OPERATION
Welding Setup
The following data is intended as a starting point in arriving at the proper adjust-
ment of the system for welding an aluminum joint. It is important to understand that
the final adjustment for a particular joint may vary considerably from this data de-
pending on weld position, fit up material thickness, fillet size, etc.
Set the voltage control on the welder at the applicable voltage setting:
1.
GUN
WIRE SIZE
VOLTAGE SETTING
23 Volts
SP-9
3/64 Inch
28 Volts
1/16-Inch
SP-9
20 volts
SP-10
0.030-Inch
The open circuit voltage is usually about one to two volts
NOTE :
higher per 100 amperes of welding current than the arc voltage.
2. Loosen the pressure screw (12) and release the swing arm (10) to move the idler
roll out of position. Taking care not to touch the work piece with wire, squeeze
and hold the weld trigger; at the same time, adjust the gas regulator to give the
required gas flow. As a starting point, adjust the gas flow to 35 cubic feet/hr.
An increase or decrease may be required after welding conditions have been estab-
lished. Reclose the swing arm and readjust the pressure screw.
3.
Adjust the position of wire so that the free end protrudes 1/2-inch to 3/4-inch
beyond the end of the nozzle.
4.
Turn the electrode feed speed control to the maximum setting.
5. With the electrode near the work, but not touching, lower the head shield, squeeze
the trigger, and bring the electrode into contact.with the work piece to strike an
arc.
6.
Reduce the electrode feed speed control setting until the stubbing ceases and the
crackling sound of the arc just disappears. When the setting of the electrode
feed speed control is increased, the weld current is increased.
To stop the weld, release the trigger and draw the welding gun away from the work.
7.
Do NOT whip the gun away from the work without first releasing the trigger to
TO BREAK the arc. Failure to observe this precaution may result in:
Loss of the gas shield before the weld pool freezes, causing
a.
porosity.
b.
Too much wire will extend from the nozzle at the end of the
weld requiring a clipping operation before the next weld.
Extremely high transient voltages can develop which may damage
c.
the motor.