Tweco Fabricator 141i Operating Manual - Manual (Page 68)

Fabricator 141i
BASIC WELDING GUIDE 4-8 Manual 0-5145
Solving Problems Beyond the Welding Terminals - Inconsistent Wire Feed
Wire feeding problems can be reduced by checking the following points.
FAULT CAUSE
1 Feed roller driven by motor in the
cabinet slipped
Wire spool brake is too tight or drive roll tension not
tight enough.
2 Wire spool unwinds and tangles Wire spool brake is too loose.
3 Wire slipping A Worn or incorrect feed roller size. Use a feed roller
matched to the size you are welding.
B Replace feed roller if worn.
4 Wire rubbed against the mis-aligned
guides and reduced wire feedability.
Mis-alignment of inlet/outlet guides
5 Liner blocked with debris A Increased amounts of debris are produced by the wire
passing through the feed roller when excessive pres-
sure is applied to the pressure roller adjuster.
B Debris can also be produced by the wire passing
through an incorrect feed roller groove shape or size.
C Debris is fed into the conduit liner where it accumu-
lates thus reducing wire feedability.
6 Incorrect or worn contact tip A The 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.
B When using soft wire such as aluminum it may be-
come jammed in the contact tip due to expansion of
the wire when heated. A Velocity 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
Table 4-3: Wire Feeding Problems
Basic MIG Welding Troubleshooting
FAULT CAUSE REMEDY
1 Undercut A Welding arc voltage too high. A Decrease voltage or increase the wire feed
speed.
B Incorrect MIG Gun angle B Adjust angle.
C Excessive heat input C Increase the MIG Gun travel speed and/or
decrease welding current by decreasing the
voltage or decreasing the wire feed speed.