Structural Steel and Bridge Welding
Certification (DOT-Specific) Practice
Exam 100 Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant
Download Pdf
1. Which welding code is most commonly referenced for DOT structural steel
and bridge welding in the United States?
A. AWS D1.1
B. AWS D1.5
C. ASME Section IX
D. API 1104
AWS D1.5 is the AASHTO/AWS Bridge Welding Code, developed specifically
for bridge welding applications and widely adopted by DOT agencies.
2. What is the primary base material category covered under bridge welding
codes?
A. Aluminum alloys
B. Stainless steels
C. Carbon and low-alloy structural steels
D. Cast iron
Bridge structures are predominantly fabricated from carbon and low-alloy
structural steels, which are the primary materials addressed by AWS D1.5.
3. Who has final authority to accept or reject welds on a DOT bridge project?
A. The welder
B. The contractor
,C. The owner's representative or inspector
D. The steel supplier
DOT inspectors or owner representatives are responsible for final weld
acceptance on bridge projects.
4. Which discontinuity is generally considered unacceptable regardless of size
in bridge welds?
A. Undercut within limits
B. Porosity
C. Cracks
D. Overlap
Cracks are never acceptable in structural or bridge welds due to safety
concerns, regardless of size.
5. Preheat is primarily used in structural steel welding to reduce the risk of:
A. Excess reinforcement
B. Hydrogen-induced cracking
C. Distortion
D. Slag inclusion
Preheating slows the cooling rate and reduces hydrogen cracking
susceptibility in carbon and low-alloy steels.
6. Which electrode classification is commonly used for bridge welding
requiring low-hydrogen control?
A. E6010
B. E6013
C. E7018
D. E7024
E7018 is a low-hydrogen electrode widely specified for structural and bridge
applications where hydrogen control is critical.
7. What joint type is most common in bridge girder fabrication?
A. Lap joint
B. Corner joint
C. Butt (groove) joint
D. Edge joint
, Groove welds provide the full-strength continuity required in bridge girders
and are the most common joint type.
8. Which welding position is designated as "4G"?
A. Flat groove
B. Horizontal groove
C. Vertical groove
D. Overhead groove
4G indicates an overhead groove welding position.
9. Which process is most commonly used in shop fabrication of bridge
components?
A. Oxy-fuel welding
B. Shielded Metal Arc Welding (SMAW)
C. Submerged Arc Welding
D. Plasma Arc Welding
SMAW is widely used in shop fabrication of bridge components due to its
versatility and suitability for structural joints.
10. What is the minimum base metal thickness for which AWS D1.5 applies?
A. 1/16 inch
B. 1/8 inch (3 mm) and thicker
C. 1/4 inch
D. 1/2 inch
AWS D1.5 applies to the welding of base metals 3 mm and thicker, which is
approximately 1/8 inch.
11. AWS D1.5 is a joint publication of which two organizations?
A. AWS and ASME
B. AWS and AASHTO
C. AASHTO and API
D. AWS and ASTM
AWS D1.5 is issued jointly by the American Welding Society (AWS) and the
American Association of State Highway and Transportation Officials
(AASHTO).
Certification (DOT-Specific) Practice
Exam 100 Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant
Download Pdf
1. Which welding code is most commonly referenced for DOT structural steel
and bridge welding in the United States?
A. AWS D1.1
B. AWS D1.5
C. ASME Section IX
D. API 1104
AWS D1.5 is the AASHTO/AWS Bridge Welding Code, developed specifically
for bridge welding applications and widely adopted by DOT agencies.
2. What is the primary base material category covered under bridge welding
codes?
A. Aluminum alloys
B. Stainless steels
C. Carbon and low-alloy structural steels
D. Cast iron
Bridge structures are predominantly fabricated from carbon and low-alloy
structural steels, which are the primary materials addressed by AWS D1.5.
3. Who has final authority to accept or reject welds on a DOT bridge project?
A. The welder
B. The contractor
,C. The owner's representative or inspector
D. The steel supplier
DOT inspectors or owner representatives are responsible for final weld
acceptance on bridge projects.
4. Which discontinuity is generally considered unacceptable regardless of size
in bridge welds?
A. Undercut within limits
B. Porosity
C. Cracks
D. Overlap
Cracks are never acceptable in structural or bridge welds due to safety
concerns, regardless of size.
5. Preheat is primarily used in structural steel welding to reduce the risk of:
A. Excess reinforcement
B. Hydrogen-induced cracking
C. Distortion
D. Slag inclusion
Preheating slows the cooling rate and reduces hydrogen cracking
susceptibility in carbon and low-alloy steels.
6. Which electrode classification is commonly used for bridge welding
requiring low-hydrogen control?
A. E6010
B. E6013
C. E7018
D. E7024
E7018 is a low-hydrogen electrode widely specified for structural and bridge
applications where hydrogen control is critical.
7. What joint type is most common in bridge girder fabrication?
A. Lap joint
B. Corner joint
C. Butt (groove) joint
D. Edge joint
, Groove welds provide the full-strength continuity required in bridge girders
and are the most common joint type.
8. Which welding position is designated as "4G"?
A. Flat groove
B. Horizontal groove
C. Vertical groove
D. Overhead groove
4G indicates an overhead groove welding position.
9. Which process is most commonly used in shop fabrication of bridge
components?
A. Oxy-fuel welding
B. Shielded Metal Arc Welding (SMAW)
C. Submerged Arc Welding
D. Plasma Arc Welding
SMAW is widely used in shop fabrication of bridge components due to its
versatility and suitability for structural joints.
10. What is the minimum base metal thickness for which AWS D1.5 applies?
A. 1/16 inch
B. 1/8 inch (3 mm) and thicker
C. 1/4 inch
D. 1/2 inch
AWS D1.5 applies to the welding of base metals 3 mm and thicker, which is
approximately 1/8 inch.
11. AWS D1.5 is a joint publication of which two organizations?
A. AWS and ASME
B. AWS and AASHTO
C. AASHTO and API
D. AWS and ASTM
AWS D1.5 is issued jointly by the American Welding Society (AWS) and the
American Association of State Highway and Transportation Officials
(AASHTO).
