Firepower MST 180i Operating Manual page 60

Firepower MST 180i
Solving Problems Beyond the Welding Terminals - Inconsistent Wire Feed
Wire feeding problems can be reduced by checking the following points.
1 Feed roller driven by motor in the
cabinet slipped.
2 Wire spool unwinds and tangles.
3 Worn or incorrect feed roller size
4 Wire rubbed against the misaligned
guides and reduced wire feed-ability.
5 Liner blocked with swarf
6 Incorrect or worn contact tip
7 Poor work lead contact to work piece
8 Bent liner
BASIC WELDING GUIDE
FAULT
A Use a feed roller matched to the size you are welding.
B Replace feed roller if worn.
A Increased amounts of swarf are produced by the wire
B Swarf can also be produced by the wire passing
C Swarf is fed into the conduit liner where it accumu-
A The Velocity contact tip transfers the weld current
B When using soft wire such as aluminum it may be-
Table 4-3: Wire Feeding Problems
4-6
CAUSE
Wire spool brake is too tight.
Wire spool brake is too loose.
Misalignment of inlet/outlet guides.
passing through the feed roller when excessive pres-
sure is applied to the pressure roller adjuster.
through an incorrect feed roller groove shape or size.
lates thus reducing wire feed-ability.
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
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.
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 feed-ability.
Manual 0-5339