Kemppi MASTERTIG AC/DC 2000 Operation Instructions Manual - page 16
16 – Mastertig AC/DC 2000, 2500, 2500W, 3500W/0510
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3.4.4. Use and selection of operation of the torch switch
The operation of the torch switch is selected by pressing the 2T/4T key.
2-function (2T) / spark ignition
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
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.
The down-slope time of the welding current can be interrupted by quickly
pressing the torch switch.
You can go back to the welding current from the down-slope current by
pressing the torch switch down. After that, the current will rise at a rate
corresponding to the down-slope time.
4-function (4T) / spark ignition
1. Press the torch switch down. The shielding gas starts to
flow.
2. Release the torch switch. The ignition spark ignites the
arc and the current will rise to the welding level within
the up-slope time.
3. Press the torch switch down. The welding continues.
4. Release the torch switch, and the current starts to drop
and after the selected down-slope time the arc is broken.
After this, the shielding gas will flow for the time
selected.