NCCER Module Six Weld Quality
Questions and Answers | Latest Version
| 2024/2025 | 100% Correct
What is the purpose of weld inspection?
✔✔ Weld inspection ensures the quality, strength, and integrity of a weld, confirming it meets
industry standards and safety requirements.
What are the common types of weld defects?
✔✔ Common defects include porosity, cracks, undercut, incomplete fusion, and slag inclusion.
Why is it important to inspect welds for porosity?
✔✔ Porosity can weaken a weld by creating air pockets, leading to reduced strength and
durability.
What is a cold weld, and how does it affect the joint?
✔✔ A cold weld occurs when the metal does not fuse properly due to insufficient heat, leading
to a weak joint that may fail under stress.
1
, How does the size of the weld bead affect the strength of a weld?
✔✔ A properly sized weld bead ensures adequate fusion between materials, providing the
necessary strength for the joint.
What role does the welding procedure specification (WPS) play in ensuring weld quality?
✔✔ The WPS outlines the welding process, material type, and parameters, guiding welders to
ensure consistent quality and strength.
What is the significance of the heat-affected zone (HAZ) in welding?
✔✔ The HAZ is the area of the base metal that is heated during welding but not melted. It can be
affected by heat, potentially weakening the material.
Why is it essential to ensure proper cleaning of metal surfaces before welding?
✔✔ Contaminants like oil, rust, and dirt can cause defects like porosity, affecting weld strength
and quality.
What is the purpose of post-weld heat treatment (PWHT)?
✔✔ PWHT relieves internal stresses in the weld and base metal, reducing the risk of cracking
and distortion.
2
Questions and Answers | Latest Version
| 2024/2025 | 100% Correct
What is the purpose of weld inspection?
✔✔ Weld inspection ensures the quality, strength, and integrity of a weld, confirming it meets
industry standards and safety requirements.
What are the common types of weld defects?
✔✔ Common defects include porosity, cracks, undercut, incomplete fusion, and slag inclusion.
Why is it important to inspect welds for porosity?
✔✔ Porosity can weaken a weld by creating air pockets, leading to reduced strength and
durability.
What is a cold weld, and how does it affect the joint?
✔✔ A cold weld occurs when the metal does not fuse properly due to insufficient heat, leading
to a weak joint that may fail under stress.
1
, How does the size of the weld bead affect the strength of a weld?
✔✔ A properly sized weld bead ensures adequate fusion between materials, providing the
necessary strength for the joint.
What role does the welding procedure specification (WPS) play in ensuring weld quality?
✔✔ The WPS outlines the welding process, material type, and parameters, guiding welders to
ensure consistent quality and strength.
What is the significance of the heat-affected zone (HAZ) in welding?
✔✔ The HAZ is the area of the base metal that is heated during welding but not melted. It can be
affected by heat, potentially weakening the material.
Why is it essential to ensure proper cleaning of metal surfaces before welding?
✔✔ Contaminants like oil, rust, and dirt can cause defects like porosity, affecting weld strength
and quality.
What is the purpose of post-weld heat treatment (PWHT)?
✔✔ PWHT relieves internal stresses in the weld and base metal, reducing the risk of cracking
and distortion.
2
