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25
continued - Set up and operation for AC TIG Welding - KUMJR200AC/DC
AC (alternating current) enables us to TIG weld non ferrous alloys like Aluminium, Aluminium Alloys and
Magnesium. These materials have an insulating surface oxide layer that melts at a higher temperature than

is ideal because the nature of the AC wave form assists in breaking the surface oxide layer. HF arc
ignition provides easy and precise starting of the arc, see page 18 &19 for HF start explanation.
(9) Assemble the front end torch parts using the correct size and type of tungsten electrode for the job.
(10) 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
 
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.
 
 
(11) Choose the preferred welding current (amperage) to suit the tungsten size material type and
thickness to be welded.
(12)
(13)
work piece this method will provide a clean positive arc ignition.
(14) 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.
(9) Assemble the front end torch parts usimg
thecorrect size and type of tungsten electrode
for the job, the tungsten electrode does not
require a sharpened point for AC welding
(10) Select 2T or 4T trigger function as required (11) Set the Peak Current (amps) to suit the
tungsten size material type and thickness
to be welded.
(13) Lay the outside edge of the Gas Cup on
the work piece with the Tungsten
 
(14) 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.
(12) 
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