QUESTIONS WITH CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |INSTANT
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1. Which welding process uses a non-consumable tungsten
electrode?
A. GMAW
B. SMAW
C. GTAW
D. FCAW
Correct: C. GTAW — GTAW uses a non-consumable
tungsten electrode.
2. In SMAW, the “flux coating” primarily functions to:
A. Increase welding speed
B. Form slag and shield the arc
C. Cool the weld pool
D. Deposit filler metal only
Correct: B. Form slag and shield the arc — The flux shields
the molten metal from atmosphere.
3. Which gas is most commonly used for welding aluminum
in GMAW?
A. Oxygen
B. Carbon dioxide
C. Argon
, D. Helium
Correct: C. Argon — Argon provides good arc stability for
aluminum.
4. FCAW typically uses:
A. External shielding gas only
B. Self-shielding or gas shielding options
C. No flux
D. Solid electrodes only
Correct: B. Self-shielding or gas shielding options — FCAW
electrodes have flux, may also use gas.
5. A characteristic of SAW is:
A. High visibility arc
B. Flux covers the arc
C. Electrode is bare wire
D. No flux required
Correct: B. Flux covers the arc — SAW uses granular flux to
cover the arc.
6. Which filler metal grouping indicates mild steel
electrodes?
A. E7018
B. E316L
C. ER70S-6
D. E4043
Correct: A. E7018 — “70” tensile and low hydrogen
electrode.
, 7. Electrode classification “ER” refers to:
A. Electrode for brazing
B. Electrode for resistance welding
C. “Electrode Rod” for GMAW/GTAW
D. Welding rod not used for arc welding
Correct: C. “Electrode Rod” for GMAW/GTAW — ER
designates filler for gas processes.
8. Which process is best for out-of-position welding?
A. SAW
B. GTAW
C. SMAW
D. OAW
Correct: C. SMAW — SMAW is versatile for all positions.
9. Back purging in GTAW is used to:
A. Speed cooling
B. Clean the surface
C. Protect the weld root from oxidation
D. Add more filler
Correct: C. Protect the weld root from oxidation —
Important for stainless.
10. Which electrode coating type stabilizes the arc and
reduces spatter?
A. Iron oxide
B. Cellulose
C. Rutile
D. Low hydrogen