OPERATION
Wire Threading (Figure 2.)
Place a spool of welding wire on the spool shaft (23) so the free end will
pay-off from the top into the rear nylon bushing (4). Loosen the wire pres-
sure thumb screw (18) and open the swing arm (15). Push the free end of the
wire through the rear nylon bushing (4), through the front nylon bushing (3),
and into the guide tube (5). With the welding set connected according to the
"Connection" instruction above and the line cord connected to a 115 V AC or DC
supply, turn the system on by throwing the "ON-OFF" switch (2 of Figure 1).
Close the swing arm (15) and tighten the adjusting screw (18) until there is
just sufficient pressure to prevent the wire from slipping when the inch switch
(17) is pushed. Too much pressure on the adjusting screw will overload the motor
and cause erratic welding action. Too little pressure will allow slippage and
cause "burn-backs" while actually welding. If the wire is threaded properly and
the adjusting nut is adjusted for the right pressure, the wire should feed free-
ly from the guide tube. Now replace the plastic spool cover (9) over the spool.
A "burn-back" is a condition where the electrode fuses or melts into the front
end of the guide tube. It is the result of improper adjustment of the welding
set, such as improper current adjustment at the power supply, improper swing arm
pressure, improper adjustment of the rheostat on the control monitor, loose
connections, welding power source, set on Straight Polarity, etc.
Welding
1.
Adjust the current control on the welder to the required output current.
To adjust the gas flow, first turn on the gas supply by turning on the main
2.
valve at the top of the gas cylinder. Being careful not to touch the wire
to the workpiece, pull the weld trigger and hold; at the same time adjust
Figure 4 to
the gas regulator by turning the flow adjustment shown on
the required gas flow. As a starting point adjust the flow to 35 cubic feet/
hour. This is indicated when the top of the ball in the flowmeter reaches
the calibration marked 35. An increase or decrease may be required after
welding conditions are established.
3.
Adjust the position of the wire to protrude 1/2 to 3/4 of an inch beyond
the end of the nozzle by pressing the inch button.
4.
Turn the rheostat knob (1) on the control monitor to maximum.
With the wire near the work, but not touching, lower the head shield, pull
5.
the weld trigger and bring the wire into contact with the workpiece. An
arc will form and the wire will begin to feed.
6.
With the wire feed speed knob on the control monitor adjusted near maximum
as described in paragraph 4, the arc will probably be too short and the wire
will stub, causing considerable spatter. Decrease the setting of the wire
feed control until the proper arc length is accomplished. This is usually
