Manitoba Welder Certification Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What welding process uses a continuously fed consumable wire
electrode and shielding gas?
A. SMAW
B. GTAW
C. GMAW
D. FCAW
Answer: C
GMAW (MIG welding) uses a continuously fed wire electrode and
external shielding gas.
2. Which electrode classification is commonly used for structural
steel welding?
A. E6010
B. E7018
C. E308L
D. E7024
Answer: B
E7018 provides low hydrogen welds with good strength for structural
applications.
, 3. What is the primary purpose of preheating carbon steel before
welding?
A. Increase weld speed
B. Reduce electrode consumption
C. Prevent cracking
D. Improve appearance
Answer: C
Preheating reduces cooling rate and minimizes hydrogen-induced
cracking.
4. Which gas is commonly used as shielding gas in GTAW?
A. CO₂
B. Oxygen
C. Nitrogen
D. Argon
Answer: D
Argon provides stable arc characteristics and good weld quality in
GTAW.
5. What defect is caused by trapped gas in the weld metal?
A. Undercut
B. Slag inclusion
C. Porosity
D. Overlap
Answer: C
Porosity occurs when gas becomes trapped during solidification.
6. Which position is the most difficult for groove welds?
A. Flat
, B. Horizontal
C. Vertical
D. Overhead
Answer: D
Overhead welding is difficult due to gravity affecting molten metal.
7. What does the “70” in E7018 electrode classification represent?
A. Electrode diameter
B. Tensile strength (70,000 psi)
C. Polarity
D. Flux type
Answer: B
The first two digits indicate minimum tensile strength.
8. Which welding process is best suited for thin stainless steel?
A. SMAW
B. FCAW
C. GTAW
D. SAW
Answer: C
GTAW offers precise heat control, ideal for thin materials.
9. What is the function of flux in SMAW electrodes?
A. Increase amperage
B. Provide shielding and remove impurities
C. Cool the weld
D. Strengthen base metal
Answer: B
Flux forms slag and shielding gas to protect the molten weld.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What welding process uses a continuously fed consumable wire
electrode and shielding gas?
A. SMAW
B. GTAW
C. GMAW
D. FCAW
Answer: C
GMAW (MIG welding) uses a continuously fed wire electrode and
external shielding gas.
2. Which electrode classification is commonly used for structural
steel welding?
A. E6010
B. E7018
C. E308L
D. E7024
Answer: B
E7018 provides low hydrogen welds with good strength for structural
applications.
, 3. What is the primary purpose of preheating carbon steel before
welding?
A. Increase weld speed
B. Reduce electrode consumption
C. Prevent cracking
D. Improve appearance
Answer: C
Preheating reduces cooling rate and minimizes hydrogen-induced
cracking.
4. Which gas is commonly used as shielding gas in GTAW?
A. CO₂
B. Oxygen
C. Nitrogen
D. Argon
Answer: D
Argon provides stable arc characteristics and good weld quality in
GTAW.
5. What defect is caused by trapped gas in the weld metal?
A. Undercut
B. Slag inclusion
C. Porosity
D. Overlap
Answer: C
Porosity occurs when gas becomes trapped during solidification.
6. Which position is the most difficult for groove welds?
A. Flat
, B. Horizontal
C. Vertical
D. Overhead
Answer: D
Overhead welding is difficult due to gravity affecting molten metal.
7. What does the “70” in E7018 electrode classification represent?
A. Electrode diameter
B. Tensile strength (70,000 psi)
C. Polarity
D. Flux type
Answer: B
The first two digits indicate minimum tensile strength.
8. Which welding process is best suited for thin stainless steel?
A. SMAW
B. FCAW
C. GTAW
D. SAW
Answer: C
GTAW offers precise heat control, ideal for thin materials.
9. What is the function of flux in SMAW electrodes?
A. Increase amperage
B. Provide shielding and remove impurities
C. Cool the weld
D. Strengthen base metal
Answer: B
Flux forms slag and shielding gas to protect the molten weld.
