OPERATION
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Teflon and Polyamide (PA) Liners
Teflon liners are well suited for feeding soft wires with poor column strength like
aluminum wires. The interiors of these liners are smooth and provide stable feeding,
especially on small diameter welding wire Teflon can be good for higher 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 aluminum. 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.
Copper - Brass Neck Liners
For high heat applications fitting brass or copper wound jumper or neck liner on the end
of the liner at the neck end will increase the working temperature of the liner as well as
improve the electrical conductivity of the welding power transfer to the wire. It is
recommended for all Aluminum and Silicone Bronze welding applications.
§4.3.7 Torch & Wire Feed Set-Up for Aluminum Wire
The same method is used for Teflon and/or Polyamide Liners (PA).
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