B-13
OPERATION
B-13
PRECISION TIG 275
FIGURE B.6
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Max. to Min.
Amptrol
Min. to Max.
Amptrol
Setup for TIG Amptrol Welding
Advanced Panel
(If used)
Standard Controls
Power Switch
ON
Polarity Switch
AC
or
DC
-
Mode Switch
TIG
AC Balance
AUTO
or
Set:
More +
for alum. oxide “Cleaning“
w/o “spitting”or“wetting“ loss.
Balanced for equal + and - current.
More -
for higher “Penetration“.
Local/Remote
Switch
REMOTE
Trigger Switch
2-STEP
Pulse Switch
ON
or
OFF
Pulse Frequency
4-6 pps
is a typical initial setting.
Set for bead shape and travel speed:
Higher for thinner plate and faster travel.
Lower for thicker plate and slower travel.
% On Time
40-60%
is a typical initial setting.
Set for total heat of Peak current:
Lower reduces distortion and burn-thru.
Background Current
40-60%
is a typical initial setting.
Set as low as will maintain a pulse arc
(Will not drop below Min.Output setting.)
Downslope
ZERO
For no arc-out delay.
Minimum Output
Press Display switch
and Set to desired min.
Amptrol (Start/Crater)
output level.
Postflow
Set as low as required.
Higher for larger
tungsten and current.
Maximum Output
Set to desired max.
Amptrol output level.
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Controls
SETUP GUIDELINES FOR TIG WELDING
WITH AN AMPTROL
Both the Hand and Foot
Amptrols
work in a similar
manner. They are meant to be used for remote current
control for TIG welding using the machineʼs
2-Step
trig-
ger mode (See Item 12).
The Amptrol is capable of controlling the output of the
Precision TIG over the range between the level preset
by the
Minimum Output
control when the Amptrol is at
its inactivated state, and the level preset by the
Maximum Output
control when the Amptrol is at fully-
activated state.
It is important to note that even with the Precision TIGʼs
new
MicroStart
TM
Technology, some tungsten may be
difficult to start at the low (2 amps) minimum rating of
the machine. Rather than guessing where to depress
the Amptrol to start the arc reliably, the
Minimum
Output
control allows presetting the exact level, so reli-
able starts, as well as minimum crater-fill levels, can be
consistently obtained at the minimum Amptrol (inacti-
vated ) state. FIGURE B.6 shows Precision TIG setup
for TIG welding with an Amptrol.
