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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.
2.
Open the welding unit's side panel.
3.
Loosen the drive tension adjustment knob
and lift the Drive tension arm up off the
drive roller.
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90A Flux Core Welder
9195264
Fig. 6
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