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4.3.4 MIG Torch Liner Types and Information
MIG Torch Liners
The liner is both one of the simplest and most important components of a MIG gun. Its sole
purpose is to guide the welding wire from the wire feeder, through the gun cable and up to the
contact tip.
Steel Liners
Most MIG gun liners are made from coiled steel wire also known as piano wire, which provides
the liner with good rigidity and flexibility and allows it to guide the welding wire smoothly through
the welding cable as it bends and flex during operational use. Steel liners are primarily used for
feeding of solid steel wire, other wires such as Aluminum, Silicon Bronze, Etc. will perform better
using a Teflon or Polyamide line. The internal diameter of the liner is important and relative to the
wire diameter being used. The correct inside diameter and will assist in smooth feeding and
prevention of the wire kinking and bird-nesting at the drive rollers. Also bending the cable too
tightly during welding increases the friction between the liner and the welding wire making it
more difficult to push the wire through the liner resulting in poor wire feeding, premature liner
wear and bird-nesting. Dust, grime and metal particles can accumulate inside the liner over time
and cause friction and blockages, it is recommended to periodically blow out the liner with
compressed air. Small diameter welding wires, 0.6mm through 1.0mm have relatively low
columnar strength, and if matched with an oversized liner, can cause the wire to wander or drift
within the liner. This in turn leads to poor wire feeding and premature liner failure due to excessive
wear. By contrast, larger diameter welding wires, 1.2mm through 2.4mm have much higher
columnar strength but it is important to make sure the liner has enough internal diameter
clearance. Most manufacturers will produce liners sized to match wire diameters and length of
welding torch cable and most are color coded to suit.
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