NCCER Welding Certification Practice Examination
Newest 2025–2026 Update | Complete Test Bank
Featuring 150 Most Tested Questions and 100%
Verified Answers with Detailed Rationales | Based
on Current NCCER Welding 6th Edition Curriculum
| Tutor Verified Success | Grade A+ | Instant
Download PDF
1. Which process uses a continuously fed consumable electrode and shielding
gas?
A. SMAW
B. GTAW
C. GMAW
D. FCAW
✔ Correct Answer: C. GMAW (Gas Metal Arc Welding)
Explanation: GMAW uses a continuously fed wire electrode and shielding
gas to protect the weld pool.
2. What is the primary purpose of flux in SMAW?
A. Increase current
B. Stabilize arc and protect weld
C. Cool electrode
D. Increase penetration
✔ Correct Answer: B. Stabilize arc and protect weld
Explanation: Flux forms a shielding gas and slag that protects the molten
weld from contamination.
3. Which polarity provides deeper penetration in most welding processes?
A. AC
, B. DCEN
C. DCEP
D. Pulsed DC
✔ Correct Answer: C. DCEP (Direct Current Electrode Positive)
Explanation: DCEP drives heat into the workpiece, resulting in deeper
penetration.
4. What defect is caused by gas trapped in solidifying weld metal?
A. Undercut
B. Porosity
C. Slag inclusion
D. Cracking
✔ Correct Answer: B. Porosity
Explanation: Porosity occurs when gas pockets become trapped during
solidification.
5. Which tool is used to remove slag after welding?
A. Wire brush
B. Chipping hammer
C. Grinder
D. File
✔ Correct Answer: B. Chipping hammer
Explanation: A chipping hammer is specifically designed to break and
remove slag.
6. What is the standard angle for a fillet weld?
A. 30°
B. 45°
C. 60°
D. 90°
✔ Correct Answer: B. 45°
Explanation: Fillet welds typically form a 45° triangular cross-section.
,7. Which gas is commonly used for TIG welding of stainless steel?
A. Oxygen
B. Argon
C. Nitrogen
D. Helium only
✔ Correct Answer: B. Argon
Explanation: Argon provides stable arc and shielding for TIG welding.
8. What is the main hazard of welding fumes?
A. Fire
B. Electric shock
C. Respiratory issues
D. Noise
✔ Correct Answer: C. Respiratory issues
Explanation: Welding fumes contain harmful particles that affect lungs.
9. What does PPE stand for?
A. Personal Power Equipment
B. Protective Process Equipment
C. Personal Protective Equipment
D. Power Protection Element
✔ Correct Answer: C. Personal Protective Equipment
Explanation: PPE protects welders from hazards like heat, sparks, and
fumes.
10.Which welding position is considered the most difficult?
A. Flat
B. Horizontal
C. Vertical
D. Overhead
✔ Correct Answer: D. Overhead
Explanation: Overhead welding is challenging due to gravity affecting
molten metal.
, 11.What causes undercut in welding?
A. Low current
B. Excessive heat and speed
C. Incorrect electrode
D. Poor shielding gas
✔ Correct Answer: B. Excessive heat and speed
Explanation: High heat melts base metal edges without proper fill.
12.Which electrode is commonly used for mild steel in SMAW?
A. E6010
B. E308
C. E4043
D. E11018
✔ Correct Answer: A. E6010
Explanation: E6010 is widely used for deep penetration in mild steel.
13.What is the purpose of a welding helmet?
A. Prevent sparks only
B. Protect eyes and face
C. Reduce heat
D. Improve visibility
✔ Correct Answer: B. Protect eyes and face
Explanation: Helmets protect from UV radiation, sparks, and heat.
14.What is arc length?
A. Distance between electrode and workpiece
B. Length of weld
C. Width of weld
D. Depth of penetration
✔ Correct Answer: A. Distance between electrode and workpiece
Explanation: Arc length affects heat and weld quality.
15.Which process does NOT require shielding gas?
A. GMAW
Newest 2025–2026 Update | Complete Test Bank
Featuring 150 Most Tested Questions and 100%
Verified Answers with Detailed Rationales | Based
on Current NCCER Welding 6th Edition Curriculum
| Tutor Verified Success | Grade A+ | Instant
Download PDF
1. Which process uses a continuously fed consumable electrode and shielding
gas?
A. SMAW
B. GTAW
C. GMAW
D. FCAW
✔ Correct Answer: C. GMAW (Gas Metal Arc Welding)
Explanation: GMAW uses a continuously fed wire electrode and shielding
gas to protect the weld pool.
2. What is the primary purpose of flux in SMAW?
A. Increase current
B. Stabilize arc and protect weld
C. Cool electrode
D. Increase penetration
✔ Correct Answer: B. Stabilize arc and protect weld
Explanation: Flux forms a shielding gas and slag that protects the molten
weld from contamination.
3. Which polarity provides deeper penetration in most welding processes?
A. AC
, B. DCEN
C. DCEP
D. Pulsed DC
✔ Correct Answer: C. DCEP (Direct Current Electrode Positive)
Explanation: DCEP drives heat into the workpiece, resulting in deeper
penetration.
4. What defect is caused by gas trapped in solidifying weld metal?
A. Undercut
B. Porosity
C. Slag inclusion
D. Cracking
✔ Correct Answer: B. Porosity
Explanation: Porosity occurs when gas pockets become trapped during
solidification.
5. Which tool is used to remove slag after welding?
A. Wire brush
B. Chipping hammer
C. Grinder
D. File
✔ Correct Answer: B. Chipping hammer
Explanation: A chipping hammer is specifically designed to break and
remove slag.
6. What is the standard angle for a fillet weld?
A. 30°
B. 45°
C. 60°
D. 90°
✔ Correct Answer: B. 45°
Explanation: Fillet welds typically form a 45° triangular cross-section.
,7. Which gas is commonly used for TIG welding of stainless steel?
A. Oxygen
B. Argon
C. Nitrogen
D. Helium only
✔ Correct Answer: B. Argon
Explanation: Argon provides stable arc and shielding for TIG welding.
8. What is the main hazard of welding fumes?
A. Fire
B. Electric shock
C. Respiratory issues
D. Noise
✔ Correct Answer: C. Respiratory issues
Explanation: Welding fumes contain harmful particles that affect lungs.
9. What does PPE stand for?
A. Personal Power Equipment
B. Protective Process Equipment
C. Personal Protective Equipment
D. Power Protection Element
✔ Correct Answer: C. Personal Protective Equipment
Explanation: PPE protects welders from hazards like heat, sparks, and
fumes.
10.Which welding position is considered the most difficult?
A. Flat
B. Horizontal
C. Vertical
D. Overhead
✔ Correct Answer: D. Overhead
Explanation: Overhead welding is challenging due to gravity affecting
molten metal.
, 11.What causes undercut in welding?
A. Low current
B. Excessive heat and speed
C. Incorrect electrode
D. Poor shielding gas
✔ Correct Answer: B. Excessive heat and speed
Explanation: High heat melts base metal edges without proper fill.
12.Which electrode is commonly used for mild steel in SMAW?
A. E6010
B. E308
C. E4043
D. E11018
✔ Correct Answer: A. E6010
Explanation: E6010 is widely used for deep penetration in mild steel.
13.What is the purpose of a welding helmet?
A. Prevent sparks only
B. Protect eyes and face
C. Reduce heat
D. Improve visibility
✔ Correct Answer: B. Protect eyes and face
Explanation: Helmets protect from UV radiation, sparks, and heat.
14.What is arc length?
A. Distance between electrode and workpiece
B. Length of weld
C. Width of weld
D. Depth of penetration
✔ Correct Answer: A. Distance between electrode and workpiece
Explanation: Arc length affects heat and weld quality.
15.Which process does NOT require shielding gas?
A. GMAW
