Welding Level 2, Module 7 Questions
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the purpose of a backing bar in welding?
✔✔ A backing bar supports the base metal during welding to prevent burn-through and help
control heat.
Why is it important to clean the welding area before starting a weld?
✔✔ Cleaning the welding area removes contaminants, ensuring better weld quality and
preventing defects.
What does the term "heat-affected zone" (HAZ) refer to in welding?
✔✔ The heat-affected zone is the area of the base metal that is altered by the heat from the
welding process.
What is the role of shielding gas in welding?
✔✔ Shielding gas protects the weld pool from contamination by atmospheric gases such as
oxygen and nitrogen.
1
, What does the term "weld bead" refer to?
✔✔ The weld bead is the metal deposited during the welding process that forms the actual weld
joint.
What type of welding is typically used for thin materials, such as sheet metal?
✔✔ MIG welding (Metal Inert Gas) is commonly used for thin materials due to its speed and
ease of use.
How do you avoid distortion in welded metal?
✔✔ Use proper heat control, balance weld passes, and cool the material gradually to avoid
distortion.
Why is preheating necessary for some metals in welding?
✔✔ Preheating reduces the risk of thermal shock and helps prevent cracking in high-carbon
steels or thick metals.
What is the primary difference between AC and DC welding?
✔✔ AC (Alternating Current) is ideal for welding thin materials, while DC (Direct Current)
provides a more stable arc for thicker materials.
2
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the purpose of a backing bar in welding?
✔✔ A backing bar supports the base metal during welding to prevent burn-through and help
control heat.
Why is it important to clean the welding area before starting a weld?
✔✔ Cleaning the welding area removes contaminants, ensuring better weld quality and
preventing defects.
What does the term "heat-affected zone" (HAZ) refer to in welding?
✔✔ The heat-affected zone is the area of the base metal that is altered by the heat from the
welding process.
What is the role of shielding gas in welding?
✔✔ Shielding gas protects the weld pool from contamination by atmospheric gases such as
oxygen and nitrogen.
1
, What does the term "weld bead" refer to?
✔✔ The weld bead is the metal deposited during the welding process that forms the actual weld
joint.
What type of welding is typically used for thin materials, such as sheet metal?
✔✔ MIG welding (Metal Inert Gas) is commonly used for thin materials due to its speed and
ease of use.
How do you avoid distortion in welded metal?
✔✔ Use proper heat control, balance weld passes, and cool the material gradually to avoid
distortion.
Why is preheating necessary for some metals in welding?
✔✔ Preheating reduces the risk of thermal shock and helps prevent cracking in high-carbon
steels or thick metals.
What is the primary difference between AC and DC welding?
✔✔ AC (Alternating Current) is ideal for welding thin materials, while DC (Direct Current)
provides a more stable arc for thicker materials.
2
