Lincoln Electric SQUARE WAVE IM467-B Operator's Manual page 21

B-6
6. PEAK CURRENT CONTROL
Presets the maximum welding current the
machine will produce, from 2 through 400 amps.
The preset current is displayed on the digital
ammeter when you are not welding.
NOTE: The ammeter display is an indicator of the
preset current. Actual welding current will be
slightly different.
If you use an Amptrol, it will control the current
from 2 amps up to the current preset by the Peak
Current control. See the section, "Hand and Foot
Amptrol Operation" for proper use of hand and
foot Amptrols.
If pulsing, the peak current is the current set and
controlled by the Peak Current control (Item 6) and
the Amptrol.
7. VOLTS/AMPS SWITCH
A two-position, spring-loaded toggle switch for
selecting either arc voltage or welding current/pre-
set current to be displayed on the digital meter.
To read the arc voltage, you must hold the switch
in the "Volts" position. This spring-loaded switch
always returns to the "AMPS" position when
released.
8. AC WAVE BALANCE
This control is active only in AC TIG mode. It con-
trols the amounts of positive and negative current
in the AC output. It has no effect on stick or DC
TIG welding.
AUTO BALANCE ™ : This setting provides automat-
ic adjustment of the AC wave balance, and it is the
preferred balance setting for most welding condi-
tions. This setting gives the ideal amount of clean-
ing and penetration, based on the welding current
output. When the control is set to the Auto
Balance position, the Auto Balance LED (Item 9)
will light. This feature operates only in the AC TIG
mode.
For those procedures when manual adjustment of
the Wave Balance control is necessary, use the
following as a guide:
BALANCED: The amounts of positive and negative
are the same.
CLEANING (Below "3" on the dial): Provides more
positive current than negative current. Since the
positive current produces the "cleaning" or oxide
removal on aluminum, this setting is used for
heavily oxidized aluminum.
OPERATION
.
Use only the amount of "cleaning" required. Greater
amounts of positive current will heat the tungsten
more and possibly cause it to melt or "spit." Also, the
arc is usually more flared and less stable with more
positive "cleaning" current.
PENETRATION (Above "3" on the dial): Provides
more negative current than positive current. The
"cleaning" effect will be reduced, but the arc plas-
ma will be more concentrated and more easily
directed to where the heat is needed.
reduced amount of positive current allows the
tungsten to run cooler at a given current than
when set balanced.
In general, use just enough "cleaning" to remove
oxides and to give good wetting of the puddle.
9. AUTO BALANCE
Illuminates only when the Auto Balance function is
active. The welder must be in the AC TIG mode,
with the AC Wave Balance control fully clockwise.
10. AFTERFLOW
This control adjusts the amount of time the gas
and water valves stay open after the end of a weld.
Minimum time is approximately 5 seconds; maxi-
mum is approximately 55 seconds. Use enough
Afterflow time to protect the hot tungsten with gas
shielding until it cools. Too short of a time will
cause the tungsten to oxidize and become conta-
minated. When in doubt, set a longer time, then
reduce it to a time that still gives good protection.
PREFLOW
All machines have an adjustable Preflow time.
If a new weld is started during the Afterflow time of
a previous weld, the Preflow time is bypassed,
since gas shielding is already present. This allows
new welds to start immediately, with no preflow
delay.
11. ARC FORCE
This control is active only in Stick mode. It con-
trols the amount of current added to the welding
current when the electrode shorts to the work.
At Minimum, no extra short circuit current is
added.
spatter but may be more prone to sticking.
SQUARE WAVE TIG 355
CAUTION
™ LED
The arc will be softer and will have less
B-6
The