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® electrodes:
•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.
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®or 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® cored electrode.
.062 through 5/64 lnnershield® cored electrode.
Rated wire speed range:
80 through 980 inches per minute.
