12
5.
Gas post flow adjustment
Adjustable from 1 – 10 seconds. The gas keeps flowing after weld has finished, this cools &
stops tungsten from getting contaminated. Note: Gas pre-flow time is fixed at 0.5 seconds
in TIG mode but no pre-flow time will occur if the arc is restarted during post flow time as
gas is already flowing.
6.
MMA-TIG mode switch.
Switches between TIG (GTAW) & MMA STICK (SMAW) welding.
7.
Pulse On/Off switch
This turns the pulse welding on and off.
8.
2/4 Way selector switch
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 a 0.5 seconds 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
