ALABAMA WELDING CERTIFICATION
PRACTICE EXAM 100 QUESTIONS AND
ANSWERS WITH RATIONALES LATEST 2025-
2026UPDATE
SECTION 1: Welding Safety (1–15)
1. Which gas is commonly used in oxy-fuel welding?
A. Nitrogen
B. Oxygen
C. Helium
D. Argon
Correct Answer: B
Rationale: Oxygen supports combustion and is used with acetylene or
other fuel gases.
2. What is the primary hazard of welding galvanized steel?
A. Burns
B. Explosion
C. Zinc fumes
D. Electrical shock
Correct Answer: C
Rationale: Galvanized coatings release toxic zinc oxide fumes when
heated.
,3. Welding helmets protect against which type of radiation?
A. Alpha
B. Beta
C. Gamma
D. Ultraviolet
Correct Answer: D
Rationale: Welding arcs emit intense UV radiation that can cause arc
eye.
4. What PPE is required when welding overhead?
A. Safety glasses only
B. Leather gloves
C. Flame-resistant clothing
D. All of the above
Correct Answer: D
Rationale: Overhead welding increases exposure to sparks and molten
metal.
5. What should be done before welding in a confined space?
A. Increase amperage
B. Remove all PPE
C. Ensure proper ventilation
D. Turn off shielding gas
Correct Answer: C
Rationale: Ventilation prevents buildup of toxic gases.
,6. Which fire extinguisher is best for electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Correct Answer: C
Rationale: Class C extinguishers are designed for energized electrical
fires.
7. What causes “arc eye”?
A. Infrared radiation
B. Ultraviolet radiation
C. Heat exposure
D. Smoke inhalation
Correct Answer: B
Rationale: UV radiation burns the cornea.
8. Why should welding cables be inspected regularly?
A. Improve appearance
B. Prevent overheating
C. Increase arc length
D. Improve bead shape
Correct Answer: B
Rationale: Damaged cables can overheat or cause shock.
, 9. What is the safest way to handle compressed gas cylinders?
A. Lay them flat
B. Roll them
C. Secure them upright
D. Drop carefully
Correct Answer: C
Rationale: Cylinders must be secured upright to prevent tipping.
10. Which hazard is most associated with grinding welds?
A. Radiation
B. Flying debris
C. Toxic gas
D. Electrical shock
Correct Answer: B
Rationale: Grinding produces high-velocity metal fragments.
11. What must be removed before welding on used containers?
A. Paint only
B. Labels
C. Flammable residues
D. Rust
Correct Answer: C
Rationale: Residues can ignite or explode.
PRACTICE EXAM 100 QUESTIONS AND
ANSWERS WITH RATIONALES LATEST 2025-
2026UPDATE
SECTION 1: Welding Safety (1–15)
1. Which gas is commonly used in oxy-fuel welding?
A. Nitrogen
B. Oxygen
C. Helium
D. Argon
Correct Answer: B
Rationale: Oxygen supports combustion and is used with acetylene or
other fuel gases.
2. What is the primary hazard of welding galvanized steel?
A. Burns
B. Explosion
C. Zinc fumes
D. Electrical shock
Correct Answer: C
Rationale: Galvanized coatings release toxic zinc oxide fumes when
heated.
,3. Welding helmets protect against which type of radiation?
A. Alpha
B. Beta
C. Gamma
D. Ultraviolet
Correct Answer: D
Rationale: Welding arcs emit intense UV radiation that can cause arc
eye.
4. What PPE is required when welding overhead?
A. Safety glasses only
B. Leather gloves
C. Flame-resistant clothing
D. All of the above
Correct Answer: D
Rationale: Overhead welding increases exposure to sparks and molten
metal.
5. What should be done before welding in a confined space?
A. Increase amperage
B. Remove all PPE
C. Ensure proper ventilation
D. Turn off shielding gas
Correct Answer: C
Rationale: Ventilation prevents buildup of toxic gases.
,6. Which fire extinguisher is best for electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Correct Answer: C
Rationale: Class C extinguishers are designed for energized electrical
fires.
7. What causes “arc eye”?
A. Infrared radiation
B. Ultraviolet radiation
C. Heat exposure
D. Smoke inhalation
Correct Answer: B
Rationale: UV radiation burns the cornea.
8. Why should welding cables be inspected regularly?
A. Improve appearance
B. Prevent overheating
C. Increase arc length
D. Improve bead shape
Correct Answer: B
Rationale: Damaged cables can overheat or cause shock.
, 9. What is the safest way to handle compressed gas cylinders?
A. Lay them flat
B. Roll them
C. Secure them upright
D. Drop carefully
Correct Answer: C
Rationale: Cylinders must be secured upright to prevent tipping.
10. Which hazard is most associated with grinding welds?
A. Radiation
B. Flying debris
C. Toxic gas
D. Electrical shock
Correct Answer: B
Rationale: Grinding produces high-velocity metal fragments.
11. What must be removed before welding on used containers?
A. Paint only
B. Labels
C. Flammable residues
D. Rust
Correct Answer: C
Rationale: Residues can ignite or explode.
