Fig. 1 Model AH C- B Cent rol
Section I. INTRODUCTION
cooled weld current relay. This 90-pound unit oper-
ates with an input of 115 VAC, 60 cps, and its power
lines are fused at 10 amperes. Dimensions are shown
This manual covers the description, installation, op-
in Fig. 2. All interconnecting cables and hoses for
eration, maintenance, and parts replacement for the
gas and water are brought into the enclosure through
A I R C O M A T I C Control, Model AHC-B (Fig. 1),
which is used in manual Aircomatic welding.
1.2.1 CONTROL COMPONENTS
The Model AHC-B Control is an electronic panel used
in manual and semiautomatic AIRCOMATIC welding
A current relay applies welding current from the
operations to program the welding operation. It can
power source. It contains two welding cable lugs and
only be operated when connected within a system con-
a water connection gland.
taining an AIRCOMATIC welding gun, Model AHF-E
Push-Pull Wire Feeder, and a welding power source.
Three fuses protect the Control circuitry: two power
Such a system needs only two hand operations for weld-
line fuses and a 1/4 amp fuse for a full-wave rectifier
ing after the power is turned on: a pre-setting of wire
feed speed on a dial of the Wire Feeder, and a pull of
in the speed control section.
the gun trigger. The Control automatically programs
the operation by timing and sequencing the gas flow,
The weld programming section receives the input
water flow, wire feeding, and weld current. At the
power, energizes the speed control section, and uses
end of the weld, it provides dynamic motor braking,
a time-delay relay and a number of control relays.
and, with pull-type guns, an electric brake for wire-
These sequence the integrated welding steps such as
feeding weld current, wire, and gas and water flow
once the gun trigger is pulled.
The Control is a compact steel enclosure with a hinged
The speed control section electronically regulates the
It contains an electro-mechanical weld programming
motor to produce the desired wire feed rate set man-
section, an electronic speed control section, a water-
ually on the wire feed speed dial of the feeder. It