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TESDA Gas Metal Arc Welding (GMAW) NC II Competency Assessment practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: GMAW NC II Exam
₱3,361
Assessment Fee
TESDA Circular 072-2021
MIG/GMAW
Process
TR
Competency
Passing Standard
TESDA
5 years
NC Validity
TESDA
TESDA GMAW NC II certifies MIG welders for carbon steel pipe work. Assessment is competency-based with written and practical parts. Fee ₱2,925 (Jan 2021 schedule).
Sample GMAW NC II Practice Questions
Try these sample questions to test your GMAW NC II exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1What does GMAW stand for in TESDA welding qualifications?
A.Gas Metal Arc Welding
B.Gas Manual Arc Welding
C.General Metal Alloy Welding
D.Grounded Metal Arc Welding
Explanation: GMAW is Gas Metal Arc Welding, commonly called MIG welding. A continuously fed solid wire electrode melts in an arc shielded by external gas.
2In carbon steel pipe GMAW, which shielding gas mixture is most commonly specified for balanced arc stability and penetration?
A.75% argon / 25% CO₂ (C-25)
B.100% oxygen
C.100% acetylene
D.50% nitrogen / 50% helium
Explanation: A 75/25 argon-CO₂ blend (C-25) is widely used on carbon steel because argon stabilizes the arc while CO₂ increases penetration and wetting.
3What is the primary purpose of shielding gas in GMAW pipe welding?
A.Protect the molten weld pool and arc from atmospheric oxygen and nitrogen
B.Cool the weld bead rapidly to increase hardness
C.Replace the need for a filler wire electrode
D.Generate slag that floats on top of the weld
Explanation: Shielding gas displaces air around the arc and pool, preventing oxidation, porosity, and nitrogen absorption in the weld metal.
4ER70S-6 is a common solid wire for carbon steel GMAW. What does the "70" indicate?
A.Minimum tensile strength of the deposited weld metal of 70,000 psi
B.The wire diameter is 0.070 inches
C.The wire contains 70% copper
D.The wire must be used at 70 amperes minimum
Explanation: In AWS filler classifications, the first two digits after ER give minimum tensile strength in thousands of psi; 70 means 70 ksi (about 480 MPa).
5Which GMAW metal transfer mode uses low current and voltage so the wire repeatedly short-circuits into the weld pool?
A.Short-circuiting (dip) transfer
B.Spray transfer
C.Globular transfer
D.Submerged arc transfer
Explanation: Short-circuiting transfer occurs at low heat input; the wire touches the pool, arcs, and repeats—ideal for thin pipe and out-of-position work.
6Spray transfer in GMAW is generally preferred for thick carbon steel pipe in which position?
A.Flat or horizontal (e.g., 1G/2G) where gravity assists the pool
B.Overhead only (4G) on thin sheet
C.Vertical down on open-root pipe without backing
D.Any position because spray has the lowest heat input
Explanation: Spray transfer needs higher current and voltage, producing high heat and fluid pools best controlled in flat or horizontal pipe positions like 2G.
7Globular transfer in GMAW is generally avoided for quality pipe welds because it tends to produce:
A.Large irregular droplets, high spatter, and poor bead control
B.The deepest penetration with the least spatter
C.A perfectly smooth bead with no fusion issues
D.Zero heat input suitable for thin wall pipe
Explanation: Globular mode sits between short-circuit and spray; droplets are large and erratic, causing spatter and inconsistent fusion unsuitable for coded pipe work.
8Pulsed GMAW (GMAW-P) is advantageous for carbon steel pipe because it:
A.Alternates high-energy spray pulses with a lower background current to control heat in position welds
B.Eliminates the need for any shielding gas
C.Uses a flux-cored wire only
D.Operates without a welding power source
Explanation: Pulsed transfer combines spray-like deposition with reduced average heat, helping control the pool in 5G/6G pipe without excessive distortion.
9Pure CO₂ as a GMAW shielding gas on carbon steel typically produces:
A.Deeper penetration and higher spatter than argon-rich mixes
B.A completely inert arc with no oxidation
C.The softest arc ideal for thin sheet only
D.No need to adjust voltage or wire feed speed
Explanation: CO₂ is an active gas that increases arc energy and penetration but creates more spatter and a harsher arc than argon blends.
10The "S" in ER70S-6 indicates the filler is:
A.A solid wire electrode
B.A self-shielded flux-cored wire
C.A submerged-arc granular flux
D.A stick (SMAW) coated electrode
Explanation: In AWS designations, S means solid wire; 6 denotes higher silicon and manganese deoxidizers suited to rusty or mill-scale carbon steel.
About the GMAW NC II Practice Questions
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