Cag (Carbon Arc Gouging); Gmaw (Gas Metal Arc Welding) - Thermal Arc POWERMASTER 350P Service Manual

4.07 CAG (Carbon Arc Gouging)

1. Connect the welding leads to the output terminals of
the power source. Normally the work lead should
connect to the negative lead and the electrode holder
to the positive terminal (DCEP or reverse polarity).
2. If a remote control is being used, connect to the 14 or
19-pin remote receptacle on the rear of the power
source.
3. Turn the control power switch ON, located on the front
panel of the power source. The digital display on the
power source should be activated.
4. Set the front panel mode switch to CAG.
5. Preset the weld amperage using the front panel amps/
volts control, by placing the meter amps/volts switch
in the amps position, and the local/remote switch in
the local position.
6. If a remote control is being used, place the local/remote
switch in the remote position. The remote control will
have full control of the output of the power source
from minimum to maximum.
7. Energize the output of the power source with either
the front panel output contactor ON/OFF switch or by
the switch on the remote control if one is being used.
There will now be open circuit voltage present on the
output terminals of the power source.
8. The power source is now ready to arc gouge.
For CAG mode, the arc force/inductance control
is not active. The optimum arc characteristics
are built into the power source.
March 17, 2006
NOTE
POWERMASTER 500, 500P, 350, 350P

4.08 GMAW (Gas Metal Arc Welding)

1. Connect the wire feeder to the power source. Connect
the control cable to the 19-pin receptacle or the 14-
pin receptacle on the rear of the power source. Connect
the electrode cable from the wire feeder to the output
terminal of the power source (normally positive for
DCEP). Connect the other output terminal of the power
source to the workpiece.
2. Turn the control power switch ON, located on the front
panel of the power source. The digital display on the
power source should be activated.
3. Set the front panel mode switch to GMAW.
4. Preset the weld voltage using the front panel amps/
volts control, by placing the meter amps/volts switch
in the volts position, and the local/remote switch in
the local position.
5 If the wire feeder has remote voltage control, place
the local/remote switch on the front of the power
source in the remote position. This will allow the wire
feeder to control the preset voltage of the power source.
6. Set the inductance control to the desired inductance
setting. Full clockwise is maximum inductance. Higher
inductance settings make the arc "softer" with less
spatter. Lower inductance settings give a stronger
"driving" arc. The inductance should be set according
to the type of wire and gas and desired arc
characteristics desired. Generally, the inductance
control can be set at mid-range as a good starting point.
The inductance control is primarily used for
the short-circuiting transfer mode of MIG
welding. For globular or spray transfer modes
the inductance control has minimal effect.
7. The power source is now ready to weld.
8. To end the weld, release the torch switch while holding
the torch in place at the end of the weld. This will allow
the wire sharpening circuit in the power source to
condition the end of the wire for the next weld. The wire
sharpening circuit will tend to leave a very small ball on
the end of the wire, thus making the next start easier.
NOTE
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