CWI Ultimate Review 3 — Questions and Answers
Question 1: Which AWS document governs the structural welding of steel for buildings and bridges?
- AWS D1.2
- AWS D1.1 (Correct answer)
- AWS D1.6
- AWS B2.1
Correct answer: AWS D1.1
AWS D1.1, the Structural Welding Code—Steel, is the governing document for structural steel welding in buildings and bridges.
Question 2: A Charpy V-notch (CVN) impact test measures a material's:
- Tensile strength
- Hardness
- Toughness (notch toughness) (Correct answer)
- Ductility
Correct answer: Toughness (notch toughness)
The Charpy V-notch test measures the energy absorbed during fracture, which is a measure of the material's toughness or notch toughness.
Question 3: On a welding symbol, a flag attached to the reference line indicates:
- A field weld (Correct answer)
- A weld all around
- A flush weld
- A melt-through weld
Correct answer: A field weld
A flag on the reference line of a welding symbol indicates the weld is to be made in the field (on-site) rather than in the shop.
Question 4: What is 'hydrogen-induced cracking' (HIC) most commonly associated with in welding?
- Austenitic stainless steel welded without filler
- High-strength low-alloy steel welded without adequate preheat (Correct answer)
- Aluminum welded with GTAW
- Copper alloys welded with GMAW
Correct answer: High-strength low-alloy steel welded without adequate preheat
HIC (also called cold cracking or delayed cracking) is most commonly associated with high-strength steels where hydrogen absorbed during welding causes cracking, especially without adequate preheat.
Question 5: In ultrasonic testing (UT), what does the term 'dead zone' refer to?
- The area behind the back wall of the test piece
- The region immediately below the test surface where defects cannot be detected due to the initial pulse (Correct answer)
- An area of high attenuation
- The region outside the beam spread
Correct answer: The region immediately below the test surface where defects cannot be detected due to the initial pulse
The dead zone is the region immediately beneath the transducer face where defects cannot be detected because of the initial transmit pulse interfering with the return signal.
Question 6: Which type of weld joint is formed when two members are joined at an angle between 135° and 180°?
- Tee joint
- Corner joint (Correct answer)
- Butt joint
- Edge joint
Correct answer: Corner joint
A corner joint is formed when two members are joined at an angle between 135° and 180° (approximately a right angle at the corner).
Question 7: When performing a guided bend test, the specimen is considered to have failed if a crack or other open discontinuity exceeds what dimension on the convex surface after bending?
- 1/16 in (1.6 mm)
- 1/8 in (3.2 mm) (Correct answer)
- 3/16 in (4.8 mm)
- 1/4 in (6.4 mm)
Correct answer: 1/8 in (3.2 mm)
Per AWS D1.1, a guided bend test specimen fails if any crack or open discontinuity exceeds 1/8 in (3.2 mm) in any direction on the convex surface.
CWI Ultimate Review 3
Which AWS document governs the structural welding of steel for buildings and bridges?