Tweco 175i Transtig - Manual (Page 46)

TRANSMIG 175i
BASIC WELDING GUIDE 4-8 Manual 0-5143
Solving Problems Beyond the Welding Terminals - Inconsistent Wire Feed
Wire feeding problems can be reduced by checking the following points.
FAULT CAUSE
1Feed roller driven by motor in the
cabinet slipped.
Wire spool brake is too tight.
2Wire spool unwinded and tangled. Wire spool brake is too loose.
3Worn or incorrect feed roller size AUse a feed roller matched to the size you are welding.
BReplace feed roller if worn.
4Wire rubbed against the mis-aligned
guides and reduced wire feedability.
Mis-alignment of inlet/outlet guides
5Liner blocked with swarf AIncreased amounts of swarf are produced by the wire
passing through the feed roller when excessive pres-
sure is applied to the pressure roller adjuster.
BSwarf can also be produced by the wire passing
through an incorrect feed roller groove shape or size.
CSwarf is fed into the conduit liner where it accumu-
lates thus reducing wire feedability.
6Incorrect or worn contact tip AThe contact tip transfers the weld current to the elec-
trode 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
BWhen 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.
7Poor 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.
8Bent liner This will cause friction between the wire and the liner
thus reducing wire feedability
Table 4-3: Wire Feeding Problems