Everlast POWER i-MIG 253DP Operator's Manual page 43

Section 2
ing acceptance and gaining wider understand-
ing. As more Pulse MIGs are employed, even
term standardization has begun as training
programs are being instituted throughout the
industry to reflect market changes in welding
procedures.
Everlast's Synergic Pulse MIG Design. Pulse is,
in the simplest of terms a cycling of a welder
between two different set levels of power,
one at a high value (Pulse Peak) and one at a
lower value (Pulse Base) setting. Everlast's
approach to pulse MIG design is similar to oth-
er brands and models of pulse MIG welders.
Although similar, it is a bit different as well in
the fact that more effort has been made to
simplify the nomenclature associated with the
unit's controls. We have also tried to simplify
operator input without compromising the ba-
sics of Synergic operation. In Synergic Single
Pulse MIG mode, the Power i-MIG 253DPi can
be compared to other types of Synergic single-
Pulse MIG welders in the fact that the pulse
wave shape is considered "simple" because it
is pulsing between two defined values that are
optimized by the unit's programming.
The Power i-MIG 253DPi features both single
and double pulse modes. As previously stated,
during the pulse MIG process (single or dou-
ble) there are two alternating "values" that are
being pulsed. Depending upon the weld pro-
cess type, this "value" can Pulse either Volts or
Volts and Amps together. In the single pulse
mode the welder pulses between two differ-
ent Volt levels. In double pulse MIG, it pulses
between two alternating layers of single pulse,
which include separate settings for Amps and
Volts. For comparison, a TIG welder operating
in Pulse Mode pulses Amps only. By pulsing
voltage, you are managing heat by creating an
Setup Guide and component Identification
PULSE MIG OPERATION
arc that preserves the best characteristics of
the lower voltage values and of the higher
voltage values with a lower overall heat input.
Voltage, as used in the MIG welding process,
controls the arc length, which in turn controls
arc cone diameter. A wider arc cone will cre-
ate the impression of a "hotter" weld as the
wire is burning back to a more distant height
from the weld puddle. A higher voltage will
also allow the metal to flow more readily (wet-
in), leading to a wider, flatter bead. But volt-
age set too high can also be a contributor to
spatter, burn through and arc instability. A
lower voltage value can help control burn-
through wet-in, and can prevent too wide of a
weld bead. But if the voltage is too low the
bead profile may be too narrow and too high
(often referred to as a ropy weld).
As you use the Everlast welder in pulse mode,
the average voltage value is roughly between
the two voltage values selected by the pro-
gramming. The idea is to gain the arc control
provided by the lower voltage while gaining
the wet-in. property and speed of the higher
voltage. This is further fine tuned via the use
of Voltage Offset (Trim) control. Keep in mind
though, you are not directly setting the inde-
pendent Peak and Base Voltage with this con-
trol. You are only setting a relative value of –5
to +5. The welder automatically selects the
Peak and Base voltage based off your selection
and input of wire diameter and wire type
(alloy/metal selection), and metal thickness
(Amps).
This also simultaneously optimizes the speed
at which the pulse operates (frequency). Fre-
quency (Hz) yields the added bonus of more a
directable arc and a more desirable bead pro-
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