Practice Exam Questions And Correct

Ohio Metal Fabrication Technician Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• Which personal protective equipment (PPE) is required when welding?
• Safety glasses only
• Gloves only
• Welding helmet, gloves, and protective clothing
• Earplugs only

Answer: Welding helmet, gloves, and protective clothing

Rationale: Welding produces UV light, sparks, and heat. Proper PPE

prevents burns, eye damage, and exposure to harmful radiation.

• What is the most common gas used in MIG welding for mild steel?
• Oxygen 1 / 4

• Argon/CO₂ mixture
• Helium
• Nitrogen

Answer: Argon/CO₂ mixture

Rationale: A mixture of argon and CO₂ is commonly used in MIG welding

mild steel to provide a stable arc and good weld quality.

• Which type of steel is most prone to corrosion?
• Stainless steel
• Carbon steel
• Tool steel
• Alloy steel

Answer: Carbon steel

Rationale: Carbon steel lacks corrosion-resistant elements like chromium

and rusts easily when exposed to moisture.

• What does “annealing” a metal do?
• Hardens the metal
• Softens the metal
• Adds corrosion resistance
• Coats the metal

Answer: Softens the metal

Rationale: Annealing heats metal to a specific temperature and cools it

slowly to relieve internal stresses and soften it. 2 / 4

• When measuring with a caliper, what is the most accurate way to read

the measurement?

• Estimate between marks
• Use the ruler on the caliper only
• Read the digital or vernier scale
• Round up to the nearest millimeter

Answer: Read the digital or vernier scale

Rationale: Digital or vernier calipers provide precise measurements down

to thousandths of an inch or hundredths of a millimeter.

• What is the primary purpose of a grinder in metal fabrication?
• Cut wood
• Weld metals
• Smooth or shape metal surfaces
• Drill holes

Answer: Smooth or shape metal surfaces

Rationale: Grinders are used to remove burrs, smooth edges, and shape

metal components.

• What is the function of a spot weld?
• Join two metal pieces at a localized point
• Cut metal sheets
• Harden metal
• Measure thickness 3 / 4

Answer: Join two metal pieces at a localized point

Rationale: Spot welding joins metals at small, concentrated areas without

affecting the rest of the material.

• Which tool is best for measuring inside diameters of pipes?
• Tape measure
• Ruler
• Inside caliper
• Micrometer

Answer: Inside caliper

Rationale: Inside calipers are specifically designed to measure internal

diameters of round objects like pipes.

• When using an oxy-acetylene torch, what is the correct order to open

valves?

• Acetylene first, then oxygen
• Oxygen first, then acetylene
• Oxygen first, then acetylene; shut off acetylene first, then oxygen
• Any order is acceptable

Answer: Oxygen first, then acetylene; shut off acetylene first, then oxygen

Rationale: This sequence ensures safety, prevents flashbacks, and

maintains proper torch operation.

• Which type of welding produces minimal spatter and requires no

filler material for thin sheets?

• / 4