ESAB fabricator 141i Operating Manual page 40

ESAB FABRICATOR 141i
Solving Problems Beyond the Welding Terminals - Inconsistent Wire Feed
Wire feeding problems can be reduced by checking the following points.
FAULT
1 Feed roller driven by motor in the
cabinet slipped
2 Wire spool unwinds and tangles
Wire slipping
3
Wire rubbed against the mis-aligned
4
guides and reduced wire feedability.
5 Liner blocked with debris
6 Incorrect or worn contact tip
7 Poor work lead contact to work piece
8 Bent liner
BASIC WELDING GUIDE
Wire spool brake is too tight or drive roll tension not
tight enough.
Wire spool brake is too loose.
Worn or incorrect feed roller size. Use a feed roller
A
matched to the size you are welding.
B Replace feed roller if worn.
Mis-alignment of inlet/outlet guides
A Increased amounts of debris are produced by the
wire passing through the feed roller when excessive
pressure 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
accumulates thus reducing wire feedability.
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 wire jamming in the contact tip.
B When using soft wire such as aluminum it may
become jammed in the contact tip due to expansion of
the wire when heated. A Velocity contact tip designed
for soft wires should be used.
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.
This will cause friction between the wire and the liner
thus reducing wire feedability
Table 4-3: Wire Feeding Problems
4-6
CAUSE
Manual 0-5420