11
General Description, Purpose and Features.
The Power
MTS 221STi multi
-
process unit features an industry first
MIG TIG Stick unit with AC/DC TIG output. As with Ever-
last
’
s other compact MTS units, this unit employs HF arc
starting for TIG as well as a Lift TIG arc start feature.
The TIG capability of this unit is further enhanced by a
completely adjustable pulse. In MIG mode the unit fea-
tures both standard and synergic MIG modes. Synergic
MIG is a useful feature to help simplify set
-
up and re-
duce the need for extensive operator knowledge of ide-
al volts, amps and wire speed ratios. The spool gun
capability of this unit allows the user to weld aluminum
in MIG mode. The optional Parker spool gun is perfectly
suited to this welder and is a good choice for welding
aluminum at a faster rate than AC TIG typically allows.
But when thinner gauges are required, the TIG function
offers the ability to weld aluminum down to
.023”.
The
PowerMTS 221STi also features a synergic function for
spool gun use, which is also unique for this welder, al-
lowing control of both amps and volts through one
knob. This welder does not have the traditional bulk of
an undercarriage which is normally associated with mul-
ti
-
process welders of this range of capability, helping it
retain portability. In addition, the welder can accom-
modate up to
8”
rolls of MIG wire ( up to 12 lbs. typical-
ly). Although specially designed after
-
market
4”
spool
adapters can be purchased from many after
-
market
suppliers, Everlast does supply a spool carrier that can
be reconfigured and adapted for the
4”
spools so small-
er rolls may be used in the machine. If possible, al-
ways use the larger
8”
rolls however due to concerns
with excessive cast and spiral from the small diameter
of the
4”
wire roll. As it exits the gun, it may create a
wandering arc. If
4”
rolls are typical of your pattern of
use, consider the spool gun option which is ideal for this
type application. Additionally, it is far more economical
to purchase wire in a 10 or 12 lbs. at a time than in a
small 1 or 2 lb. roll if you consider price per pound of
wire. The welder is capable of storing up to 9 programs
for rapid setup and recall of favorite settings. This fea-
ture is helpful when storing favorite pulse programs.
The unit also features a heavy
-
duty wire feeding mecha-
nism with 4 driven drive rolls for maximum wire feeding
capability. The multi
-
process aspect of this welder fea-
tures additional welding processes which include DC TIG
and Stick. The TIG process also features an industry first
for MIG/TIG/Stick welders: a fully adjustable TIG Pulse
setting, which allows the unit to pulse up to 150 times a
second between two selected amp values. The TIG pro-
cess also features High Frequency (HF) start (which is
another industry first) to allow contactless starting of
the TIG arc. The PowerMTS 221STi is the first unit in the
industry to feature out
-
the
-
front controls for TIG, which
also includes a solenoid controlled gas connection. See
below for additional summary of features:
1)
GMAW
Process (MIG).
The digitally controlled
MIG components precisely control arc functions
and give real
-
time feed back about the welding
output parameters. As already mentioned, the
welder is also spool gun (gun optional) ready for
economical welding of Stainless and Aluminum
wires if needed. The PowerMTS 221STi can also
be used with flux core and dual shield wire (when
equipped with optional flux core drive wheels.)
However, since there is no Flux
-
Core/Dual Shield
synergic setting, Flux
-
Core/Dual Shield operation
will not be optimized in synergic mode and manual
mode should be used. Although the standard gun is
competent to be used with flux core wire, a special
flux core gun may be necessary for heavy duty Flux
core (non
-
gas) use. Or a special shielded consuma-
ble can be purchased locally from suppliers of the
15 series type guns. At this time, Everlast does not
offer a flux core gun or shield for this unit. Howev-
er, many after
-
market suppliers of MIG guns do
offer special flux
-
core guns that can be equipped to
fit the popular Euro
-
Style power connector that the
PowerMTS 221STi utilizes.
2)
GTAW (TIG).
The TIG mode of the welder features
both AC and DC output which is suitable for weld-
ing all metals when required. It includes a high
frequency start and a lift start function to give the
operator maximum flexibility welding in areas that
restrict HF use. A fully adjustable AC mode with AC
wave form selection feature allows the user to
weld Aluminum and Magnesium. A fully adjustable
pulse feature is also included to help control heat
and distortion. It can also be used to improve bead
appearance. A key feature of this welder
’
s design
places all connections on the front of the panel
instead of under the spool cover. No install kits are
necessary to make the unit TIG ready. A gas sole-
noid is used to automatically control gas flow when
the arc is started and stopped according to the
time set on the panel. A foot pedal or torch switch
is used to control the TIG function. The pedal con-
trols the amps when plugged in. Similarly, the
torch switch provided with the TIG torch can be
used to control the functions on the panel se-
quencer graph. The sequencer can be used to pre-
set amp and slope parameters to work in conjunc-
tion with the torch switch. It is also used to control
other aspects of the weld parameters that may be
Section 1
Introduction and Specifications
