On Wed, 10 Oct 2007 10:22:14 -0700, wrote:

I was using my portable 110 v Century 135 MIG yesterday. The welder
is about 10 years old and used infrequently (last used about 3 months
ago).

The melt looked like there was no shielding gas. I upped the gas
pressure on the regualtor with no improvement. I could not hear any
gas flowing out of the end of the MIG gun (Tweeco brand). I unscrewed
the nozzle on the MIG gun and could not hear or feel any gas flow. I
shut off the valve on the bottle and pulled the trigger and the
pressure on the gage dropped immediately (leading me to think that
this is not a gas solinoid valve problem).


Should I be able to hear or notice gas flow at the end of the nozzle
or at the gas flow orifices under the nozzle? Suggestions on where/
what to troubleshoot?

Light a candle (or something similar) and point the nozzle
at it. Depending on the gas you are using it should go out,
if nothing else you should see it wavering around a bit.
Moving the nozzle around a bit farther away and such should
give you an idea of flow rate.

--
Leon Fisk
Grand Rapids MI/Zone 5b
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