WELDTECH WT200MP, Operating Instructions Manual

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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 flow 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-
cific 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 affected 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 effect 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 effect can also
be used to fine tune the arc to produce less splatter.
Wire speed, wire size and type, shielding gas will all
change the effect 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 effect 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 effect 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 off. 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 sufficiently and overload indicator lamp
goes out. Also may activate with inverter circuit fail-
ure issues.