Certified Welder Certification Exam

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

• Which welding process uses an electric arc between a consumable

electrode and the workpiece to join metals?

• Oxy-acetylene welding
• TIG welding
• Shielded Metal Arc Welding (SMAW)
• Plasma cutting

Rationale: SMAW, also called stick welding, uses a consumable

electrode to create an electric arc that melts and joins metals.

• In TIG welding, which gas is commonly used as a shielding gas for non-

ferrous metals?

• Carbon dioxide
• Argon 1 / 4

• Oxygen
• Helium

Rationale: Argon is used in TIG welding to shield the weld area from

atmospheric contamination, especially for aluminum and other non- ferrous metals.

• What is the primary purpose of flux in welding?
• To cool the weld
• To prevent oxidation and contamination
• To increase current
• To change the metal’s color

Rationale: Flux protects the molten weld pool from atmospheric

gases, preventing oxidation and ensuring proper fusion.

• Which welding defect appears as a concave depression along the weld

bead?

• Porosity
• Undercut
• Slag inclusion
• Crater crack

Rationale: Undercut is a groove melted into the base metal adjacent

to the weld, reducing strength.

• What is the primary advantage of MIG welding over SMAW?
• Requires less training
• Higher deposition rate and faster welding 2 / 4

• No need for shielding gas
• Works on all metals without preparation

Rationale: MIG welding allows continuous wire feed, producing

welds faster and with less interruption than SMAW.

• In welding symbols, what does a triangle pointing to the reference line

indicate?

• Weld all around
• Fillet weld on the arrow side
• Fillet weld
• Groove weld

Rationale: A triangular symbol indicates a fillet weld, which is a

common weld type used to join perpendicular surfaces.

• Which of the following metals is considered difficult to weld due to

high thermal conductivity?

• Stainless steel
• Mild steel
• Aluminum
• Cast iron

Rationale: Aluminum’s high thermal conductivity and oxide layer

make it challenging to weld without proper technique and shielding.

• What is the main reason preheating steel before welding is sometimes

necessary?

• To clean the metal surface 3 / 4

• To increase electrode life
• To reduce the risk of cracking
• To speed up cooling

Rationale: Preheating lowers the temperature gradient, reducing the

risk of hardening and cracking in the heat-affected zone.

• In SMAW, what type of current is generally preferred for welding thin

metals?

• DC Electrode Positive
• DC Electrode Negative
• AC only
• High-frequency AC

Rationale: DC Electrode Negative (straight polarity) provides deeper

penetration with less heat input on thin metals.

• Which welding joint type is formed when two pieces of metal

are placed edge-to-edge?

• Lap joint
• T-joint
• Corner joint
• Butt joint

Rationale: A butt joint occurs when two pieces of metal are aligned

in the same plane and welded along the edges.

• What does the term “weld penetration” refer to?
• Depth of the electrode
• / 4