Climax AUTOBOREWELDER BW3000, Operating Manual

Page: 83 / 150

P/N 52815, Rev. 7 Page 67
5.2.4.3 Liner replacement
The replacement schedule for liners in the BoreWelder torches and conduits
depends on many factors. These factors include, but are not limited to, workplace
environment, welding wire used, welding parameters, feed roll pressure, and main-
tenance schedule.
Do the following when liner replacement is required:
1. When replacing the liner in any component which forms a curve that the
liner has to follow, it is important to preload the liner. The liner is pressed
into the torch or conduit until the liner is felt to be making contact with the
outer wall of the bend in the torch or conduit. This pressure should not
exceed 5 pounds.
2. When replacing the liner in a wirefeeder conduit, coil the conduit into a 24"
(60 mm) circle and push the liner in so it makes contact with the outer wall
of the conduit. Then secure it in place with the set screws while it’s in this
coiled position. Do not over- tighten the set screws when securing the liner.
3. Always clip the liner with a sharp set of diagonal cutters, in such a way that
the end of the liner is recessed at the end of the conduit or torch. The dis-
tance of recession should not exceed one coil, or approximately 0.050" (1
mm). This procedure prevents sharp liner ends from being exposed.
5.2.4.4 Replacement of contact tips for torches #00 and #0
When replacing the contact tips of torches #00 and #0, check that the contact tip is
positioned correctly in the nozzle. The tip should not be centrally located axially.
Instead, the tip should be secured so its exit end is closer to the end of the torch
nozzle. To determine the proper location and as a gauge between the tip and the
cup, use the same Allen wrench used to tighten the set screw holding the tip in
place. Do not preload the liner in either of these torches.
If replacement of the contact tip is required, it is not necessary to remove the liner.
Instead, loosen the screw that holds the contact tip, remove the tip, and insert a
new tip over the liner that is installed in the torch.
An alternative procedure is to remove the tip and the liner, and use a piece of weld-
ing wire as a “snake.” The welding wire is inserted into the liner hole in the
threaded end of the torch, out through the nozzle. Then the combination of new tip
and old liner can be slid onto the “snake” from the nozzle end, and the liner can
easily be piloted into the liner attachment area on the threaded end of the torch.
Do the following when replacing the liner on the #0 and #00 torches:
1. Remove the old tip and liner.
2. Using a length of liner that is too long, insert the new liner from the
threaded attachment end of the torch, out through the nozzle.