Section Ill. OPERATION
3.1 SAFETY REQUIREMENTS
During operation of the Control to insure proper oper -
Comply with all ventilation, fire, and other safety re-
quirements for welding as established for industrial
applications. Reference as applicable:
a. Carefully open Control door. Make sure lamp
glows when power switch is ON.
a. "Safety in Electric and Gas Welding and Cuttin
Operations", American Standards Association: Bulle-
This lamp goes out when
tin Z49.4 4958
guntrigger or wire jog is depressed.
b. Check for leaky hoses. Shut downsystem before
b. "Recommended Safe Practices for Inert-Gas
Metal-Arc Welding", American Welding Society:
making any repairs.
Bulletin A6. 1, 1958.
After operation of the Control, check for leaks and
look for signs of overheating at electrical points as
evidenced by brownish discoloration, smoke or odor.
intensity are in Aircomatic welding methods, flash
goggles (medium-shade 1306 2101) are recommended
in addition to helmet for the operator and near-by
personnel. The welding wire (electrode) and all metal
3.6 OPERATING SEQUENCE
parts in contact with it are electrically energized while
welding, requiring periodic inspection of cables for
During a system operation, the Control performs four
broken insulation, water leakage, and other electrical
sequences (Figs. 6, 7, and 8):
a. Wire jog sequence for advancing wire without
gas and water flow.
WHENEVER STEPS ARE TAKEN TO
b. Run-In Start sequence for feeding wire with gas
REMOVE AND REPAIR ELECTRI-
and water supplies.
CAL HAZARDS, PLACE ALL POW-
ER CONTROLS OFF AND DISCON-
c. Scratch-Start sequence for supplying gas and
NECT ALL ELECTRICAL CABLING
water, but feeding wire only after wire electrode is
FROM POWER SOURCES.
scratched against workpiece.
d. End of weld sequence,
The Control can only be
operated when connected
3.7 SHUTTING DOWN CONTROL
within a welding system.
This section covers only
pre-weld requirements, and
operation sequence, cali-
To shut down Control, turn power switch (Fig. 4) OFF.
bration, and checks during
and after operation.
At freezing temperatures,
purge water lines before turning off
3.3 PRE-WELD REQUIREMENTS
Before operating the Control in a welding system:
3.8 PRINCIPLES OF OPERATION
a. Turn main power switch (SW101) (Fig. 4) OFF.
b. Make sure all connections of hoses and cables
3. 8.1 PROGRAM SECTION
c . Set wire feed selector switch (SW102) in
After the gun trigger is pulled, the program section
SCRATCH-START or RUN-IN position,
receives the input power, energizes the speed control
d. Check for proper adjustment of time-delay relay.
section, and uses a time-delay relay and control relays
e. Close control door.
to sequence the weld current, wire, gas, and water
f. Turn main power switch (SW101) ON. Allow at
least a 30-second warm-up interval for equipment
When the input voltage is impressed across the sec-
pulled, control relay CR103 is energized. It oper-
ates the time-delay relay TDR101 which in turn ener-
Operation of the Control in an energized welding sys-
gizes the gas and water solenoids. The time-delay
tem is remotely controlled by the trigger or wire jog
relay also governs the time interval during which gas
on the gun.
and water flow after the gun trigger is released. This