Why does MIG wire get stuck?

Why does MIG wire get stuck?

One of the most common reasons behind the MIG welder being jammed is a faulty gun liner. This sensitive part stays in contact with the wires almost all the time. So, if the gun liner is damaged, clogged, kinked, or dirty, the MIG welder won’t feed properly.

When should I replace my MIG liner?

In most cases, a worn out liner will need to be replaced. With a conventional liner, trimming the liner accurately during replacement is critical. Liners trimmed too long or too short can cause wire feeding issues, wire chatter, an erratic arc and/or burnbacks.

Why does my MIG wire keep burning back?

Burn back is also very common. It results when a weld forms in the contact tip. It usually occurs when the wire is fed too slowly or the MIG gun is held too close to the base metal. To correct burn back, increase the wire feed speed and lengthen the distance of the MIG gun from the workpiece.

What will cause a wire to feed erratically?

Erratic wire feeding A worn out or kinked liner, or build-up of debris, filings, dirt and other foreign material inside the welding liner, the wrong size liner and misalignments or gaps at the liner junctions caused by an improperly trimmed liner can all cause the wire to feed erratically.

How do I know if my MIG liner is bad?

Poor or erratic wire feeding, a loss of amperage or frequent contact tip burnback are all signs of liner problems. Unfortunately, because of the time it takes to replace the liner, this is often one of the last components checked during a troubleshooting effort.

What causes burnback?

Burnback happens when your wire arcs at the opening of the contact tip and burns back into it, welding itself to or inside the tip. Burnback is specifically a MIG problem, as it only occurs with a continuously fed wire through a small contact tip opening. Once your wire has burnt back, it’s game over.

What is burn back time?

For instance, certain welding machines have a “Burnback Control” setting, which adjust the amount of time that the welding wire remains electrically energized after the wire feeding has stopped. Setting your Burnback Control to the wrong setting can cause the wire to stick to your work.