AZ L-78 Industrial Welding
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1. Which welding process uses a continuously fed consumable wire
electrode and shielding gas?
a. SMAW
b. GMAW
c. GTAW
d. SAW
Rationale: GMAW uses a wire-fed electrode and shielding gas for
continuous arc welding.
2. SMAW electrodes are coated primarily to:
a. Add electrical resistance
b. Reduce arc voltage
c. Provide shielding and stabilize the arc
d. Lower melting temperature
Rationale: Electrode coatings in SMAW protect the weld pool and stabilize
the arc.
3. Which weld position is considered the most difficult for beginners?
,a. Flat
b. Horizontal
c. Overhead
d. Vertical
Rationale: Overhead welding requires control of molten metal against
gravity.
4. The heat-affected zone (HAZ) is:
a. The weld metal deposit
b. Base metal area altered by heat but not melted
c. Shielding portion of the arc
d. Filler metal heat zone
Rationale: The HAZ is altered by heat exposure but remains unmelted.
5. TIG welding uses which type of electrode?
a. Steel
b. Aluminum
c. Tungsten
d. Carbon
Rationale: GTAW uses a non-consumable tungsten electrode.
6. Preheating a metal before welding reduces:
a. Heat input
b. Arc length
c. Risk of cracking
d. Filler consumption
Rationale: Preheating reduces thermal stress and improves weld integrity.
, 7. Which statement is true regarding welding fumes?
a. They are harmless
b. They only occur in MIG welding
c. They may contain hazardous metals and require ventilation
d. They occur only indoors
Rationale: Welding fumes contain harmful particulates requiring control
measures.
8. The purpose of a welding procedure specification (WPS) is to: a.
Price materials
b. Determine labor cost
c. Provide standardized welding parameters
d. Replace welder qualifications
Rationale: A WPS ensures consistent, code-compliant welding practices.
9. Which metal is most prone to hot cracking during welding? a.
Mild steel
b. Stainless steel
c. Aluminum
d. Copper
Rationale: Aluminum’s solidification characteristics increase hot-crack risk.
10. A fillet weld is used to join metal pieces that are:
a. End-to-end
b. At an angle
c. Overlapped only
d. Parallel
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. Which welding process uses a continuously fed consumable wire
electrode and shielding gas?
a. SMAW
b. GMAW
c. GTAW
d. SAW
Rationale: GMAW uses a wire-fed electrode and shielding gas for
continuous arc welding.
2. SMAW electrodes are coated primarily to:
a. Add electrical resistance
b. Reduce arc voltage
c. Provide shielding and stabilize the arc
d. Lower melting temperature
Rationale: Electrode coatings in SMAW protect the weld pool and stabilize
the arc.
3. Which weld position is considered the most difficult for beginners?
,a. Flat
b. Horizontal
c. Overhead
d. Vertical
Rationale: Overhead welding requires control of molten metal against
gravity.
4. The heat-affected zone (HAZ) is:
a. The weld metal deposit
b. Base metal area altered by heat but not melted
c. Shielding portion of the arc
d. Filler metal heat zone
Rationale: The HAZ is altered by heat exposure but remains unmelted.
5. TIG welding uses which type of electrode?
a. Steel
b. Aluminum
c. Tungsten
d. Carbon
Rationale: GTAW uses a non-consumable tungsten electrode.
6. Preheating a metal before welding reduces:
a. Heat input
b. Arc length
c. Risk of cracking
d. Filler consumption
Rationale: Preheating reduces thermal stress and improves weld integrity.
, 7. Which statement is true regarding welding fumes?
a. They are harmless
b. They only occur in MIG welding
c. They may contain hazardous metals and require ventilation
d. They occur only indoors
Rationale: Welding fumes contain harmful particulates requiring control
measures.
8. The purpose of a welding procedure specification (WPS) is to: a.
Price materials
b. Determine labor cost
c. Provide standardized welding parameters
d. Replace welder qualifications
Rationale: A WPS ensures consistent, code-compliant welding practices.
9. Which metal is most prone to hot cracking during welding? a.
Mild steel
b. Stainless steel
c. Aluminum
d. Copper
Rationale: Aluminum’s solidification characteristics increase hot-crack risk.
10. A fillet weld is used to join metal pieces that are:
a. End-to-end
b. At an angle
c. Overlapped only
d. Parallel
