Soham Impex SI-TIG-300, Operating Manual

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9. 2T/4T, remote foot pedal and torch amp control selector: 2/4 Step trigger mode switch
–
Tig
welding can either be done in 2 or 4 step mode. When the trigger mode is in the 2 step position the
following sequence will occur
Press and hold the Tig torch switch to start sequence. The machine will open gas valve to start
flow of shield gas, after the set pre-flow time to purge air from torch hose the welding output of machine
will be turned on and the arc will be started. After the arc is started the output current will increase from
the start (min) current to base (main) current in time selected by slope-up. Release the Tig torch switch
to end sequence. The machine will now decrease output to finish (min) current in time set by slope-
down, once at finish (min) current the machine will stop output and the gas valve will continue to
operate for the selected time (post flow) Possible variations of this standard sequence are shown in
diagram below. It is possible to press and hold Tig torch switch a second time during down slope time
to restart. After the switch is pressed the output current will raise to base (main) current
When the trigger mode is in the 4 step position the following sequence will occur