10
3.1
General Description, Purpose and Features.
PowerARC 140 ST:
The PowerARC 140ST is a compact inverter welder
that provides DC stick and DC TIG welding capability.
The welder is ideal for welding tasks where portability
and performance are required. With 120V/240V capa-
bility, the unit can be operated almost anywhere a
power outlet is found, and can be used with small
clean powered generators. (USA/Canada models)
In stick mode the arc is smooth and stable. The auto-
matic hot start in stick mode reduces rod sticking
while striking an arc by providing a controlled surge of
amps. Similarly, the auto arc force control adapts to
the arc length and provides extra current to the arc
when the arc length is shortened and voltage begins to
fall. This prevents the arc from extinguishing and
helps to improve overall arc performance in out of
position welds. The welder is suitable for welding with
iron powder, stainless and low hydrogen class rods
including 7018, 6013, 7014, and 309). It also is able to
perform well with 6011.
NOTE: This unit is not designed to weld with 6010.
Additionally the unit is equipped with a lift start TIG
function and is excellent for almost DC TIG application
requiring less than 140 amps (240V). The lift start
function provided in the TIG mode provides a clean,
interference free start for electronically sensitive areas
where High Frequency arc starting is restricted or pro-
hibited. (Unit does not have HF start capability.)
NOTE: This unit does not support operation with a
foot pedal, torch mounted amptrol or remote.
NOTE: This unit is DC output only. This unit is not
designed to TIG weld aluminum or magnesium. How-
ever, the unit can be used to stick weld aluminum
with specially designed aluminum stick welding elec-
trodes (rods). Flux-coated aluminum stick welding
rods are expensive and other than occasional use for
emergency repair are not generally considered a eco-
nomically viable alternative to AC TIG welding or MIG
welding aluminum. While DC+ and DC–
TIG have
both been used to weld aluminum in the past, both
have technical issues that can create problems. AC
TIG is generally considered to be far superior, and the
correct method of welding aluminum.
3.2 Basic Overview and operation.
PowerARC 140ST :
The PowerARC 140 ST package includes a basic TIG
torch with a manual gas valve, stick electrode holder
with cable, and a work clamp. The optional regulator
may be purchased from Everlast (recommended: EV
200UW) or can be sourced from other suppliers. Cus-
tomers must supply only pure argon (or a combination
of argon and Helium while operating in TIG mode.
TIG:
NOTE: This unit is not foot pedal capable.
The welder does not have a gas solenoid circuit so it
does not provide automatic flow control of the gas.
Rather it’s equipped with a manually controlled valve
mounted on the torch. See page 13. Twisting the
valve located on the neck of the torch opens and clos-
es the gas flow. This gas valve manually controls pre-
flow and postflow of shielding gas , and must be
opened before striking an arc. This is a common type
of setup found throughout the welding industry.
When using a manual gas valve setup, care must be
taken to shut the gas off each time to prevent wasting
argon.
The torch must be connected directly to the regulator
for TIG use. Most regulators come with a 5/8” CGA
fitting. Some, such as the regulator available from
Everlast, may be supplied without fittings, designed
for use with barbed fittings. You will need to join the
regulator and torch by adapting the 5/16” torch gas
hose to the regulator. This is easily accomplished with
a minimal amount of standard hose, a hose barb and
CGA fittings available at any welding supply store.
To use the TIG lift arc, flip the switch toward the TIG
icon on the welder. Ensure the torch cable is located in
the negative terminal of the welder and the work
clamp cable is located in the positive terminal. Adjust
welding current with the Amp control knob to desired
amp level. Make sure the tank is open and the regula-
tor is adjusted for 10-20 CFH (5-10 lpm). Lightly
touch the tungsten to the metal, and quickly lift up to
a distance of 1/8” or less. See page 18 for lift arc strik-
ing method.
NOTE: the tungsten will be electrically live (hot) all
the time. Do not allow it to contact the weldment or
any conductive area that is directly or indirectly in
contact with the work clamp or arc flashing and/or
injury may result. Use a protective sleeve or torch
GENERAL SETUP AND OPERATION
Section 2
Содержание POWERARC 140ST
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