Metal Fabricator Certification Exam

Metal Fabricator Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which process is primarily used to join two pieces of metal using high

heat and filler material?

• Soldering
• Brazing
• Welding
• Mechanical fastening

Rationale: Welding involves melting base metals and adding a filler

material to form a strong joint, unlike soldering or brazing, which use lower temperatures.

• What is the main purpose of a metal grinder in fabrication?
• Measuring
• Removing excess material or smoothing edges 1 / 4

• Joining metals
• Cutting threads

Rationale: Metal grinders are designed to smooth, shape, or remove

excess metal to prepare for assembly or finishing.

• Which metal has the highest corrosion resistance?
• Steel
• Stainless steel
• Aluminum
• Copper

Rationale: Stainless steel contains chromium, which forms a passive

layer that protects against rust and corrosion.

• What does MIG stand for in welding?
• Manual Inert Gas
• Metal Inert Gas
• Metal Integrated Gas
• Mechanized Inert Gas

Rationale: MIG welding uses a continuously fed wire electrode and

an inert shielding gas to protect the weld pool.

• What is the purpose of annealing metal?
• Hardening
• Coating
• Softening and relieving internal stresses
• Cutting 2 / 4

Rationale: Annealing involves heating metal and cooling it slowly to

reduce hardness and improve ductility.

• Which tool is used to check the flatness of a metal surface?
• Vernier caliper
• Micrometer
• Straight edge
• Angle gauge

Rationale: A straight edge is a precise tool used to inspect flatness

and alignment of surfaces.

• What is a common filler material for aluminum welding?

A. ER70S-6

B. ER4043

C. ER308L

D. ER110S

Rationale: ER4043 is an aluminum-silicon filler rod commonly used in

TIG or MIG welding aluminum alloys.

• Which welding process is most suitable for thin sheet metal?
• Stick welding
• Submerged arc welding
• TIG welding
• Flux-cored arc welding

Rationale: TIG welding allows precise heat control, making it ideal

for thin materials without burn-through. 3 / 4

• What is the typical hardness scale used for steel?
• Brinell
• Rockwell
• Vickers
• All of the above

Rationale: Brinell, Rockwell, and Vickers scales are all commonly

used to measure steel hardness depending on the application.

• What is the main safety concern when welding galvanized steel?
• Fire hazard
• Electric shock
• Toxic fumes (zinc oxide)
• Noise

Rationale: Galvanized steel produces zinc oxide fumes when welded,

which are hazardous if inhaled.

• Which gas is commonly used as a shielding gas in MIG welding

steel?

• Oxygen
• Nitrogen
• Argon-CO₂ mix
• Helium

Rationale: A mixture of argon and CO₂ is standard for MIG welding

mild and carbon steels for stable arc and good penetration.

• / 4