Everlast PowerTig 200DX-DV Operator's Manual page 23

Section 3
5. Pulse. The 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 "welding amps" (sometimes called "peak"
current) and the lower amperage is called "pulse
amps " (sometimes called "background" or
"base"current). This creates a situation where pene-
tration can be achieved without overheating the met-
al, particularly on metals that are prone to structural
deterioration or burn through. In effect you are cre-
ating an average of amps. The PowerTIG series fea-
ture three adjustable parameters concerning the
pulse:
A. Pulse Amps. Both welding amps and pulse amps
are independently set. Adjust the welding amps with
the main control knob and the pulse amps with the
pulse amp knob. However, when you adjust the pulse
amps, you are actually setting a fixed ratio of amps
expressed as a percentage of Welding Amps. When
setting Welding Amps, the welder will display actual
amp value when the pulse is turned on. However,
after about 3-5 seconds, if you do not begin adjust-
ment of the pulse amps, the meter will begin to fluc-
tuate rapidly (depending upon frequency setting),
sampling the pulse setting at odd points along the
pulse cycle. To be able to read and set the pulse after
the default setup time expires, turn the pulse frequen-
cy to the minimum setting first, then adjust the pulse
amps. (If the default time expires before you are able
to set the pulse amps, you may get a fairly accurate
reading of the pulse amperage while it is pulsing slow-
ly.) Alternatively, you can turn the pulse off and back
on to reset the default display time. The display is not
synchronized with the pulse so it samples at a set rate
that is independent of pulse changes, which yields
randomly fluctuating numbers. As you increase weld-
ing amperage, the pulse will maintain the same ratio
of amps you have selected. To adjust the pulse amps
to a desired setting using an example of 100 Welding
Amps, setting the pulse amps to 50% yield s a 50 amp
value for the pulse amps. The foot pedal will control
both Welding Amps and Pulse Amps according to the
%(Ratio) selected on the panel.
B. Pulse Frequency. Pulse speed or frequency as it is
referred to is measured in the standard unit "Hertz".
Simply, it is the number of pulses per second that oc-
cur. Pulse frequency controls the arc constriction and
also helps with heat management.
C. Pulse Time On (Balance). Pulse Balance is the per-
Basic theory and function
EXAMPLE 1
Welding Amps: 100 amps,
PulseAmps: 50%
Pulse Time On: 50%
DC Pulse Frequency: 1 Hz
AMPS
Pulse Time ON
100
50
Pulse Hz
1 S
EXAMPLE 2
Welding Amps: 100 amps
AMPS
Pulse Amps: 50%
Pulse Time On : 50%
DC Pulse Frequency: 25Hz
100
50
EXAMPLE 3
Welding Amps: 100 amps
AMPS
Pulse Amps: 25%
Pulse Time On: 75%
DC Pulse Frequency: 3 Hz
100
25
centage (%) of time that the pulse stays in the welding
amp (Peak) stage of the cycle. Increasing the Pulse
time on will increase the duration the Peak amp stage
of the cycle which in turn will increase heat and pene-
tration. Lowering the Pulse time on will decrease heat
and penetration, which in turn will result in a faster
freezing puddle.
Setting up the pulse is not a process with a fixed ad-
justment procedure. Changes to frequency, balance,
and time will skew the final result. A slow pulse with a
equal 50% pulse time on and somewhere around a
23
Welding Amps
Pulse Amps
DC
2 S 3 S
DC
1 S
DC
1 S