I recently purchased a new Mig welder, a lincoln SP 175 Plus, my
question is...after welding I alway purge the shielding gas from both
the line and the regulators...to do so on this machine, the machine
must be on, I reduce the wire feed to its lowest setting ( so as to
not waste wire) and depress the gun trigger until all the gas is out
of the system, how important is it to do this as I seem to be wasting,
what appears to be, a lot of gas...maybe it is not that much gas in
total volume, but still...it is a waste...I am just programed to not
leave any pressure in the regulator...what do others do???
I, personally, me, IMHO, do the same thing on my 175 Plus. Turn the wire
speed down. Turn the gas off. Run it for about two seconds. Turn off the
machine. Back off on the regulator. I think this will extend the life and
function of the regulator, and everything involved. I may be wrong, but it
does a couple of things for me. One, if it does help the machinery, it will
help it last longer. Second, it gives me a ritual so that I don't go out
and find that all the gas has run out. (which has happened a couple of
times while learning this ritual) I think it is better not to leave
pressure on the gauge, not hit it with high side gas with the regulator open
when you crank it on the next time.
It's your machine. Treat it any way you want. You don't have to ask if you
can baby it or treat it in any special way.
Most guys just ride it hard and put it away wet ................ and then
wonder why it has a problem.
Don't worry about bleeding the unit. Just shut the tank valve off. If you
had a hundred feet of hose feeding into a confined space then bleeding the
line to the atmosphere might be a consideration.
Electric solenoid valves on wire feed welders never are a perfect seal.
The better ones take over eight hours to blead down the pressure.
It's your machine, do as you wish. I personally like to go through a ritual
each time. Well, not a ritual, but steps. That way, I know I turned it
off, and it doesn't pop into my head when I am trying to go to sleep, and
have to go out to the garage and make sure. When I leave the work area, I
am CERTAIN everything is secured and as I want it. When I fire it up again,
I know the steps I need to do to get it going again.
I used to fuss about people who had to have " a place for everything and
everything in its place. " You see, I am a Messy Marvin type. So, one day,
I asked my union electrician, who is anal about his tools/toolbox about it.
He said it wasn't so much that he had to have everything in its place, but
much more so that when he needed it the next time, he could go right to it
instead of losing half an hour looking. Then the light bulb came on for me.
I am better. Still messy, but better. I have lost whole tanks of gasses,
left equipment running overnight, and done some things I would have fired an
employee for doing. In this hobby/craft, there can be some serious
consequences to some seemingly innocuous actions.
So, I like to dry mine out before I put it away.
YMM (and probably does) V
All that is required is to close the shielding gas cylinder valve.
Many shielding gas regulators are sold that require wrench to adjust
pressure so backing off regulator isn't required to protect regulator,
gages or welder. Protect regulator and gages from pressure surges by
just crack open cylinder valve enough to start slight gas flow to
slowly build pressure then open valve. Regulator gages do not have
snubbers to slow pressure changes to pressure gage. Better to release
drive roll pressure then pull triger to purge pressure so no wire is
used in process.
Not talking about gas cutting /welding regulators here which should be
bleed down ofter use.
Your right the HP gage on my flow gage regulator has an orifice
snubber. I remember first seeing those lazer cut orifice snubbers in
the 70's but have never seen them used on welding gages before. Not
that I have looked for them on welding HP pressure gages in last 20