Welding Level 2, Module 6 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

Welding Level 2, Module 6 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What is the main purpose of preheating metal before welding? Preheating reduces the risk of cracking by minimizing the temperature difference between the weld and the base metal. Why is proper electrode storage important in welding? Proper storage prevents electrodes from absorbing moisture, which can lead to porosity in the weld. What is the function of a backing strip in welding? A backing strip supports the molten weld metal and prevents it from falling through the joint. How can you ensure a clean weld surface before starting? Remove dirt, rust, oil, and other contaminants from the weld area to ensure proper fusion. 2 What happens if you use excessive heat during welding? Excessive heat can weaken the weld, cause warping, and increase the risk of defects like undercutting. Why is controlling the travel speed important during welding? Travel speed affects penetration, bead shape, and overall weld quality. What is the purpose of post-weld heat treatment? Post-weld heat treatment relieves residual stresses and improves the weld's mechanical properties. Why is shielding gas important in welding? Shielding gas protects the weld pool from atmospheric contamination like oxygen and nitrogen. What causes porosity in a weld? Porosity is caused by trapped gas pockets, often due to contaminants or improper shielding gas coverage. 3 What is the advantage of a weave pattern in welding? A weave pattern ensures better coverage of the joint and helps distribute heat evenly. How do you prevent burn-through when welding thin materials? Use lower amperage, faster travel speed, and a smaller electrode to avoid burn-through. Why is it important to check for root penetration during welding? Proper root penetration ensures joint strength