used for feeding of solid steel wires, other wires such as Aluminium, Silicon Bronze etc will
perform better using a teflon or Polyamide line. The internal diameter of the liner is important and
releative to the wire diameter being used and will assit in smooth feeding and prevention of the
wire kinking and birdnesting 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, pre-mature liner wear and
birdnesting. Dust, grime and metal particles can accumalate 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
colour coded to suit.
Teflon and Polyamide (PA) Liners
Teflon liners are well suited for feeding soft wires with poor column strength like aluminium
wires. The interiors of these liners are smooth and provide stable feedability, especially on small
diameter welding wire Teflon can be good forhigher heat applications that utilize water-cooled
torches and brass neck liners. Teflon has good abrasion resistance characteristics and can be used
with a variety of wire types such as silicon bronze, stainless steel as well as aluminium. A note of
caution to careful inspect the end of the welding wire prior to feeding it down the liner. Sharp
edges and burrs can score the inside of the liner and lead to blockages and accelerated wear.
Polyamide Liners (PA) are made of carbon infused nylon and are ideal for softer aluminum,
copper alloy welding wires and push pull torch applications. These liners are generally fitted with
a floating collet to allow the liner to be inserted all the way to the feed rollers.
Blue-0.6mm-0.8mm
Red - 0.9mm - 1.2mm
Yellow - 1.6mm
Green - 2.0mm - 2.4mm
Steel Liners
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