Pulse Tig Operation - Everlast PowerMTS 251Si Operator's Manual

Section 3
TIG Pulse. The TIG pulse creates two amp
values, a high and a low value that cycle back
and forth between each other while welding.
The upper amperage is called the "TIG Pulse
Amps" (sometimes referred to as "Peak" cur-
rent.) The lower amperage is called "TIG
Pulse Base Amps " (sometimes called
"background" or "base" current). This cre-
ates a situation where penetration can be
achieved without overheating the metal, par-
ticularly on metals that are prone to structur-
al deterioration or burn through. In effect
you are creating an average of amps. Note
that this is different from MIG Pulse. MIG
pulse pulses between two Volt values, not
Amps like TIG Pulse does. This welder fea-
tures three adjustable parameters concern-
ing the TIG pulse:
1. Peak and Base Pulse Amps. Both (Peak)
Pulse Amps and Base pulse amps are in-
dependently set. When selecting the
Pulse Mode, the welder will bypass the
standard TIG Amps LED and will default
to the Peak Pulse Amps LED instead.
When you adjust the base Amps, you are
actually setting a ratio of Amps. Base
amps are expressed as a percentage of
TIG Pulse (Peak) Amps. So, when you set
base amps, you are only setting it as a
percentage, not the actual Amps. As you
increase Peak Pulse Amperage, the pulse
will maintain the same ratio of Amps you
have selected, raising the base Amps au-
tomatically. To adjust the base Amps to
a desired setting, using an example of
100 Peak Pulse Amps, setting the base
Amps to 50% yield s a 50 Amp value for
the pulse base Amps. The foot pedal will
control both Peak and Base Pulse Amps
together, according to the percent of

Pulse TIG Operation

100
50
100
50
100
25
59
Basic Theory and Function
EXAMPLE 1
Peak Pulse Amps: 100 amps,
Base Amps: 50%
Pulse Time On: 50%
AMPS
DC Pulse Frequency: 1 Hz
Pulse Time ON
Pulse Hz
2 S
1 S
EXAMPLE 2
Peak Pulse Amps: 100 amps
AMPS
Base Amps: 50%
Pulse Time On : 50%
DC Pulse Frequency: 25Hz
EXAMPLE 3
Peak Pulse Amps: 100 amps
AMPS
Base Amps: 25%
Pulse Time On: 75%
DC Pulse Frequency: 3 Hz
base Amps selected on the panel.
2. Pulse Frequency. Pulse speed or fre-
quency as it is referred to is measured in
the standard unit "Hertz." Simply, it is
the number of pulses per second that
occur. Pulse frequency controls the arc
constriction and also helps with heat
management.
3. Pulse Time On (Balance). Pulse Balance
Welding Amps
Pulse Amps
DC
3 S
DC
1 S
DC
1 S