AZ L-25 Welding Contractor Exam —
Practice Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2027 Q&A | Instant
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1. What is the primary purpose of shielding gas in a gas-shielded welding
process?
A. To increase the electrical resistance of the electrode
B. To cool the weld metal immediately
C. To protect the molten weld pool from atmospheric contamination
D. To increase the hardness of the base metal
Answer: C. To protect the molten weld pool from atmospheric
contamination
Rationale: Shielding gas prevents oxygen, nitrogen, and other atmospheric
contaminants from reacting with the molten weld pool and causing defects
such as porosity and embrittlement.
,2. Which welding process uses a continuously fed consumable wire
electrode?
A. SMAW
B. GTAW
C. GMAW
D. Oxyfuel welding
Answer: C. GMAW
Rationale: Gas Metal Arc Welding (GMAW) uses a continuously fed wire
electrode and shielding gas.
3. What does SMAW stand for?
A. Shielded Metal Arc Welding
B. Standard Mechanical Arc Welding
C. Shielded Machine Aluminum Welding
D. Submerged Metal Arc Welding
Answer: A. Shielded Metal Arc Welding
Rationale: SMAW is Shielded Metal Arc Welding, commonly called stick
welding.
4. Which process commonly uses a nonconsumable tungsten electrode?
,A. SMAW
B. GTAW
C. FCAW
D. GMAW
Answer: B. GTAW
Rationale: Gas Tungsten Arc Welding (GTAW), commonly known as TIG
welding, uses a nonconsumable tungsten electrode.
5. What is the main function of the electrode in SMAW?
A. Only to provide shielding gas
B. To supply cooling water
C. To conduct current and provide filler metal
D. To remove slag from the joint
Answer: C. To conduct current and provide filler metal
Rationale: The consumable SMAW electrode carries the welding current
and melts to provide filler metal while its coating generates shielding
gases and slag.
6. What welding defect is characterized by gas pockets trapped in
solidified weld metal?
, A. Undercut
B. Porosity
C. Overlap
D. Crater
Answer: B. Porosity
Rationale: Porosity consists of cavities formed when gases become trapped
in the weld metal during solidification.
7. What is undercut?
A. A groove melted into the base metal adjacent to the weld toe or root
B. Excessive penetration through the joint
C. A crack inside the electrode
D. A gap between two welding machines
Answer: A. A groove melted into the base metal adjacent to the weld toe
or root
Rationale: Undercut reduces the effective cross section of the base metal
and can become a stress-concentration point.
8. Which welding position is generally designated as the flat position?
A. 1G
B. 2G
Practice Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary purpose of shielding gas in a gas-shielded welding
process?
A. To increase the electrical resistance of the electrode
B. To cool the weld metal immediately
C. To protect the molten weld pool from atmospheric contamination
D. To increase the hardness of the base metal
Answer: C. To protect the molten weld pool from atmospheric
contamination
Rationale: Shielding gas prevents oxygen, nitrogen, and other atmospheric
contaminants from reacting with the molten weld pool and causing defects
such as porosity and embrittlement.
,2. Which welding process uses a continuously fed consumable wire
electrode?
A. SMAW
B. GTAW
C. GMAW
D. Oxyfuel welding
Answer: C. GMAW
Rationale: Gas Metal Arc Welding (GMAW) uses a continuously fed wire
electrode and shielding gas.
3. What does SMAW stand for?
A. Shielded Metal Arc Welding
B. Standard Mechanical Arc Welding
C. Shielded Machine Aluminum Welding
D. Submerged Metal Arc Welding
Answer: A. Shielded Metal Arc Welding
Rationale: SMAW is Shielded Metal Arc Welding, commonly called stick
welding.
4. Which process commonly uses a nonconsumable tungsten electrode?
,A. SMAW
B. GTAW
C. FCAW
D. GMAW
Answer: B. GTAW
Rationale: Gas Tungsten Arc Welding (GTAW), commonly known as TIG
welding, uses a nonconsumable tungsten electrode.
5. What is the main function of the electrode in SMAW?
A. Only to provide shielding gas
B. To supply cooling water
C. To conduct current and provide filler metal
D. To remove slag from the joint
Answer: C. To conduct current and provide filler metal
Rationale: The consumable SMAW electrode carries the welding current
and melts to provide filler metal while its coating generates shielding
gases and slag.
6. What welding defect is characterized by gas pockets trapped in
solidified weld metal?
, A. Undercut
B. Porosity
C. Overlap
D. Crater
Answer: B. Porosity
Rationale: Porosity consists of cavities formed when gases become trapped
in the weld metal during solidification.
7. What is undercut?
A. A groove melted into the base metal adjacent to the weld toe or root
B. Excessive penetration through the joint
C. A crack inside the electrode
D. A gap between two welding machines
Answer: A. A groove melted into the base metal adjacent to the weld toe
or root
Rationale: Undercut reduces the effective cross section of the base metal
and can become a stress-concentration point.
8. Which welding position is generally designated as the flat position?
A. 1G
B. 2G
