UA Steamfitter Welder Qualification
Exam With Actual Questions & Verified
Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. Which of the following is the primary purpose of preheating
carbon steel before welding?
A. To improve weld appearance
B. To reduce thermal conductivity
C. To reduce the risk of cracking
D. To decrease welding time
C. To reduce the risk of cracking
Preheating helps slow the cooling rate of the weld, reducing residual
stresses and the risk of hydrogen-induced cracking, particularly in
carbon steel.
2. What is the typical maximum interpass temperature for low-
carbon steel welds?
A. 200°F (93°C)
B. 300°F (149°C)
C. 400°F (204°C)
D. 500°F (260°C)
,C. 400°F (204°C)
Maintaining interpass temperatures within limits prevents
overheating, which can degrade mechanical properties and increase
the risk of weld defects.
3. In welding, what does “root pass” refer to?
A. The first pass of filler metal at the joint root
B. The last finishing pass of the weld
C. A decorative weld layer
D. An experimental pass
A. The first pass of filler metal at the joint root
The root pass is crucial for fusion at the base of the joint and
establishes the foundation for subsequent passes.
4. Which welding process is commonly used for steamfitter high-
pressure pipe welds?
A. Oxyacetylene welding
B. SMAW (Stick)
C. TIG (GTAW)
D. MIG (GMAW)
C. TIG (GTAW)
TIG welding provides high-quality, precise welds required for pressure
piping with critical integrity.
5. Which factor is most important when selecting filler metal for a
carbon steel pipe weld?
A. Appearance
B. Composition and strength match
C. Color
D. Manufacturer
,B. Composition and strength match
The filler metal must match or exceed the base metal's mechanical
properties and chemical composition to ensure weld integrity.
6. What is the recommended bevel angle for a single-V groove on
carbon steel pipe 6 inches in diameter?
A. 15°
B. 30°
C. 37.5°
D. 45°
C. 37.5°
A 37.5° bevel provides adequate access for root and fill passes while
minimizing excessive weld metal.
7. Which NDE method is most commonly used to detect internal
weld defects in steam piping?
A. Visual inspection
B. Magnetic particle testing
C. Radiographic testing (X-ray)
D. Dye penetrant testing
C. Radiographic testing (X-ray)
Radiography can reveal internal flaws such as porosity, slag
inclusions, or incomplete fusion that are not visible externally.
8. What is the primary purpose of backgouging a weld root?
A. To reduce weld size
B. To remove defective weld metal and ensure complete
penetration
C. To smooth the weld for aesthetics
D. To increase heat input
, B. To remove defective weld metal and ensure complete penetration
Backgouging ensures the root is fully penetrated and free of defects
before subsequent passes.
9. What is a common defect caused by excessive welding speed?
A. Undercut
B. Overlap
C. Porosity
D. Crater cracks
C. Porosity
Excessive travel speed can trap gases in the weld metal, creating
porosity.
10. In SMAW, what type of electrode is typically used for high-
temperature steam piping?
A. E6010
B. E7018
C. E308L
D. E309
B. E7018
E7018 is a low-hydrogen electrode suitable for high-strength carbon
steel welds in high-temperature service.
11. What is the primary purpose of post-weld heat treatment
(PWHT)?
A. Improve weld appearance
B. Relieve residual stresses and reduce hardness
C. Accelerate cooling
D. Facilitate filler metal deposition
Exam With Actual Questions & Verified
Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. Which of the following is the primary purpose of preheating
carbon steel before welding?
A. To improve weld appearance
B. To reduce thermal conductivity
C. To reduce the risk of cracking
D. To decrease welding time
C. To reduce the risk of cracking
Preheating helps slow the cooling rate of the weld, reducing residual
stresses and the risk of hydrogen-induced cracking, particularly in
carbon steel.
2. What is the typical maximum interpass temperature for low-
carbon steel welds?
A. 200°F (93°C)
B. 300°F (149°C)
C. 400°F (204°C)
D. 500°F (260°C)
,C. 400°F (204°C)
Maintaining interpass temperatures within limits prevents
overheating, which can degrade mechanical properties and increase
the risk of weld defects.
3. In welding, what does “root pass” refer to?
A. The first pass of filler metal at the joint root
B. The last finishing pass of the weld
C. A decorative weld layer
D. An experimental pass
A. The first pass of filler metal at the joint root
The root pass is crucial for fusion at the base of the joint and
establishes the foundation for subsequent passes.
4. Which welding process is commonly used for steamfitter high-
pressure pipe welds?
A. Oxyacetylene welding
B. SMAW (Stick)
C. TIG (GTAW)
D. MIG (GMAW)
C. TIG (GTAW)
TIG welding provides high-quality, precise welds required for pressure
piping with critical integrity.
5. Which factor is most important when selecting filler metal for a
carbon steel pipe weld?
A. Appearance
B. Composition and strength match
C. Color
D. Manufacturer
,B. Composition and strength match
The filler metal must match or exceed the base metal's mechanical
properties and chemical composition to ensure weld integrity.
6. What is the recommended bevel angle for a single-V groove on
carbon steel pipe 6 inches in diameter?
A. 15°
B. 30°
C. 37.5°
D. 45°
C. 37.5°
A 37.5° bevel provides adequate access for root and fill passes while
minimizing excessive weld metal.
7. Which NDE method is most commonly used to detect internal
weld defects in steam piping?
A. Visual inspection
B. Magnetic particle testing
C. Radiographic testing (X-ray)
D. Dye penetrant testing
C. Radiographic testing (X-ray)
Radiography can reveal internal flaws such as porosity, slag
inclusions, or incomplete fusion that are not visible externally.
8. What is the primary purpose of backgouging a weld root?
A. To reduce weld size
B. To remove defective weld metal and ensure complete
penetration
C. To smooth the weld for aesthetics
D. To increase heat input
, B. To remove defective weld metal and ensure complete penetration
Backgouging ensures the root is fully penetrated and free of defects
before subsequent passes.
9. What is a common defect caused by excessive welding speed?
A. Undercut
B. Overlap
C. Porosity
D. Crater cracks
C. Porosity
Excessive travel speed can trap gases in the weld metal, creating
porosity.
10. In SMAW, what type of electrode is typically used for high-
temperature steam piping?
A. E6010
B. E7018
C. E308L
D. E309
B. E7018
E7018 is a low-hydrogen electrode suitable for high-strength carbon
steel welds in high-temperature service.
11. What is the primary purpose of post-weld heat treatment
(PWHT)?
A. Improve weld appearance
B. Relieve residual stresses and reduce hardness
C. Accelerate cooling
D. Facilitate filler metal deposition
