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TESDA Gas Tungsten Arc Welding (GTAW) NC II Competency Assessment practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: GTAW NC II Exam
₱2,126
Assessment Fee
TESDA Circular 072-2021
TIG/GTAW
Process
TR
Competency
Passing Standard
TESDA
5 years
NC Validity
TESDA
TESDA GTAW NC II certifies TIG welders for carbon steel plate and pipe. Assessment includes written and practical components. Fee ₱1,760 (Jan 2021).
Sample GTAW NC II Practice Questions
Try these sample questions to test your GTAW 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 GTAW stand for in TESDA welding qualifications?
A.Gas Tungsten Arc Welding
B.Gas Transfer Arc Welding
C.General Tungsten Application Welding
D.Grounded Tungsten Arc Welding
Explanation: GTAW is Gas Tungsten Arc Welding, commonly called TIG welding. TESDA GTAW NC II certifies competency to weld carbon steel plates and pipes using this process per the official Training Regulations.
2Which shielding gas is specified in the TESDA GTAW NC II Training Regulations for GTAW on carbon steel?
A.Argon or other available inert gas
B.100% carbon dioxide
C.Acetylene
D.Propane
Explanation: The TESDA GTAW NC II range of variables lists argon or other available inert gas as the shielding gas for GTAW. Argon provides stable arc characteristics and effective protection of the weld pool on carbon steel.
3For GTAW on carbon steel, which polarity typically places the majority of heat on the workpiece?
A.Direct Current Electrode Negative (DCEN)
B.Direct Current Electrode Positive (DCEP)
C.Alternating Current (AC) only
D.No polarity — GTAW uses only AC
Explanation: DCEN concentrates about two-thirds of the arc heat on the workpiece, giving deeper penetration and is the standard polarity for GTAW on carbon and low-alloy steels.
4A GTAW welder notices the tungsten tip is balled from previous DCEP use. What is the correct action before DCEN welding on carbon steel?
A.Regrind the tungsten to a pointed tip along its length on a dedicated grinder
B.Leave the ball tip because it improves arc stability on carbon steel
C.Break off the tip by tapping it on the bench
D.Switch to AC to use the existing ball tip
Explanation: For DCEN GTAW on carbon steel, a sharp or slightly tapered point gives a focused arc. A balled tip from DCEP use must be reground on a clean, dedicated wheel to avoid contamination.
5Which tungsten preparation practice prevents weld contamination?
A.Grind tungsten only on a dedicated wheel along the electrode length while wearing proper PPE
B.Grind tungsten on the same wheel used for carbon steel preparation
C.Grind tungsten perpendicular to its length for a faster point
D.Grind without eye protection to save time
Explanation: TESDA and industry practice require grinding tungsten on a dedicated stone along the electrode axis to avoid contaminants that cause tungsten inclusions and porosity.
6What is the function of a gas lens in a GTAW torch?
A.It straightens shielding gas flow for better coverage and longer electrode stick-out
B.It increases welding current capacity of the torch
C.It converts AC output to DCEN automatically
D.It preheats the filler rod before insertion
Explanation: A gas lens uses layered screens to produce smooth, columnar gas flow, improving shielding around the tungsten and allowing longer stick-out when access is limited.
7Which filler metal is commonly used with GTAW on carbon steel per TESDA welding training?
A.ER70S-2 or ER70S-6 bare rod suitable for the base metal
B.E6013 covered electrode
C.E7018 low-hydrogen stick electrode only
D.Self-shielded flux-cored wire
Explanation: GTAW uses bare filler rod such as ER70S-2 or ER70S-6 for carbon steel, selected to match base metal strength and the approved WPS.
8When setting GTAW amperage for a given tungsten diameter, what is the general rule?
A.Use the recommended amp range for the tungsten size to avoid melting or overheating the electrode
B.Always use maximum machine amperage regardless of tungsten size
C.Select amperage based only on filler rod diameter
D.Higher amperage always requires only a larger gas cup, not larger tungsten
Explanation: Each tungsten diameter has a practical current range; exceeding it causes melting, contamination, and unstable arc per WPS and manufacturer charts.
9What happens if shielding gas flow is set far too high on GTAW?
A.Turbulent gas flow can pull air into the weld zone and cause porosity
B.Penetration automatically doubles with no side effects
C.The tungsten will never contaminate regardless of flow
D.Filler metal deposition rate increases proportionally
Explanation: Excessive flow creates turbulence that entrains atmospheric nitrogen and oxygen, causing porosity despite using inert gas.
10Which component establishes and maintains the arc in GTAW?
A.The welding power source and torch lead circuit
B.The filler rod only
C.The gas cylinder regulator alone
D.The chipping hammer
Explanation: The power source supplies current for the arc; the torch delivers it through the tungsten while shielding gas protects the molten pool.
About the GTAW NC II Practice Questions
Verified exam format metadata for TESDA Gas Tungsten Arc Welding (GTAW) NC II Competency Assessment is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.