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Key Facts: GTAW NC II Exam

₱2,126

Assessment Fee

TESDA Circular 072-2021

TIG/GTAW

Process

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 review concepts for the GTAW NC II exam. 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 Exam

National TIG welding certification practice covering tungsten electrodes, filler metals, gas shielding/purging concepts, and weld defects.

Exam sponsor: TESDA. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Performance-based assessment

Time Limit

4 to 8 hours

Passing Score

Competency-based

Exam / Certification Fees

₱2,126.00

Exam sponsor website

Reported exam pass rate: Varies. by assessment center Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

GTAW Process & Tungsten/Filler

Tungsten electrodes, filler metals, polarity, and torch setup

35%

Plate & Pipe Welding Technique

Weld carbon steel plates and pipes using GTAW

25%

Gas Purging & Quality

Shielding/purging concepts, contamination control, and defects

15%

Safety & Common Skills

Welding safety, drawings/symbols, and fit-up

Preparing for the GTAW NC II Exam

What You Need to Know

Passing score: Competency-based
Assessment: Performance-based assessment
Time limit: 4 to 8 hours
Exam / certification fees: ₱2,126.00 Official sources

Using Our Practice Resources

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GTAW NC II: Suggested Study Strategy

1Know DCEN vs DCEP roles for GTAW on carbon steel conceptually.

2Review tungsten contamination causes and proper grinding practices.

3Understand argon shielding and why drafts destroy weld quality.

4Study oxidation/coloration cues on stainless vs carbon steel carefully—stay within carbon steel NC scope.

5Prepare for oral questions on why root pass quality matters on pipe.

Frequently Asked Questions

What does GTAW NC II qualify?

Welding carbon steel plates and pipes using gas tungsten arc welding (TIG), with code conformity references consistent with TESDA welding TRs.

Assessment fee?

Promulgated TESDA assessment fee ₱2,126.00 for Gas Tungsten Arc Welding (GTAW) NC II Full (TESDA Circular No. 072-2021, 6 Sep 2021).

Assessment methods?

Written knowledge plus observation/demonstration with oral questioning and practical welds.

Passing standard?

Competent / Not Yet Competent.

Why is GTAW used?

It provides precise heat control and high-quality welds, especially for root passes and thin materials—knowledge tested alongside practical skill.

Free Practice Questions for GTAW NC II

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