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PRODUCT DESCRIPTION
The PM 255 is a complete semiautomatic constant
voltage DC arc welding machine built to meet NEMA
specifications. It combines a constant voltage power
source and a constant speed wire feeder with a micro-
computer-based controller to form a reliable high-per-
formance welding system. A simple control scheme,
consisting of continuous full range voltage and wire
feed speed controls, provides versatility with ease of
use and accuracy.
Other features include a 2" (51 mm) O.D. wire reel
spindle with adjustable brake, an integral gas cylinder
mounting undercarriage, an adjustable CO
blend flow regulator with cylinder pressure gauge and
inlet hose, a 12 ft. (3.6 m) Magnum 250L GMAW gun
and cable with fixed (flush) nozzle, a 10 ft. (3.0 m)
power cable with plug and mating receptacle, and a
10 ft. (3.0 m) work cable with clamp.
An Optional Timer kit provides variable burnback con-
trol, a spot function, a selectable 4-step trigger inter-
lock and adjustable "Run In" for wire starting optimiza-
tion. Also optional are a Spool Gun Adapter kit, a Dual
Cylinder Mounting kit and an Aluminum Feeding Kit
for push feeding with standard built in feeder.
RECOMMENDED PROCESSES AND
EQUIPMENT
The PM 255 is recommended for GMA welding
processes using 10 to 44 lb (4.5 to 20 kg) 2" (51 mm)
I.D. spools or Readi-Reel
adapter) of .025" through .045" (0.6 – 1.2 mm) solid
steel, .035" (0.9 mm) stainless, 3/64" (1.2 mm) alu-
minum and .045" (1.2 mm) Outershield
.035" (0.9 mm) and .045" (1.2 mm) Innershield
shielding electrodes.
The PM 255 is factory equipped to feed .035" (0.9
mm) electrodes and provides tip, guide, and drive rolls
for .045(1.2mm) electrode. It also includes a 200A,
60% duty cycle (or 250A, 40% duty cycle) rated, 12 ft.
(3.6 m) GMAW gun and cable assembly equipped for
these wire sizes. Use of GMAW processes requires a
supply of shielding gas.
WELDING CAPABILITY
The PM 255 is rated at 250 amps @ 26 volts, at a
40% duty cycle based on a ten minute cycle time. It is
capable of higher duty cycles at lower output currents
and capable of up to 300 Amps at lower duty cycles.
OPERATION
or Argon
2
®
coils (with optional
®
; as well as
®
self-
PM 255
LIMITATIONS
The PM 255 MAY NOT operate satisfactorily if pow-
ered with a portable or in-plant generating system.
DESCRIPTION OF CONTROLS
Power ON/OFF Switch — Place the lever in the "ON"
position to energize the PM 255. When the power is
on, the red LED display lights illuminate.
Voltage Control — This is a continuous control that
gives full range adjustment of power source output
voltage. It can be adjusted while welding over its 10 to
28 volt range.
Wire Speed Control — This controls the wire feed
speed from 50 – 700 inches per minute (1.2 – 17.8
m/min). The control can be preset on the dial to the
setting specified on the Procedure Decal on the inside
of the wire compartment door. Wire speed is not
affected when changes are made in the voltage con-
trol.
WIRE DRIVE ROLL
The drive rolls installed with the PM 255 each have
two grooves, both for .030-.035" (0.8-0.9 mm) solid
steel electrode. Drive roll size is indicated by the sten-
cilling on the exposed side of the drive roll. If feeding
problems occur, then the drive roll may be reversed or
changed. See "Procedure for Changing Drive Roll" in
this section. This information also appears on the
Procedure Decal on the door inside the wire compart-
ment. An additional drive roll set is provided for
.045"(1.2mm) solid steel electrode, packaged stan-
dard with each machine.
WIRE SIZE CONVERSION PARTS
The PM 255 is rated to feed .025 through .045" (0.6-
1.2 mm) solid or cored electrode sizes.
The drive roll kits and Magnum 250L gun and cable
parts are available to feed different sizes and types of
electrodes. See Accessories section.
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