Weldforce 155
M &
175
MST
© Weldclass 2020 | E.&O.E.
43
11.11.2
Wire Feed Problems
TOP TIPS - Wire Jam Troubleshooting
•
If wire jam occurs when the torch becomes hot, this is often because the heat causes the wire
and the top to expand (which shrinks the hole in the tip). Using a slightly oversize tip can
prevent this – e.g.: for 0.9mm wire, use a 1.0mm tip.
•
Do NOT over-tighten the drive roll tension – this will accelerate wear if the drive system, distort
the wire & will cause further wire feed problems.
Table 13
Wire feeding problems can be reduced by checking the following points.
The most common faults are marked with *:
Troubleshooting – Wire Feed
Fault
Cause
Feed roller driven by motor in the cabinet
slipping
Wire spool brake is too tight.
Wire spool unwound and tangled.
Wire spool brake is too loose.
Worn or incorrect feed roller size
Use a feed roller matched to the size you are
welding.
Replace feed roller if worn.
Wire rubbed against the misaligned guides
affecting the wire feed.
Misalignment of inlet/outlet guides.
* Liner blocked with swarf (Replace liner)
Increased amounts of swarf are produced by the
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 feed.
* 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 aluminum 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.
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 results in reduction of power at the arc.
Bent liner (Replace liner)
This will cause friction between the wire and the
liner this reducing wire feed.
Table 14
