Bird-nesting in a MIG welding setup most commonly occurs between the drive rollers and liner.

• A. between the power source and ground
• B. on the nozzle
• C. near the welding rod
• D. between the drive rollers and liner

Answer: (D)

Bird-nesting happens when the wire can’t feed freely through the gun, causing it to buckle and pile up into a tangled nest. The most common place for this to occur in MIG welding is right where the wire leaves the drive rollers and enters the liner. If the liner is bent, dirty, or damaged, or the wire size, drive tension, or tip fit isn’t correct, the wire is forced into a tight, restrictive path and buckles instead of feeding straight through. That tight section, between the drive rollers and the liner, is the first bottleneck the wire meets, so problems there show up as a bird-nest.

If the issue were elsewhere, like between the power source and ground, you’d be looking at an electrical issue rather than a feeding jam. On the nozzle or near the tip, you’d typically see problems related to spatter or contact tip wear, not a nest forming inside the path of feed. And MIG uses a wire electrode, not a welding rod, so “near the welding rod” isn’t the true area of the problem.