GMAW Test Questions And Answers
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1. Using 100% CO2 for short circuiting GMAW is an inexpensive choice for a
shielding gas.
Answer: True
Explanation:
100% CO2 is a common and economical shielding gas used in GMAW (Gas Metal Arc
Welding) for short circuiting transfer. It is cheaper than argon-based mixtures but can produce
more spatter and a slightly rougher weld surface.
2. Advantages of the GMAW process include all of the following EXCEPT:
Answer: Outdoor welding
Explanation:
GMAW is generally sensitive to wind and drafts, which makes it less ideal for outdoor welding
without proper wind protection. It excels in indoor or sheltered environments.
3. Using 100% CO2 is going to result in a low penetrating weld.
Answer: False
Explanation:
100% CO2 actually provides deep penetration due to its higher ionization potential. The weld
tends to be more penetrating compared to argon mixes.
4. A characteristic of a 75/25 mix of argon and carbon dioxide is less spatter.
Answer: True
Explanation:
, Argon mixes (like 75% Argon / 25% CO2) reduce spatter, produce smoother arcs, and result in
better weld bead appearance compared to 100% CO2.
5. Limitations to the GMAW process include all of the following except:
Answer: Little slag
Explanation:
GMAW produces little to no slag compared to stick welding or flux-cored welding, which means
slag is not a limitation. Other limitations include sensitivity to wind, equipment complexity, and
need for clean surfaces.
6. Which of the following is NOT a common element found in GMAW wire?
Answer: Iron
Explanation:
GMAW wires are typically made of steel, which contains iron, but the wires themselves are
alloys primarily containing elements like manganese, silicon, and small amounts of other metals.
“Iron” as a pure element is not commonly listed as an alloying element in wire specs.
7. In the AWS electrode classification for GMAW, the two digit number refers to
what?
Answer: Tensile strength
Explanation:
The last two digits in the AWS electrode classification indicate the minimum tensile strength of
the deposited weld metal, in thousands of psi (e.g., E70XX means 70,000 psi tensile strength).
8. What gas or gases should be used for short circuiting?
Answer: 75% Ar / 25% CO2
Explanation:
This argon-rich mix helps maintain a stable arc with minimal spatter during short circuiting
transfer, providing a smoother weld.
9. The best choice for a shielding gas for globular GMAW is:
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1. Using 100% CO2 for short circuiting GMAW is an inexpensive choice for a
shielding gas.
Answer: True
Explanation:
100% CO2 is a common and economical shielding gas used in GMAW (Gas Metal Arc
Welding) for short circuiting transfer. It is cheaper than argon-based mixtures but can produce
more spatter and a slightly rougher weld surface.
2. Advantages of the GMAW process include all of the following EXCEPT:
Answer: Outdoor welding
Explanation:
GMAW is generally sensitive to wind and drafts, which makes it less ideal for outdoor welding
without proper wind protection. It excels in indoor or sheltered environments.
3. Using 100% CO2 is going to result in a low penetrating weld.
Answer: False
Explanation:
100% CO2 actually provides deep penetration due to its higher ionization potential. The weld
tends to be more penetrating compared to argon mixes.
4. A characteristic of a 75/25 mix of argon and carbon dioxide is less spatter.
Answer: True
Explanation:
, Argon mixes (like 75% Argon / 25% CO2) reduce spatter, produce smoother arcs, and result in
better weld bead appearance compared to 100% CO2.
5. Limitations to the GMAW process include all of the following except:
Answer: Little slag
Explanation:
GMAW produces little to no slag compared to stick welding or flux-cored welding, which means
slag is not a limitation. Other limitations include sensitivity to wind, equipment complexity, and
need for clean surfaces.
6. Which of the following is NOT a common element found in GMAW wire?
Answer: Iron
Explanation:
GMAW wires are typically made of steel, which contains iron, but the wires themselves are
alloys primarily containing elements like manganese, silicon, and small amounts of other metals.
“Iron” as a pure element is not commonly listed as an alloying element in wire specs.
7. In the AWS electrode classification for GMAW, the two digit number refers to
what?
Answer: Tensile strength
Explanation:
The last two digits in the AWS electrode classification indicate the minimum tensile strength of
the deposited weld metal, in thousands of psi (e.g., E70XX means 70,000 psi tensile strength).
8. What gas or gases should be used for short circuiting?
Answer: 75% Ar / 25% CO2
Explanation:
This argon-rich mix helps maintain a stable arc with minimal spatter during short circuiting
transfer, providing a smoother weld.
9. The best choice for a shielding gas for globular GMAW is:
