Transmig 210, 250, 310, 330
DOC No: MIGTRN0001 Page 27 of 31
Issue No: 2 Date: 14/09/98
b) Inconsistent wire feed
Wire feeding problems can be reduced by checking the following points.
1. Wire spool brake is too tight - Feed roller driven by motor in the cabinet will
slip.
2. Wire spool brake is too loose - Wire spool can unwind and tangle.
3. Worn or incorrect feed roller size - Use 'U' groove drive feed roller matched to the
aluminium wire size you are welding.
Use 'V' groove drive feed roller matched to the
steel wire size you are welding.
Use ‘knurled V’ groove drive feed roller matched
to the flux cored wire size you are welding.
4. Mis-alignment of inlet/outlet guides - Wire will rub against the mis-aligned guides and
reduces wire feedability.
5. Liner blocked with swarf - Increased amounts of swarf is produced by the
electrode wire passing through the feed roller
when 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 conduit liner where it
accumulates thus reducing wire feedability.
6. Incorrect or worn contact tip - 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 wire jamming in the contact tip.
When using soft wire such as aluminium it may
become jammed in the contact tip due to
expansion of the wire when heated. A contact tip
designed for soft wires should be used.
7. Poor work lead contact to work piece - 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 - This will cause friction between the wire and the
liner thus reducing wire feedability
