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B-15
MAKING A STITCH WELD IN AUTO MODE
A stitch weld is used to weld thin material because
warpage and burnthrough are a problem. Properly ad-
justing the ON and OFF times and arc travel speed, per-
mits welding thin sheet metal using small welds that
result in minimum distortion and no burnthrough.
To make a stitch weld
1. Set the procedure for the metal thickness to be
welded.
2. Press STITCH key. Stitch screen is displayed.
3. Press CENTER ARROW keys to set Stitch ON
time. Start with a Stitch ON time setting of 0.5 sec-
onds. Increase the Time ON setting to increase
penetration and weld size. Decrease the Time ON
setting to reduce burnthrough and distortion.
4. Press the RIGHT ARROW keys to set the Stitch
OFF time.
Start with a Time OFF setting of 0.5
seconds. Increase the Time OFF setting to reduce
burnthrough. Decrease the Time OFF setting to
produce a flatter and smoother weld.
5. Press STITCH key. Auto screen is displayed. Stitch
timer status is display in lower left portion of screen.
6. Close the gun trigger and hold it closed for the
length of seam. Hold gun in one place during ON
time and move gun just beyond edge of molten
metal during OFF time. For smoothest welds on
thinner metal, point gun slightly towards the direc-
tion of travel.
USING THE GUN TRIGGER SWITCH
The Gun Trigger Switch turns on arc voltage, wire
feeder, and gas solenoid (except with Innershield) when
the Gun Trigger Switch is closed. When closed, the
LED screen displays the Auto or Manual screens, de-
pending on which mode is being used. When the Gun
Trigger Switch is released, or opened, arc voltage, wire
feeder, and gas solenoid are turned off.
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 stick out. The 2 second limit permits
high speed loading of the gun and cable.
OPERATION
USING THE GUN THUMB SWITCH (MAG-
NUM 250SP GUN ONLY)
The Gun Thumb switch is used to control wire feed
speed, arc voltage, or to switch, or toggle, between
memory locations 4 and 5. See IPM VOLTS key and
TOGGLE key for control details. The Thumb switch is
used to increase or decrease IPM or VOLTS.
THE WIRE DRIVE ROLL
The drive roll provided with the SP-255 has two
grooves, one for .030"-.035" (0.8-0.9mm) solid steel
electrode, and the other for .045" (1.2mm) solid steel
electrode. The welder is shipped with the drive roll in-
stalled in the .030"-.035" (0.8-0.9mm) position as indi-
cated by the stenciling on the exposed side of the drive
roll. If .045" (1.2mm) electrode is to be used or one of
the optional drive rolls is required, then the drive roll
must be reversed or changed per the instructions pro-
vided on the instruction decal inside the SP-255 Drive
Roll Access door.
FAN CONTROL
The fan motor is thermostatically controlled to provide
cooling for the transformer and other components only
when required. Even though the power switch is on,
the fan motor will not run when the machine does not
require fan cooling, such as when first turned on, or
when welding at low current of duty cycle procedures.
INPUT LINE VOLTAGE
PROTECTION
HIGH LINE VOLTAGE -- If the line voltage exceeds
121% of rated input voltage, the output will be reduced
to the lower level to protect voltage rating of the capac-
itor bank. A HIGH LINE message will be displayed if
the output has been reduced (see Section on Explana-
tion of Prompting and Error Messages in Trou-
bleshooting Section.)
LOW LINE VOLTAGE -- You may not be able to get
maximum output from the machine if the line voltage is
less than rated input. If the output you want is not ob-
tainable because of insufficient line voltage, a LOW
LINE message will be displayed (see Section on Expla-
nation of Prompting and Error Messages in Trou-
bleshooting Section.) The unit will continue to weld, but
the output will be less than what is set.
IDEALARC
SP-255
®
B-15
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Troubleshooting
