Tig Welding - Kemppi MasterTig ACDC 3500W Operating Manual

3.4 TIG welding

3.4.1 Selection of TIG welding and type of current
Press the selection key next to the selected TIG method,
spark TIG (TIG HF) or contact TIG (TIG CONTACT), and the
signal light next to the key will show the method. You can
change the type of current by pressing the selection key
again. (If you want to select DC+ as the current type for
TIG, press both TIG keys at the same time.)
3.4.2 Spark ignition
Note! Use contact ignition when you are welding
in a environment where there are sensitive electronic
equipements. The ignition spark can cause interferences in
equipement near the welding machine.
The arc is ignited with a high-frequency, high-voltage
spark without touching the work piece. If the arc is not
ignited in spite of the spark within one second, you
will have to try the ignition again by pressing the torch
switch. In some cases the spark ignition works better
if you touch the work piece with the gas nozzle lightly
before the ignition.
3.4.3 Contact ignition
Press the electrode lightly against the work piece (1).
Press the switch and the shielding gas will start to flow
and a small current will pass through the electrode. Lift
the electrode away from the work piece by turning it so
that gas nozzle rests against the work piece (2 ja 3), and
the arc will ignite and the current will rise to the welding
level within the up-slope time (4).
3.4.4 Use and selection of operation of the torch switch
4T
2T
4T
/
2T
The operation of the torch switch is selected by pressing
the 2T/4T key.
2-function (2T) / spark ignition
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2
1. Press the torch switch. The gas starts to flow and after
the pre-gas time selected, the arc is ignited and
the current rises to the welding level within the
selected up-slope time.
2. Release the torch switch, and the welding current
will drop in accordance with the selected down-
slope time. After the arc is turned off, the gas will
continue to flow for the post-gas time.
2-function (2T) / contact ignition
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2
1. Press the tip of the torch lightly against the work piece.
2. Press down the torch switch.
3. Lift the electrode slowly away from the work piece.
The arc will ignite and the welding current will rise
to the welding level within the selected up-slope
time.
4. Release the torch switch, and the welding current will
drop in accordance with the selected down-slope
time. After the arc is turned off, the shielding gas
will continue to flow for the post-gas time.
MasterTig ACDC 3500W
2
4
R01