reducing residual stresses
and minimizing the risk of hydrogen-induced cold cracking.
4. Which electrode type is suitable for all-position welding of low-
alloy steels?
A. E6010
B. E6013
C. E7018
D. E7024
Answer: C. E7018
Rationale: E7018 is a low-hydrogen electrode suitable for all-position
welding, widely used in structural applications.
5. Fillet welds are primarily used to:
A. Join the ends of two plates in the same plane
B. Join two members at a right angle
C. Provide decorative edges
D. Fill holes in castings
,Answer: B. Join two members at a right angle
Rationale: Fillet welds are used to join perpendicular members, such as
in T-joints or lap joints.
6. What is the minimum weld size for a fillet weld on a 1/4-inch thick
plate?
A. 1/8 inch
B. 3/16 inch
C. 1/4 inch
D. 5/16 inch
Answer: B. 3/16 inch
Rationale: AWS D1.1 specifies minimum fillet weld sizes based on
material thickness to ensure adequate strength.
7. The term “interpass temperature” refers to:
A. Temperature of the electrode
B. Temperature of the weld metal
C. Maximum temperature between welding passes
D. Ambient temperature during welding
Answer: C. Maximum temperature between welding passes
Rationale: Maintaining interpass temperature within limits prevents
overheating, which can lead to cracking or weld defects.
8. What is the maximum allowable hydrogen content in a low-
hydrogen electrode?
A. 2 ml/100g weld metal
B. 5 ml/100g weld metal
C. 10 ml/100g weld metal
D. 15 ml/100g weld metal
, Answer: B. 5 ml/100g weld metal
Rationale: Low-hydrogen electrodes (like E7018) are designed to limit
hydrogen content to reduce cracking risk.
9. Backing bars are typically used to:
A. Support the electrode
B. Ensure full penetration welds
C. Increase electrode life
D. Reduce weld spatter
Answer: B. Ensure full penetration welds
Rationale: Backing bars provide support for the molten weld,
preventing burn-through and ensuring proper penetration.
10. Which joint design is preferred for thick structural plates to
achieve full penetration?
A. Square butt joint
B. Single-V butt joint
C. Lap joint
D. Fillet joint
Answer: B. Single-V butt joint
Rationale: Single-V or double-V butt joints are used on thick plates to
allow full penetration and proper weld fusion.
11. Cracks in a weld are most likely caused by:
A. Proper electrode selection
B. Excessive preheat
C. Rapid cooling or high restraint
D. Low welding current
Answer: C. Rapid cooling or high restraint
Rationale: Rapid cooling or high residual stress can lead to hydrogen
cracking or other weld fractures.
D1.1 Exam With Actual Questions &
Verified Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. Which welding process is most commonly used for structural steel
in accordance with AWS D1.1?
A. Oxy-acetylene welding
B. Gas tungsten arc welding (GTAW)
C. Shielded metal arc welding (SMAW)
D. Plasma arc welding
Answer: C. Shielded metal arc welding (SMAW)
Rationale: SMAW is widely used for structural steel because of its
portability, versatility, and suitability for field conditions, as referenced
in AWS D1.1.
2. What is the minimum preheat temperature for carbon steel with
a thickness of 1 inch and carbon equivalent of 0.45%?
A. 100°F
B. 150°F
C. 200°F
D. 250°F
,Answer: B. 150°F
Rationale: Preheat requirements depend on carbon equivalent and
thickness; for 1-inch steel with CE ~0.45%, AWS D1.1 specifies 150°F
minimum.
3. What is the primary purpose of preheating prior to welding?
A. Improve weld aesthetics
B. Reduce hydrogen-induced cracking
C. Increase welding speed
D. Reduce slag formation
Answer: B. Reduce hydrogen-induced cracking
Rationale: Preheating slows the cooling rate, reducing residual stresses
and minimizing the risk of hydrogen-induced cold cracking.
4. Which electrode type is suitable for all-position welding of low-
alloy steels?
A. E6010
B. E6013
C. E7018
D. E7024
Answer: C. E7018
Rationale: E7018 is a low-hydrogen electrode suitable for all-position
welding, widely used in structural applications.
5. Fillet welds are primarily used to:
A. Join the ends of two plates in the same plane
B. Join two members at a right angle
C. Provide decorative edges
D. Fill holes in castings
,Answer: B. Join two members at a right angle
Rationale: Fillet welds are used to join perpendicular members, such as
in T-joints or lap joints.
6. What is the minimum weld size for a fillet weld on a 1/4-inch thick
plate?
A. 1/8 inch
B. 3/16 inch
C. 1/4 inch
D. 5/16 inch
Answer: B. 3/16 inch
Rationale: AWS D1.1 specifies minimum fillet weld sizes based on
material thickness to ensure adequate strength.
7. The term “interpass temperature” refers to:
A. Temperature of the electrode
B. Temperature of the weld metal
C. Maximum temperature between welding passes
D. Ambient temperature during welding
Answer: C. Maximum temperature between welding passes
Rationale: Maintaining interpass temperature within limits prevents
overheating, which can lead to cracking or weld defects.
8. What is the maximum allowable hydrogen content in a low-
hydrogen electrode?
A. 2 ml/100g weld metal
B. 5 ml/100g weld metal
C. 10 ml/100g weld metal
D. 15 ml/100g weld metal
, Answer: B. 5 ml/100g weld metal
Rationale: Low-hydrogen electrodes (like E7018) are designed to limit
hydrogen content to reduce cracking risk.
9. Backing bars are typically used to:
A. Support the electrode
B. Ensure full penetration welds
C. Increase electrode life
D. Reduce weld spatter
Answer: B. Ensure full penetration welds
Rationale: Backing bars provide support for the molten weld,
preventing burn-through and ensuring proper penetration.
10. Which joint design is preferred for thick structural plates to
achieve full penetration?
A. Square butt joint
B. Single-V butt joint
C. Lap joint
D. Fillet joint
Answer: B. Single-V butt joint
Rationale: Single-V or double-V butt joints are used on thick plates to
allow full penetration and proper weld fusion.
11. Cracks in a weld are most likely caused by:
A. Proper electrode selection
B. Excessive preheat
C. Rapid cooling or high restraint
D. Low welding current
Answer: C. Rapid cooling or high restraint
Rationale: Rapid cooling or high residual stress can lead to hydrogen
cracking or other weld fractures.
