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B-8
OPERATION
B-8
WIRE-MATIC 250
NOTE: The unit will remember the run-in mode from
the previous power down and return you to that same
state the next time you power up. Therefore, it is not
necessary to repeat either of the above procedures
each time the unit is powered up. You need only per-
form one of the above procedures when you want to
change the run-in mode.
NOTE. When the gun trigger is first closed before turn-
ing on the welder, there is no output power or wire feed
until the trigger is opened and re-closed, regardless of
the WIRE SPEED CONTROL POTENTIOMETER
KNOB setting.
MAKING A WELD
1.
Check that the electrode polarity is correct for the
process being used.
2.
Turn the POWER SWITCH to ON.
3.
Set desired arc voltage and wire speed for the
electrode wire, material type and thickness, and
gas (for GMAW) being used.
NOTE: Use the Application Chart on the door inside
the wire compartment as a quick reference for some
common welding procedures.
NOTE: If Timer Kit is installed, see the Accessories
Section of this manual to select the desired mode and
for additional welding information Spot and Stitch
modes.
4.
Inch the electrode through the gun and cable.
5.
Cut the electrode within approximately 3/8"
(10mm) of the end of the contact tip or 3/4" (20mm)
for Outershields.
NOTE: When the trigger is pulled, the wire feeder
feeds wire at low speed regardless of the set wire feed
speed until the welding arc starts or 2 seconds has
elapsed. This feature enhances starting and makes it
easier to set the stickout. The 2 second limit permits
high speed loading of the gun and cable. To change
run-in mode, refer to
Changing Run In Mode Section.
6.
If welding gas is to be used, turn on the gas supply
and set the required flow rate (typically 25-35 CFH;
12-16 Liters/min).
NOTE: When using Innershield electrode, the gas
nozzle may be removed from the insulation on the end
of the gun. This will give improved visibility and elimi-
nate the possibility of the gas nozzle overheating.
7.
Connect the work cable to metal to be welded.
Work clamp (if used) must make good electrical
contact to the work. The work must be grounded.
When using an open arc process, it is necessary to
use correct eye, head and body protection.
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8.
Position electrode over joint. End of electrode may
be lightly touching the work.
9.
Lower welding helmet, close gun trigger, and begin
welding. Hold the gun so the contact tip to work
distance is about 3/8 inch (10mm) or 3/4" (20mm)
for Outershield.
10. To stop welding, release the gun trigger and then
pull the gun away from the work after the arc goes
out.
11. When no more welding is to be done, close the
valve on gas cylinder (if used), momentarily oper-
ate gun trigger to release gas pressure.
12. Turn POWER SWITCH to OFF.
WARNING
