Operation, Warning – Lincoln Electric WIRE-MATIC 255 SVM 119-A Manuel d'utilisation
Page 27
B-8
OPERATION
B-8
WIRE-MATIC 255
NOTE: Arc starting characteristics may be affected
when using the fast run-in mode since optimum start-
ing processes are being overriden.
When the trigger is closed at power up, no output
power or wire feed will be available until the trigger is
opened and reclosed, regardless of wire feed speed
dial setting.
It is not necessary to repeat either of the above proce-
dures each time the unit is powered up. The unit will
remember the run-in mode from the previous power
down and return you to that same state upon your next
power up. Thus, you need only perform one of the
above procedures when you want to change the run-in
mode.
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: If set to slow run-in, 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
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