Tiger Folks,
I am trying to repair my Tiger and have a need for a
small TIG setup. I don't care to spend over $1000 for a regular
setup. I have modified my MIG with a tungsten electrode mounted
in a drilled out wire feed tip. It works (after changing polarity); but
I need a high voltage to start the arc. Touching the tungsten
electrode to the steel messes up the electrode. I need a spark to occur
from the electrode to the steel at startup without touching the electrode
to the steel. I have attempted to build a high voltage setup, but no luck yet.
The DC impedance of my MIG is 20 ohms to ground ( with power off)
and it puts out 20 volts open circuit. When I put a 15kHz. high voltage on
the circuit, the voltage is killed by the low impedance. All the isolation
filters I can think of are either too big or they can not take the current
during welding.
I have been unable to get any information on the details of a
commerical high voltage circuit for a TIG. I called the FCC to
try to find out the legal frequency high voltage frequency, but they
said that they could only look up frequiences if I gave them the call
sign numbers. Stupid! I have also searched the internet with no luck.
If any of you Tiger owners have info on a high voltage RF start up
circuit for a TIG I could use the info.
Jim Barrett Tiger II 351C and others
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