4. Place Weld Start-Stop switch in "Start" position. Power
supply contactor is automatically energized and weld
commences.
5. With start of welding current, carriage starts, and wire
retracts at inch speed creating an arc.
6. After arc is established, the wire is fed in the forward
direction at weld speed required to properly maintain
the selected arc voltage.
7. To end the weld, the Weld Start-Stop switch is placed
in the "Stop" position. Wire feed will cease, and the
contractor and carriage travel will continue for the de-
sired anti-stick time. (To adjust the length of time for
the anti-stick, refer to Section II-A-9).
D. SUB-ARC RETRACT START - C. C. MODE
In this mode the wire is in contact with the workpiece
before the Start key is operational. After the wire is en-
ergized, and the current detector detects short circuit
current, the motor will reserve and the wire will retract at
inch speed. As soon as the wire separates from the
workpiece, and arc voltage and current and detected,
the motor will change direction to forward and feed wire
at preset weld speed.
V. OPERATION
In each of the starting methods to be considered, it will
be assumed that the unit has been properly installed,
wire placed on reel and fed through sub-arc nozzle, and
checked to insure proper operation and that fuses are
of the proper values. In no case should fuses of larger
capacity be substituted. If sub-arc welding, fill the hop-
per with welding composition.
The following is a description of the procedures to be
followed in making starts.
IMPORTANT NOTE: When using any of the procedures,
make sure that the Weld Start-Stop
Switch is in the "Stop" position be-
fore the Main Line Switch is moved
to "ON" position to energize the
control.
A. SUB-ARC SCRATCH STARTING SEQUENCE
1. Provide flux cover of weld zone.
2. Place Carriage Auto-Manual switch in "Manual", Car-
riage will move in direction of weld.
3. Place Weld Start-Stop switch in "Start" position.
Welding wire will begin slow inch down through flux
burden; when the wire touches the plate and an arc
is established, wire speed is transferred to the main
control potentiometer and the weld is in progress.
4. Place Carriage Auto-Manual switch in "Auto" posi-
tion if automatic stoppage of the carriage is required.
5. To stop weld, place Weld Start-Stop switch into the
"Stop" position.
B. POSITIONED STARTING SEQUENCE
(without touch-work kit installed)
1. Wedge a tightly rolled ball of steel wool about 3/8-in.
in diameter between the welding wire and the
workpiece, and cover the weld zone with flux. Place
the Carriage Auto-Manual switch in "Auto" position.
2. Place Weld Start-Stop switch in "Start" position. The
power supply contactor comes in immediately, initiat-
ing the welding action and carriage travel.
3. To stop the welding action, place Weld Start-Stop
switch in "Stop" position.
C. TOUCH WORK STARTING SEQUENCE (optional
accessory)
1. Place Carriage Auto-Manual in "Auto" Carriage will
start and stop with welding action.
2. Place Inch Up-Down in "Down" position. Wire will
inch toward work and automatically stop when con-
tact is made, at which time the touch work light will be
energized.
3. Place flux over weld zone, leaving Weld Start-Stop
switch in "Stop" position.
