Operation; Product Description; Recommended Processes And Equipment; Welding Capability - Lincoln Electric POWER MIG 255 SVM144-B Service Manual

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PRODUCT DESCRIPTION

The POWER MIG™ 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
microcomputer-based controller to form a reliable high-
performance 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 in. (51 mm) O.D. wire reel
spindle with adjustable brake, an integral gas cylinder
mounting undercarriage, an adjustable CO 2 or Argon
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.

OPERATION

RECOMMENDED PROCESSES
AND EQUIPMENT
The POWER MIG 255 is recommended for GMA
welding processes using 10 to 44 lb (4.5 to 20 kg)
2 in. (51 mm) I.D. spools or Readi-Reel ® coils (with
optional adapter) of 0.025 in. through 0.045 in.
(0.6 to 1.2 mm) solid steel, 0.035 in. (0.9 mm)
stainless, 3/64 in. (1.2 mm) aluminum and 0.045 in.
(1.2 mm) Outershield ® ; as well as 0.035 in. (0.9 mm)
and 0.045 in. (1.2 mm) Innershield ® self-shielding
electrodes.
The POWER MIG is factory equipped to feed
0.035 in. (0.9 mm) electrodes and provides tip, guide,
and drive rolls for 0.045 in. (1.2 mm) 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 POWER MIG 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 cur-
rents and capable of up to 300 Amps at lower duty
cycles.

LIMITATIONS

The POWER MIG 255 MAY NOT operate
satisfactorily if powered with a portable or in-plant
generating system.
POWER MIG 255
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