General Description; Recommended Processes And Equipment - Lincoln Electric SVM138-A Service Manual

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GENERAL DESCRIPTION

The LN-9 GMA 2-Roll and 4-Roll semiautomatic wire
feeder models feature the precise "set and forget" dig-
ital procedure control and the other welding and oper-
ator features pioneered by the original LN-9 models.
In addition, the LN-9 GMA models also have the fol-
lowing advantages for small wire gas metal arc weld-
ing with solid or flux cored Outershield
• High speed wire drive with a high torque permanent
magnet motor and tool-less "quickrelease" idle roll
pressure arms, guide tubes and gun cable fastening.
• Factory installed gas solenoid valve with gas inlet and
outlet fittings.
• Adjustable preflow, postflow and burnback timers.
Purge and cold inch switch functions are available.
• For 4-Roll models, a design which provides the addi-
tional feeding force. This is required when using gun
cables over 15 ft. long or when wire is being pulled
long distances (for example, bulk packages).
Because the 4-Roll feeder has twice the contact sur-
face, it can also help when feeding softer wires. It
delivers the same or more feeding force as the 2-Roll
with less overall wire deformation. Wire size range,
speed and features are the same as other LN-9 GMA
models.
RECOMMENDED PROCESSES AND
EQUIPMENT
The LN-9 GMA is available in four models:
K424 LN-9 GMA 2-ROLL AND K568-1 LN-9
GMA 4-ROLL
Wire feed unit and all controls completely enclosed in
a single portable enclosure. See Figure B-1.
FIGURE B.1 – BASIC LN-9 GMA HOOKUP
OPERATION
® electrodes:
K196-XXX,
LN-9 GMA Wire Feeder
K436 LN-9F GMA 2-ROLL AND K583-1
LN-9F GMA 4-ROLL
Separate wire feed unit and control box with 16 ft cable
assembly for boom or fixture mounting. See Figure
B.2.
FIGURE B.2 – BASIC LN-9F GMA HOOKUP
When combined with the broad selection of quality
welding equipment and accessories, the LN-9 GMA
provides a versatile precision welding system to meet
the specific needs of gas metal arc and Innershield
submerged arc welding processes. The capabilities of
the LN-9 GMA 2-Roll and 4-Roll are:
Rated wire size range:
.023 through 1/16 solid wire electrode.
.045 through 5/64 Outershield
.062 through 5/64 lnnershield
Rated wire speed range:
80 through 980 inches per minute.
(2.03 through 24.9 meters per minute).
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® or
® cored electrode.
® cored electrode.