Wire pile-ups due to improper movement of wire through liner is known as:

Wire pile-ups due to improper movement of wire through liner is known as:

• A. Arc cross firing
• B. Wire extension
• C. Bird nesting
• D. Stubbing

Answer: (C)

Bird nesting happens when the wire doesn’t move smoothly through the liner and instead bunches up or twists back on itself inside the liner. This creates a wire pile‑up or “nest” that blocks the feed and stops the weld. It’s caused by factors like the wrong liner size for the wire, a damaged or dirty liner, excessive bends or a kink in the wire path, or drive-roll tension that’s too high or too low, along with too long or inconsistent stick‑out. The fix is to ensure a straight, clean path with the correct liner and wire combination, set proper drive tension, keep the wire end square and clean, and avoid sharp bends or excessive stick‑out. Other terms describe different feeding faults: arc cross firing refers to the arc path misalignment, wire extension involves the wire sticking out too far from the contact tip, and stubbing is when the wire physically jams at the tip or in the work path.

Bird nesting happens when the wire doesn’t move smoothly through the liner and instead bunches up or twists back on itself inside the liner. This creates a wire pile‑up or “nest” that blocks the feed and stops the weld. It’s caused by factors like the wrong liner size for the wire, a damaged or dirty liner, excessive bends or a kink in the wire path, or drive-roll tension that’s too high or too low, along with too long or inconsistent stick‑out. The fix is to ensure a straight, clean path with the correct liner and wire combination, set proper drive tension, keep the wire end square and clean, and avoid sharp bends or excessive stick‑out. Other terms describe different feeding faults: arc cross firing refers to the arc path misalignment, wire extension involves the wire sticking out too far from the contact tip, and stubbing is when the wire physically jams at the tip or in the work path.