AWS Certified Welder Structural Steel
D1 1 Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
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1. What is the maximum allowable undercut for a fillet weld with a leg size
of 1/4 inch in a primary structural member?
a) 1/64 inch
b) 1/32 inch
c) 1/16 inch
d) 3/64 inch
b) 1/32 inch
According to AWS D1.1 Table 6.1, the maximum allowable undercut for a fillet
weld with a leg size of 1/4 inch is 1/32 inch (0.8mm) when the weld is
transverse to tensile stress in primary structural members.
2. What is the minimum length of a fillet weld if the weld size is 3/16 inch?
a) 3/4 inch
b) 1 inch
c) 1-1/2 inches
d) 2 inches
a) 3/4 inch
Per AWS D1.1 Clause 6.6.2, fillet welds shall have a minimum length of at
least four times the nominal weld size. For a 3/16 inch weld, 4 × 3/16 = 3/4
inch.
3. What is the minimum preheat temperature for welding ASTM A36 steel
that is 1-1/2 inches thick?
, a) 32°F
b) 50°F
c) 150°F
d) 225°F
c) 150°F
AWS D1.1 Table 3.2 specifies minimum preheat temperatures based on
material thickness. For A36 steel in Category A with thickness of 1-1/2 inches
(over 3/4 inch to 1-1/2 inch), the minimum preheat is 150°F.
4. What is the maximum root opening allowed for a complete joint
penetration groove weld with a backing bar?
a) 1/16 inch
b) 3/16 inch
c) 1/4 inch
d) 3/8 inch
c) 1/4 inch
Per AWS D1.1 Clause 3.7.4, the maximum root opening for groove welds with
backing is 1/4 inch unless otherwise specified. The minimum is typically 1/4
inch for SMAW with backing.
5. What is the minimum electrode extension for FCAW-G welding?
a) 1/4 inch
b) 1/2 inch
c) 3/4 inch
d) 1 inch
c) 3/4 inch
AWS D1.1 Clause 6.15.3 specifies that for FCAW-G (gas shielded flux cored arc
welding), the electrode extension should be between 3/4 inch and 3-1/2
inches, with 3/4 inch being the minimum.
6. What does the "F" number indicate on an electrode classification?
a) Tensile strength
b) Welding position
, c) Usability and coating type
d) Hydrogen content
c) Usability and coating type
The "F" number in AWS electrode classification indicates the usability and
coating characteristics of the electrode, which helps determine the
appropriate welding current and technique.
7. What is the maximum allowable porosity for a fillet weld in a statically
loaded structure?
a) No porosity is allowed
b) 1/16 inch diameter
c) 3/32 inch diameter
d) 1/8 inch diameter
c) 3/32 inch diameter
AWS D1.1 Table 6.1 allows porosity up to 3/32 inch (2.4mm) diameter for
statically loaded structures in fillet welds, unless project specifications require
more stringent criteria.
8. What is the required minimum length for weld tabs?
a) 1 inch
b) 2 inches
c) 3 inches
d) 4 inches
c) 3 inches
AWS D1.1 Clause 3.13.3 requires weld tabs to extend at least 3 inches beyond
the joint so that adequate weld quality can be achieved at the ends of the
joint.
9. What is the minimum thickness for backing bars used in groove welds?
a) 1/8 inch
b) 1/4 inch
c) 3/8 inch
d) 1/2 inch
b) 1/4 inch
D1 1 Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. What is the maximum allowable undercut for a fillet weld with a leg size
of 1/4 inch in a primary structural member?
a) 1/64 inch
b) 1/32 inch
c) 1/16 inch
d) 3/64 inch
b) 1/32 inch
According to AWS D1.1 Table 6.1, the maximum allowable undercut for a fillet
weld with a leg size of 1/4 inch is 1/32 inch (0.8mm) when the weld is
transverse to tensile stress in primary structural members.
2. What is the minimum length of a fillet weld if the weld size is 3/16 inch?
a) 3/4 inch
b) 1 inch
c) 1-1/2 inches
d) 2 inches
a) 3/4 inch
Per AWS D1.1 Clause 6.6.2, fillet welds shall have a minimum length of at
least four times the nominal weld size. For a 3/16 inch weld, 4 × 3/16 = 3/4
inch.
3. What is the minimum preheat temperature for welding ASTM A36 steel
that is 1-1/2 inches thick?
, a) 32°F
b) 50°F
c) 150°F
d) 225°F
c) 150°F
AWS D1.1 Table 3.2 specifies minimum preheat temperatures based on
material thickness. For A36 steel in Category A with thickness of 1-1/2 inches
(over 3/4 inch to 1-1/2 inch), the minimum preheat is 150°F.
4. What is the maximum root opening allowed for a complete joint
penetration groove weld with a backing bar?
a) 1/16 inch
b) 3/16 inch
c) 1/4 inch
d) 3/8 inch
c) 1/4 inch
Per AWS D1.1 Clause 3.7.4, the maximum root opening for groove welds with
backing is 1/4 inch unless otherwise specified. The minimum is typically 1/4
inch for SMAW with backing.
5. What is the minimum electrode extension for FCAW-G welding?
a) 1/4 inch
b) 1/2 inch
c) 3/4 inch
d) 1 inch
c) 3/4 inch
AWS D1.1 Clause 6.15.3 specifies that for FCAW-G (gas shielded flux cored arc
welding), the electrode extension should be between 3/4 inch and 3-1/2
inches, with 3/4 inch being the minimum.
6. What does the "F" number indicate on an electrode classification?
a) Tensile strength
b) Welding position
, c) Usability and coating type
d) Hydrogen content
c) Usability and coating type
The "F" number in AWS electrode classification indicates the usability and
coating characteristics of the electrode, which helps determine the
appropriate welding current and technique.
7. What is the maximum allowable porosity for a fillet weld in a statically
loaded structure?
a) No porosity is allowed
b) 1/16 inch diameter
c) 3/32 inch diameter
d) 1/8 inch diameter
c) 3/32 inch diameter
AWS D1.1 Table 6.1 allows porosity up to 3/32 inch (2.4mm) diameter for
statically loaded structures in fillet welds, unless project specifications require
more stringent criteria.
8. What is the required minimum length for weld tabs?
a) 1 inch
b) 2 inches
c) 3 inches
d) 4 inches
c) 3 inches
AWS D1.1 Clause 3.13.3 requires weld tabs to extend at least 3 inches beyond
the joint so that adequate weld quality can be achieved at the ends of the
joint.
9. What is the minimum thickness for backing bars used in groove welds?
a) 1/8 inch
b) 1/4 inch
c) 3/8 inch
d) 1/2 inch
b) 1/4 inch
