CWI Fundamentals Tech 3 — Questions and Answers
Question 1: Which destructive test is used to evaluate the ductility of a weld by bending the sample around a specified radius?
- Charpy impact test
- Guided bend test (Correct answer)
- Tensile test
- Nick-break test
Correct answer: Guided bend test
The guided bend test evaluates weld ductility and soundness by bending specimens to a prescribed radius on a jig.
Question 2: Interpass temperature refers to the maximum temperature of the weld area measured just before:
- Post-weld heat treatment
- Each subsequent pass is started (Correct answer)
- The root pass is deposited
- Final inspection
Correct answer: Each subsequent pass is started
Interpass temperature is the maximum allowed temperature of the base metal in the weld zone immediately before depositing each subsequent weld pass.
Question 3: In FCAW, what does a 'T-1' designation in the electrode classification indicate?
- Single-pass only electrode
- Rutile (titania) slag system, all-position capable (Correct answer)
- Tubular electrode for DC straight polarity
- High tensile strength deposit
Correct answer: Rutile (titania) slag system, all-position capable
The T-1 designation indicates a titania-slag flux-cored electrode designed for flat/horizontal, with some being all-position capable.
Question 4: What is the minimum preheat temperature typically required for ASTM A514 steel (quenched and tempered) with thickness over 2.5 inches?
- 50°F (10°C)
- 150°F (65°C) (Correct answer)
- 200°F (93°C)
- 400°F (204°C)
Correct answer: 150°F (65°C)
AWS D1.1 requires a minimum preheat of 150°F for A514 steel over 2.5 inches thick to reduce hydrogen cracking risk.
Question 5: A weld that exhibits 'burn-through' is caused by which condition?
- Insufficient heat input
- Excessive heat input or arc on thin base metal (Correct answer)
- Incorrect shielding gas mixture
- Dirty base metal surface
Correct answer: Excessive heat input or arc on thin base metal
Burn-through occurs when excessive heat melts completely through the base metal, creating a hole in the weld.
Question 6: Which AWS document governs structural welding of steel?
- AWS D1.2
- AWS D1.1 (Correct answer)
- AWS B2.1
- AWS A5.1
Correct answer: AWS D1.1
AWS D1.1 is the Structural Welding Code—Steel, the primary document governing structural steel welding.
Question 7: When a WPS requires PWHT, what parameter must be documented and controlled?
- Travel speed only
- Both temperature and holding time (Correct answer)
- Electrode diameter only
- Shielding gas flow rate
Correct answer: Both temperature and holding time
PWHT requires controlling and documenting both the temperature and the minimum holding time to achieve the required stress relief.
CWI Fundamentals Tech 3
Which destructive test is used to evaluate the ductility of a weld by bending the sample around a specified radius?