Q1: How can misalignment be controlled during welding?
A: Ensure good fit-up quality by controlling the joint gap, misalignment amount, and socket length. Use tack welding or fixtures to secure the pipes and prevent distortion or movement-5.
Q2: What are the key parameters to control during the welding process?
A: Control the welding temperature to avoid burn-through or lack of fusion. Manage the number of layers, bead width, and height to ensure strength and sealing. Clean slag and spatter from each layer and stagger the start and stop points-5.
Q3: What inspections are required after welding?
A: Necessary post-weld inspections include visual inspection, nondestructive testing (NDT) like radiographic or ultrasonic examination, pressure tests, and leak tests to ensure the pipeline meets design and code requirements-5.
Q4: Why is weld and Heat-Affected Zone (HAZ) toughness important?
A: Adequate toughness helps delay or prevent the initiation and propagation of cracks. Insufficient toughness in the weld or HAZ is a form of performance degradation that can lead to failure-6.
Q5: What safety measures are vital during pipeline welding?
A: Adhere to safety (operating procedures) to prevent electric shock, fire, or poisoning. Use personal protective equipment (PPE) and ventilation facilities to protect personnel-5.
