18
DC HF TIG Operation with KUMJR200AC/DC
HF (high frequency) ignition allows the arc to be started in Tig welding without touching the tungsten to the
work piece. By pressing the torch switch the machine will activate the gas flow and the HF ignition result-
ing in the arc igniting across the gap between the tungsten electrode and the work piece. The distance
between the electrode and the work piece can be up to 5mm. This arc ignition method prevents tungsten
inclusion in the work piece, promotes longer tungsten life and offers better operator control over the starting
and stopping the arc.
(1) Assemble the front end torch parts use the correct size and type of tungsten electrode for the job,
the tungsten electrode requires a sharpened point for DC welding.
(2) Choose 2T or 4T trigger function preferred as per the descriptions below
2T Selection provides 2 times function of the torch switch.
(1) Pressing the torch switch gives arc ignition and initializes the welding current and the welding
current is maintained by the torch remaining on.
(2) Releasing the torch switch stops the welding by introducing down slope and the current falls to
minimum level and then terminates the welding current and introduces the post flow gas.
4T Selection provides 4 times function of the torch switch
(1) Pressing the torch switch gives arc ignition and initializes the welding current
(2) Releasing the torch switch continues the welding operation.
(3) Pressing the torch switch and holding introduces down slope and current falls to minimum current.
(4) Releasing the torch switch terminates the welding operation and introduces the post flow gas.
(3) Choose the preferred welding current (amperage) to suit the tungsten size material type and
thickness to be welded.
(4) Lay the outside edge of the Gas Cup on the work piece with the Tungsten Electrode 1- 3mm from the
work piece this method will provide a clean positive arc ignition.
(5) Press the torch switch and the arc will ignite across the gap between the tungsten and work piece.
Hold even distance of about 2mm gap between the tungsten and work piece to maintain the arc.
(6) Release the torch switch to bring in the end of the welding sequence dependant of 2T or 4T trigger
function choice.
(1) Assemble the front end torch parts use the
correct size and type of tungsten electrode
for the job, the tungsten electrode requires
a sharpened point for DC welding
(2) Select 2T or 4T trigger function as required
(3) Set the Peak Current (amps) to suit the
tungsten size material type and thickness
to be welded.
(4) Lay the outside edge of the Gas Cup on
the work piece with the Tungsten Electrode
1- 3mm from the work piece
(5) Press the torch switch and the arc will ignite
across the gap between the tungsten and
work piece. Hold even distance of about
2mm gap between the tungsten and work
piece to maintain the arc.
(6) Release the torch switch to bring in the end
of the welding sequence dependant of 2T
or 4T trigger function choice
