EN
TIG 185 DC. Operating manual.
TIG 185 DC. Operating manual.
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6.4 MMA operation
The TIG 185 DC can be used as a MMA welding machine by fitting an
electrode holder and work return lead to the respective dinse connectors
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+
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(dependant on the type of electrodes being used. Please consult
the packaging supplied by the manufacturer for correct polarities).
When using your TIG 185 DC machine in the MMA mode, ensure that the
TIG/MMA selector switch is in the MMA position.
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6.5 TIG welding operation
The TIG 185 DC is fitted with a High Frequency (HF) start mode. The
arc will be initiated by keeping a distance of 2–4 mm between the
workpiece and the tungsten. The HF will be initiated by depressing the
contactor switch.
Once the arc is initiated, the HF will automatically turn
off.
6.1 Power
The machine is designed to operate on a 240V ± 15% input single phase
AC outlet. Ensure that there is adequate ventilation around the machine
when it is connected to the mains power supply.
6.2 Shielding gas
When working the machine in the TIG mode of welding the process
requires a shielding gas. The shielding gas can be supplied via a pressure
regulator to the machine from either a fixed installation or single
cylinder of gas.
If a cylinder of gas is used, please ensure that the cylinder is securely
fastened before starting any welding operation.
Refer to the application section for the selection of the correct shielding
gas.
6.3 TIG torch connection
The TIG 185 DC machine is rated at 200A at 60% duty cycle.
→ The torch is fitted to the machine by means of the Safe Lock dinse
back end. For DC (–) TIG operation,
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fit the torch back end to the
negative dinse connection. Similarly for DC (+),
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fit the torch back
end to the positive dinse connection.
→ The gas hose is fitted to the gas fitting (GAS)
located on the front
bottom panel of the machine.
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→ The contactor lead is fitted to the contactor control fitting marked.
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6.5.2 For DC pulse TIG welding
DC welding of thin material can further be enhanced by using the pulse
mode. When using the pulse mode for DC applications, the current will
be varied between the welding current and a pre-selected background
current. Additionally, the pulse frequency can be adjusted. By adjusting
the pulse frequency, the optimum heat input for a particular application
can be obtained.
The TIG 185 DC has two pre-selected pulse frequencies. These can be
selected by setting the pulse frequency switch
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to low frequency (2Hz)
or high frequency (200Hz). As a general rule, increasing the frequency
will increase the heat input into the plate.
6.5.3 Downslope control
The downslope of the welding current can be adjusted by adjusting the
Downslope Adjustment Control.
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By increasing the downslope control
time, it allows for better crater filling characteristics.
6.5.1 For direct current (DC) TIG welding
Select the correct size and type of non-consumable tungsten and
shielding gas for the application.
For DC– applications (most commonly used polarity) connect the TIG
torch to the negative Dinse plug connector and the work return lead to
the positive dinse plug connector.
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+
-
+
GTAW with DCEN produces deep penetration because it concentrates the heat in
the joint area. No cleaning action occurs with this. The heat generated by the arc
using this polarity occurs in the work thus a smaller electrode can be used as well
as a smaller gas cup and gas flow. The more concentrated arc allows for faster travel
speeds.
For DC+ applications connect the TIG torch to the positive dinse plug
connector and the work return lead to the negative dinse plug connector.
In this mode most of the heat is generated within the non-consumable
tungsten and the heat input into the plate is reduced resulting in lower
penetration depths. Larger tungstens are normally selected for this
application.
Ensure that the MMA/TIG selector switch is in the TIG position.
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6. TIG 185 DC operation.
