Ohio Welding Certification Exam TIG

Ohio Welding Certification Exam TIG Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What does GTAW stand for?
• Gas Thermal Arc Welding
• Gas Tungsten Arc Welding
• Gas Titanium Arc Welding
• General Tungsten Arc Welding
• Gas Tungsten Arc Welding

Rationale: GTAW is another term for TIG welding, which uses a non-

consumable tungsten electrode.

• Which shielding gas is most commonly used for TIG welding of

stainless steel?

• Oxygen
• Argon 1 / 4

• Helium
• Carbon Dioxide
• Argon

Rationale: Argon provides a stable arc and prevents oxidation of

stainless steel.

• What is the typical polarity for TIG welding aluminum?
• DCEN (Direct Current Electrode Negative)
• DCEP (Direct Current Electrode Positive)
• AC (Alternating Current)
• None of the above
• AC (Alternating Current)

Rationale: AC allows cleaning of the aluminum oxide layer while

providing adequate heat for welding.

• Which tungsten type is recommended for welding steel?
• Pure tungsten (Green)
• Thoriated tungsten (Red)
• Ceriated tungsten (Orange)
• Lanthanated tungsten (Gold)
• Thoriated tungsten (Red)

Rationale: Thoriated tungsten provides excellent arc stability for

steel welding.

• What is the primary purpose of a TIG filler rod?
• Shield the weld 2 / 4

• Conduct electricity
• Provide additional metal to the joint
• Cool the weld pool
• Provide additional metal to the joint

Rationale: The filler rod is manually fed into the weld pool to

strengthen and complete the joint.

• What is the ideal tungsten tip shape for DC welding of steel?
• Ball
• Pointed
• Rounded
• Flat
• Pointed

Rationale: A pointed tungsten provides a concentrated arc suitable

for penetration and precision.

• What is the primary advantage of TIG welding over SMAW?
• Faster welding speed
• Less equipment required
• Cleaner, high-quality welds
• Can weld thick materials without filler
• Cleaner, high-quality welds

Rationale: TIG welding produces precise, clean welds with minimal

spatter. 3 / 4

• Which technique is used to prevent tungsten contamination?
• Dragging the electrode through the puddle
• Touching the tungsten to the workpiece
• Using proper arc length
• Welding without gas
• Using proper arc length

Rationale: Maintaining correct arc length prevents tungsten from

touching the weld pool and contaminating it.

9. For GTAW, the correct torch angle is typically:

• 90 degrees to the workpiece
• 15–20 degrees from vertical, pointing away
• 45 degrees parallel to the joint
• Any comfortable angle
• 15–20 degrees from vertical, pointing away

Rationale: This angle ensures optimal shielding gas coverage and

weld penetration.

• What is the purpose of back purging in TIG welding stainless

steel?

• Reduce heat input
• Improve weld appearance
• Prevent oxidation inside the joint
• Increase filler deposition
• Prevent oxidation inside the joint
• / 4