A dirty conduit liner can cause which issue at the drive rolls?

A dirty conduit liner can cause which issue at the drive rolls?

• A. Porosity And Cracking In The Weld.
• B. Slippage Or Bird Nesting At The Drive Rolls.
• C. Excessive Undercut Or Lack Of Fusion.
• D. Damage To The Liner And Contact Tip.

Answer: (B)

When the conduit liner is clean, the welding wire feeds smoothly from the spool through to the contact tip. A dirty liner introduces debris, grit, or buildup that creates resistance and intervenes with the wire’s path. The drive rolls are supposed to grip the wire firmly to push it forward; with a dirty liner, that grip can fail or become inconsistent, so the wire may slip at the rolls. In some cases, debris can catch the wire and wrap it around the drive rolls or inside the liner, forming a tangled coil often called a bird nest. This jam stops proper feeding and leads to erratic wire advancement and welding performance. Other listed issues are tied to heat, shielding gas, or other problems, not the direct result of a dirty liner at the drive-roll area.

When the conduit liner is clean, the welding wire feeds smoothly from the spool through to the contact tip. A dirty liner introduces debris, grit, or buildup that creates resistance and intervenes with the wire’s path. The drive rolls are supposed to grip the wire firmly to push it forward; with a dirty liner, that grip can fail or become inconsistent, so the wire may slip at the rolls. In some cases, debris can catch the wire and wrap it around the drive rolls or inside the liner, forming a tangled coil often called a bird nest. This jam stops proper feeding and leads to erratic wire advancement and welding performance. Other listed issues are tied to heat, shielding gas, or other problems, not the direct result of a dirty liner at the drive-roll area.