Tweco 210 MIG Thermal Arc Fabricator - Manual (Page 58)

FABRICATOR 210
SERVICE 5-4 Manual No. 0-4855
!
WARNING
Disengage the drive roll when testing for gas flow by ear.
2. Inconsistent wire feed
FAULT CAUSE REMEDY
1. Wire spool
brake is too
tight.
a. Feed roller driven by motor in the cabinet will slip.
2. Wire spool
brake is too
loose.
a. Wire spool can unwind and tangle
3. Worn or
incorrect
feed roller size.
a. Use ‘U’ groove drive feed roller matched to the
aluminum wire size you are welding.
b. Use ‘V’ groove drive feed roller matched to the steel
wire size you are welding.
C. Use ‘knurled V’ groove drive feed roller matched to
the flux cored wire size you are welding.
4. Misalignment of
inlet/outlet
guides.
a. Wire will rub against the misaligned guides and
reduces wire feedability.
5. Liner blocked
with swarf.
a. Swarf is produced by the wire passing through the feed
roller, if excessive pressure is applied to the pressure
roller adjuster. Swarf can also be produced by the wire
passing through an incorrect feed roller groove shape
or size. Swarf is fed into the liner where it
accumulates thus reducing wire feedability.
6. Incorrect or
worn contact
tip.
a. The contact tip transfers the weld current to the
electrode wire. If the hole in the contact tip is too
large then arcing may occur inside the contact tip
resulting in the electrode wire jamming in the contact
tip. When using soft electrode wire such as aluminum
it may become jammed in the contact tip due to
expansion of the wire when heated. A contact tip
designed for soft electrode wires should be used.
7. Poor work lead
contact to work
piece. a. If the work lead has a poor electrical contact to the
work piece then the connection point will heat up and
result in a reduction of power at the arc.
8. Bent liner.
a. This will cause friction between the wire and the liner
thus reducing wire feedability.
Inconsistent
Wire Feeding
Figure 5-2: Trouble Shooting for Inconsistent Wire Feed