How to fit Teflon Liners (for Aluminium wire)

How to fit Teflon & Poly Liners (for Aluminium wire) to MIG Welding Torches

 

Contents:

The following contents are included in Weldclass "Universal Series" Liners.  Other liners may include only some of these parts.

A. Poly or Teflon Liner

B. Neck Liner

C. Collet and O-ring - for Euro connect torches

D. End Fitting for Tweco Style Torches

E. End Fitting for Bernard Style Torches

 

 

Typical Assembly Diagram:

Liner Assembly Diagram_Teflon.jpg

 

Fitting Instructions for Torches with Euro Connection:

1. You will need: liner with brass collet fitting (A) & the neck liner (B). 

2. Screw the neck liner (B) onto one end of the liner. Note: If the brass neck liner is difficult to screw onto the liner, it may be necessary to carefully trim/shave the liner with a sharp knife first.

3. Lie the MIG torch cable out flat & straight & remove existing liner

4. Remove the liner retaining nut at the connection end of the torch

5. Remove all parts on the neck of the torch (tip, nozzle, tip holder, gas diffuser, etc)

6. Starting at the connection end of the torch, gently push the teflon liner (starting with the neck liner first) into the torch until the liner protrudes from the torch neck. 

7. Pull the liner back just far enough to allow tip holder to be replaced. Replace the tip holder, tip, gas diffuser, nozzle, etc

8. At the connection end, carefully push the liner to make it seat against the back of the tip holder. Do NOT cut the liner. Slide the Brass Nipple then the O-ring over the liner until the brass nipple locates into the euro connector.  Make sure that the liner is still pushed firmly into the torch, replace the liner retaining nut & tighten gently (do not over tighten). 

9. If your welding machine has not already been set up with a Teflon/Poly liner, the Euro connection on the machine or wire feeder will most likely have a steel or brass guide tube inserted in the centre. You will need to remove this tube (with long-nosed pliers), so that the Teflon/Poly liner can continue through the euro connector to the drive rollers. See diagram above.

10. Lift the drive rollers to allow excess liner to pass through into the wire feeder. Feed liner protruding from torch into the euro connector / guide sleeve on the machine until the torch can be connected. Connect & tighten torch. 

11. Cut the liner so that it is as close to the drive rollers as possible. (The best tool to cut the liner is a razor sharp knife). The torch is now ready to use.

Note: If you are using aluminium wire, you must have the correct “U-groove” drive rollers & aluminium “clearance” contact tips.

 

 

Fitting Instructions for Torches with Non-Euro (Tweco 'Bayonet' or Bernard 'QD'/'EZ') Connection :

    

1. You will need: liner (A) with brass collet fitting (A) & the correct brass end fitting to suit  your torch (D/E)

2. Screw the neck liner (B) onto one end of the liner. Note: If the neck liner is difficult to screw onto the liner, it may be necessary to carefully trim/shave the liner with a sharp knife first.

3. Lie the MIG torch cable out flat & straight & remove existing liner

4. Remove the liner retaining nut at the connection end of the torch

5. Remove all parts on the neck of the torch (tip, nozzle, tip holder, gas diffuser, etc)

6. Starting at the connection end of the torch, gently push the liner (A) - starting with the neck liner first - into the torch until the neck liner protrudes from the torch neck. 

7. Pull the liner back just far enough to allow tip holder to be replaced. Replace the tip holder, tip, gas diffuser, nozzle, etc

8. At the connection end, put a mark on the liner flush with the connection of the torch

9. Pull the liner back a short distance, then cut the liner. The best tool to cut the liner is a razor sharp knife to avoid distorting the shape of the liner.

10 . Choose the correct Brass End Fitting (D/E) to suit your torch & screw brass end on the liner (brass end has an internal thread & should self-screw onto the liner). Note: If the brass end fitting is difficult to screw onto the liner, it may be necessary to carefully trim the liner with a sharp knife first.

11. Push the liner back into the torch until the brass end seats inside the end of the torch connection.

12. The torch can now be connected to the machine and is ready to use.

 

Note: If you are using aluminium wire, you must have the correct “U-groove” drive rollers & aluminium “clearance” contact tips.

 

 

 

While all care has been taken, Weldclass accepts no responsibility for any inaccuracies, errors or omissions in this information or links and attachments. Any comments, suggestions & recommendations are of a general nature only and may not apply to particular applications. It is the sole responsibility of the user and/or operator to select the appropriate product for their intended purpose and to ensure that the product selected is capable of performing correctly and safely in the intended application. E.&O.E.

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