WELDTECH WT200MP - Quick Start Guide; Electrical Connection and Environment Setup; Welding Mode Controls and Indicators; MMA and Lift TIG Mode Controls

6
Quick Start Guide
Electrical Connection
TheWT200MPisdesignedtooperateona15A230V
AC power supply. If an extension cord must be used,
it should be a heavy duty version with a minimum
cablecoresizeof2.5mm2.Itisrecommendedtouse
theEuroquipindustrialduty15Aextensionlead,part
number16895.
Operating Environment
Adequate ventilation is required to provide proper
coolingfortheWT200MP.Ensurethatthemachine
is placed on a stable level surface where clean cool
aircaneasilyowthroughtheunit.TheWT200MP
has electrical components and control circuit boards
which may be damaged by excessive dust and dirt,
so a clean operating environment is essential.
Mig Voltage & Mig Wire Speed / MMA
& Lift Tig Current Control Knobs
MIG Welding Mode
TheMIG voltagecontrolis essentially thepower in
the welding arc that sets the heat. The wire speed
feed simply controls the rate at which the welding
wire is fed into the weld pool.
Foranyvoltagepositionsetting,therewillbeaspe-
cic corresponding ‘sweet spot’ in the wire feeding
speed that will give the smoothest and most stable
welding arc. The correct wire feeding speed for a giv-
en voltage setting is aected by welding wire type
and size, shielding gas, welding material and joint
type.
It is recommended to set the welding voltage as
desired and then slowly adjust the wire speed un-
til the arc is smooth and stable. When reaching this
point, if the penetration/ heat input is too much/
not enough, adjust the voltage setting and repeat
the process. If the operator is not able to achieve a
smooth and stable arc with the desired heat input
fortheweld,itislikelythatachangeinwiresizeand/
orshieldinggastypeisrequired(assumingallother
factorsarecorrect).
A chart with recommended settings using this ma-
chine for common welding applications is located
on the underside 0f the wire feeder cover door and
further on in this manual.
MMA/ Lift TIG Welding Mode
The current control knob sets the target welding
output current for either mode selected. The voltage
knobhasnoeectinMMAorTIGmode.
MIG Inductance Control- Inductance adjustment
controls the rate of the current rise and fall as the
welding wire contacts the workpiece (known as a
short circuit). More inductance increases the short
circuit time and decreases the short circuit frequency
rate. This causes a wider and more penetrating arc,
useful for thicker weld joints. Less inductance will
create a narrow more focused arc. This eect can also
be used to ne tune the arc to produce less splatter.
Wire speed, wire size and type, shielding gas will all
change the eect that the inductance setting has on
the welding arc. As a general rule, CO2 based shield-
ing gas will weld more smoothly with increased in-
ductance, while argon shielding gas will perform
better with less inductance. Inductance setting will
havenoeectonMIGspraytransferprocess(asop-
posedtoshortcircuitprocess),MMAorTIGwelding
process.
Lift TIG Mode
LiftTIGisanarcignitionsystemforbasicTIGwelding
that removes the need to ‘scratch’ start or strike the
tungsten on the work piece to start the arc, which
can have a negative eect on the weld quality due
totungstencontamination.Liftarcstartingworksby
gently touching the tungsten on the work piece and
then lifting it o. The control circuit will sense when
the tungsten is removed from the work piece and
send a pulse of electricity through the torch that will
causetheTIGarctoinitiate.
Overload Indicator Lamp
Lights when duty cycle is exceeded and thermal
protection is activated. When thermal protection is
activated, welding output will be disabled until ma-
chines cools suciently and overload indicator lamp
goes out. Also may activate with inverter circuit fail-
ure issues.