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GENERAL INFORMATION
SPREADARC
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PRODUCT DESCRIPTION
General Physical Description
The K278-1 Spreadarc has been designed to oscillate
an Automatic welding head across the line of travel
when welding long seams. The welding head and noz-
zle are mounted to the Spreadarc carriage. The
Spreadarc is then mounted to either a stationary head
mount or travel carriage. The Spreadarc is compatible
with all Lincoln Electric welding heads including the
NA-3, NA-4, NA-5, and Power Feed-10S. The
Spreadarc is often used in conjunction with the TC-3
Travel Carriage and Vertical Lift Adjuster.
General Functional Description
The Spreadarc produces a linear oscillation of the
head and nozzle. A 24 VDC right-angle gear motor
drives the carriage onto which wire drive is mounted,
accommodating a 70-pound maximum load. The mov-
ing carriage is supported on a top and bottom "V"
track by four double row bearings, two on the top and
two on the bottom. The carriage motion is produced
by a pinion driving a rack that is mounted on the mov-
ing carriage support.
Proximity switches control the length of travel. The
proximity switches remain stationary and stops mount-
ed to the moving carriage can be easily adjusted to
control travel distance. Both left and right extremes
are adjustable.
The operator can set the oscillation travel speed and
dwell times at either end of the stroke to provide
smoother bead edges. Additionally, the Jog Mode
allows the operator to position the welding nozzle in
the correct starting location for a particular weld seam.
These values are set through a digital control panel on
the front of the machine.
The oscillator uses bright digital displays and LED’s,
toggle switches, and heavy-duty push button designed
for every-day industrial use.
Advantages of the Spreadarc are:
Arc length remains constant during oscillation to pro-
vide more uniform penetration.
Dwell timers provide periods at the end-points of the
stroke for smoother bead edges.
The travel speed of the arc is uniform across the
bead.
RECOMMENDED PROCESSES AND
EQUIPMENT
RECOMMENDED PROCESSES
• The Spreadarc is compatible with all Lincoln Electric
welding heads including the NA-3, NA-4, NA-5, and
PF-10S.
• The Spreadarc can be used with submerged arc
(SAW), flux-cored (FCAW) and solid wire MIG
(GMAW) applications.
EQUIPMENT LIMITATIONS
• The Spreadarc cannot be used with a K96 horizon-
tal head adjuster.
• The Spreadarc requires 42Vac input.
DESIGN FEATURES
• Compatible with NA-3, NA-4, NA-5, and PF-10S
Automatic Heads.
• Load capacity – 70 pounds.
• Oscillation Speed – 10-150 inches per minute.
• Dwell Time (Left/Right) – 0.0-4.0 seconds.
• Jog feature for positioning nozzle before welding
procedure begins.
• Rugged 24VDC Right-Angle gear motor.
• Bright, Digital Displays and LED’s.
• Heavy-duty push button.
• Proximity Sensors for adjustable sweep distance.
