CWB Level II Questions and Answers |
Latest Version | 2024/2025 | Correct &
Verified
What is the main purpose of welding codes and standards?
✔✔ To ensure welds meet quality, safety, and performance requirements.
What causes slag inclusions in a weld?
✔✔ Improper slag removal between passes or incorrect welding technique.
Why is a root pass important in welding?
✔✔ It ensures complete penetration and provides a solid foundation for subsequent weld passes.
What is the purpose of non-destructive testing (NDT) in welding?
✔✔ To evaluate the weld quality without damaging the weld or base material.
How can incomplete fusion in a weld be prevented?
✔✔ By using proper heat input and technique to ensure adequate bonding between materials.
1
,What is a fillet weld, and where is it commonly used?
✔✔ A weld joining two surfaces at approximately right angles; commonly used in T-joints and
lap joints.
What is the heat-affected zone (HAZ) in welding?
✔✔ The area of base metal that is altered by the heat of welding but not melted.
How is a concave fillet weld different from a convex fillet weld?
✔✔ A concave weld has a hollowed appearance, while a convex weld has a rounded, bulging
surface.
Why is post-weld heat treatment (PWHT) sometimes required?
✔✔ To relieve residual stresses and improve mechanical properties of the weld.
What is weld spatter, and how can it be minimized?
✔✔ Spatter consists of molten metal droplets scattered during welding; it can be minimized by
proper settings and technique.
2
,How can a welding arc be stabilized?
✔✔ By maintaining proper electrode angle, arc length, and welding current.
What is the significance of joint preparation in welding?
✔✔ Proper joint preparation ensures good fit-up, penetration, and weld quality.
What does the term "arc blow" refer to in welding?
✔✔ The deflection of the welding arc due to magnetic forces in the workpiece.
How can a welder avoid excessive distortion in a weld?
✔✔ By using proper welding sequence, heat input control, and clamping methods.
What is a butt joint in welding?
✔✔ A joint where two pieces of metal are joined end to end in the same plane.
What is weld penetration, and why is it important?
✔✔ The depth a weld fuses into the base metal; it is crucial for joint strength.
3
, What causes weld cracking, and how can it be prevented?
✔✔ Rapid cooling, high stress, or improper technique; prevention includes preheating and
controlled cooling.
What is the purpose of tack welding?
✔✔ To temporarily hold parts in place for proper alignment before final welding.
What is weld overlap, and why is it a defect?
✔✔ Excess weld metal rolls over the base metal without fusing, which weakens the weld.
What is a welding transformer, and what does it do?
✔✔ A device that converts high-voltage electricity to low-voltage, high-current electricity for
welding.
What does the term "electrode efficiency" refer to?
✔✔ The ratio of deposited weld metal to the total consumed electrode material.
How can a welder ensure consistent weld bead appearance?
4
Latest Version | 2024/2025 | Correct &
Verified
What is the main purpose of welding codes and standards?
✔✔ To ensure welds meet quality, safety, and performance requirements.
What causes slag inclusions in a weld?
✔✔ Improper slag removal between passes or incorrect welding technique.
Why is a root pass important in welding?
✔✔ It ensures complete penetration and provides a solid foundation for subsequent weld passes.
What is the purpose of non-destructive testing (NDT) in welding?
✔✔ To evaluate the weld quality without damaging the weld or base material.
How can incomplete fusion in a weld be prevented?
✔✔ By using proper heat input and technique to ensure adequate bonding between materials.
1
,What is a fillet weld, and where is it commonly used?
✔✔ A weld joining two surfaces at approximately right angles; commonly used in T-joints and
lap joints.
What is the heat-affected zone (HAZ) in welding?
✔✔ The area of base metal that is altered by the heat of welding but not melted.
How is a concave fillet weld different from a convex fillet weld?
✔✔ A concave weld has a hollowed appearance, while a convex weld has a rounded, bulging
surface.
Why is post-weld heat treatment (PWHT) sometimes required?
✔✔ To relieve residual stresses and improve mechanical properties of the weld.
What is weld spatter, and how can it be minimized?
✔✔ Spatter consists of molten metal droplets scattered during welding; it can be minimized by
proper settings and technique.
2
,How can a welding arc be stabilized?
✔✔ By maintaining proper electrode angle, arc length, and welding current.
What is the significance of joint preparation in welding?
✔✔ Proper joint preparation ensures good fit-up, penetration, and weld quality.
What does the term "arc blow" refer to in welding?
✔✔ The deflection of the welding arc due to magnetic forces in the workpiece.
How can a welder avoid excessive distortion in a weld?
✔✔ By using proper welding sequence, heat input control, and clamping methods.
What is a butt joint in welding?
✔✔ A joint where two pieces of metal are joined end to end in the same plane.
What is weld penetration, and why is it important?
✔✔ The depth a weld fuses into the base metal; it is crucial for joint strength.
3
, What causes weld cracking, and how can it be prevented?
✔✔ Rapid cooling, high stress, or improper technique; prevention includes preheating and
controlled cooling.
What is the purpose of tack welding?
✔✔ To temporarily hold parts in place for proper alignment before final welding.
What is weld overlap, and why is it a defect?
✔✔ Excess weld metal rolls over the base metal without fusing, which weakens the weld.
What is a welding transformer, and what does it do?
✔✔ A device that converts high-voltage electricity to low-voltage, high-current electricity for
welding.
What does the term "electrode efficiency" refer to?
✔✔ The ratio of deposited weld metal to the total consumed electrode material.
How can a welder ensure consistent weld bead appearance?
4
