Welding 2, Module 8 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

Welding 2, Module 8 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified How does the choice of welding electrode affect the weld quality? The welding electrode type determines the arc stability, weld penetration, and overall strength of the weld. Why is it important to maintain proper electrode angle during welding? Maintaining the correct electrode angle ensures a stable arc, uniform weld bead, and reduces the risk of defects. What does "heat-affected zone" (HAZ) refer to in welding? The HAZ is the area surrounding the weld where the material's properties are altered due to the heat from welding. How does controlling the heat input in welding affect the final result? Proper heat input ensures adequate penetration, minimizes distortion, and prevents burning through the material. 2 Why is preheating necessary for some materials before welding? Preheating reduces the risk of cracking by lowering the cooling rate and reducing thermal stresses in the material. What is the effect of weld metal cooling rate on the final weld properties? A fast cooling rate can lead to brittle welds, while a controlled cooling rate promotes stronger, more ductile welds. Why is it important to remove contaminants from the base metal before welding? Contaminants like oil, rust, or paint can lead to poor weld quality, defects, and weak bonds in the final weld. What is the significance of the "root pass" in multi-pass welding? The root pass is the first weld layer, which forms the foundation for subsequent weld layers and ensures proper fusion. How does the base metal thickness influence the welding process? Thicker base metals may require more heat, larger electrodes, or different welding techniques to ensure proper penetration. 3 What is the purpose of a weld bead inspection? Inspecting the weld bead ensures it is free of defects like cracks, porosity, or undercuts, ensuring the integrity of the weld. What is the difference between butt weld and fillet weld? A butt weld joins two pieces of metal edge-to-edge, while a fillet weld joins two pieces at a right angle. Why is it important to maintain a consistent travel speed during welding? Consistent travel speed ensures an even weld bead, preventing defects like undercut, porosity, or excessive spatter.