What is a “birdnest” in wire feeding, and how can you prevent it?

• A. A tangled coil of wire at or near the contact tip; prevent with proper spool winding, clean liners, correct wire tension, and correct feeding path.
• B. A birdnest is a bird that nests in the workshop, causing distraction.
• C. A birdnest is a MIG welding technique.
• D. A birdnest is a defective weld bead.

Answer: (A)

A birdnest is a tangled coil of welding wire that forms at or near the contact tip when the wire feeds unevenly. This jam happens when the wire doesn’t move smoothly from the spool through the liner to the tip, often due to issues like a spool that isn’t wound neatly, a dirty or worn liner, incorrect wire tension on the drive rolls, or a feeding path with sharp bends or twists. To prevent it, keep the spool wound neatly with no loose turns, maintain a clean and undamaged liner that’s properly seated, set the drive-roll tension so the wire is gripped consistently without crushing it, and route the wire along a straight, unobstructed path from the spool to the contact tip. Also verify the contact tip size matches the wire and that nothing in the feed path is causing a snag. These steps help ensure smooth feeding and reduce birdnest formation.