V4.0
MINIMIG 100E Flux-Cored Welder
8976052
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23
3.
Replace the nozzle when you can no
longer clean the slag out. Failure to
keep the nozzle adequately cleaned
can result in the following problems:
a.
A shorted nozzle results when
spatter buildup bridges the
insulation in the nozzle, allowing
welding current to flow through
the spatter as well as the contact
tip. A shorted nozzle will steal
welding current from the wire
whenever it contacts the
grounded workpiece. This causes
erratic welds and reduced penetration. In addition, a shorted nozzle
overheats and may damage the torch’s front end. See Testing for a
Shorted Nozzle
b. A restricted nozzle is created when enough slag builds up in the
nozzle to affect the direction, concentration and/or flow rate of the
shielding gas. This problem can cause porous, brittle welds and
reduce penetration.
TESTING FOR A SHORTED NOZZLE
Arcing between the nozzle and the workpiece always means the nozzle is
shorted, but this can be hard to detect through the lens of a welding helmet.
The following testing method is another way to tell if a nozzle is shorted.
With the welding unit unplugged from the ac power source, touch the probes
of an ohmmeter or continuity tester to the end of the contact tip and the
outside of the nozzle. If there is any continuity at all, the nozzle is shorted.
Clean or replace the nozzle as needed.
REPLACE A TORCH LINER
The torch liner is intended to provide an unrestricted path for the welding wire to
flow through the torch assembly. Over time the liner will accumulate dust, dirt and
other debris. Replacement is necessary when these accumulations begin to restrict
the free flow of wire through the torch assembly.
Care must be taken not to kink or otherwise damage the torch liner during
installation. See Fig. 6 for the drive assembly and Fig. 7 for the torch assembly. The
torch assembly with this unit may be slightly different than the image for Fig. 7.
1.
Turn OFF the welding unit’s power switch and unplug the welding unit
from the power supply.
Fig. 6
