Welding Certification Exam Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
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1. What is the primary purpose of flux in welding?
A. Increase current flow
B. Protect molten weld pool from contamination
C. Cool the weld area
D. Strengthen the base metal
Flux shields the molten metal from atmospheric gases like
oxygen and nitrogen that can weaken the weld.
2. Which welding process uses a consumable electrode coated in
flux?
A. TIG
B. MIG
C. SMAW
D. FCAW
Shielded Metal Arc Welding (SMAW) uses a flux-coated electrode
that melts during welding.
3. What does MIG stand for?
A. Metal Internal Gas
B. Mechanical Inert Gas
C. Metal Inert Gas
D. Molten Iron Gas
MIG welding uses an inert gas to protect the weld pool.
,4. Which gas is commonly used in TIG welding?
A. Oxygen
B. Nitrogen
C. Argon
D. Carbon dioxide
Argon is an inert gas that protects the weld from contamination.
5. What type of current is commonly used in SMAW?
A. AC only
B. DC only
C. AC or DC
D. Pulsed current only
SMAW can operate using either AC or DC depending on electrode
type.
6. What is slag in welding?
A. Melted base metal
B. Non-metallic residue from flux
C. Excess electrode material
D. Cooling compound
Slag forms from flux and must be removed after welding.
7. What is the purpose of a welding helmet?
A. Improve visibility
B. Reduce noise
C. Protect eyes and face from arc radiation
D. Increase precision
The helmet shields against UV/IR radiation and sparks.
8. What defect is caused by trapped gas in a weld?
A. Cracking
, B. Undercut
C. Porosity
D. Spatter
Porosity appears as small holes due to gas entrapment.
9. Which process produces the cleanest weld?
A. SMAW
B. FCAW
C. TIG
D. Oxy-acetylene
TIG welding produces high-quality, clean welds with minimal
spatter.
10. What is the melting point of steel approximately?
A. 500°C
B. 1000°C
C. 1370–1500°C
D. 2000°C
Steel melts within this temperature range depending on
composition.
11. What is a fillet weld?
A. Weld on flat surface
B. Weld joining two surfaces at right angles
C. Edge weld
D. Groove weld
Fillet welds are triangular and used in T-joints.
12. What causes undercut in welding?
A. Low voltage
B. Slow travel speed
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
1. What is the primary purpose of flux in welding?
A. Increase current flow
B. Protect molten weld pool from contamination
C. Cool the weld area
D. Strengthen the base metal
Flux shields the molten metal from atmospheric gases like
oxygen and nitrogen that can weaken the weld.
2. Which welding process uses a consumable electrode coated in
flux?
A. TIG
B. MIG
C. SMAW
D. FCAW
Shielded Metal Arc Welding (SMAW) uses a flux-coated electrode
that melts during welding.
3. What does MIG stand for?
A. Metal Internal Gas
B. Mechanical Inert Gas
C. Metal Inert Gas
D. Molten Iron Gas
MIG welding uses an inert gas to protect the weld pool.
,4. Which gas is commonly used in TIG welding?
A. Oxygen
B. Nitrogen
C. Argon
D. Carbon dioxide
Argon is an inert gas that protects the weld from contamination.
5. What type of current is commonly used in SMAW?
A. AC only
B. DC only
C. AC or DC
D. Pulsed current only
SMAW can operate using either AC or DC depending on electrode
type.
6. What is slag in welding?
A. Melted base metal
B. Non-metallic residue from flux
C. Excess electrode material
D. Cooling compound
Slag forms from flux and must be removed after welding.
7. What is the purpose of a welding helmet?
A. Improve visibility
B. Reduce noise
C. Protect eyes and face from arc radiation
D. Increase precision
The helmet shields against UV/IR radiation and sparks.
8. What defect is caused by trapped gas in a weld?
A. Cracking
, B. Undercut
C. Porosity
D. Spatter
Porosity appears as small holes due to gas entrapment.
9. Which process produces the cleanest weld?
A. SMAW
B. FCAW
C. TIG
D. Oxy-acetylene
TIG welding produces high-quality, clean welds with minimal
spatter.
10. What is the melting point of steel approximately?
A. 500°C
B. 1000°C
C. 1370–1500°C
D. 2000°C
Steel melts within this temperature range depending on
composition.
11. What is a fillet weld?
A. Weld on flat surface
B. Weld joining two surfaces at right angles
C. Edge weld
D. Groove weld
Fillet welds are triangular and used in T-joints.
12. What causes undercut in welding?
A. Low voltage
B. Slow travel speed
