I'm a new tig weldor and this may be useless info, but I thought I would pass it along for discussion or ridicule.
I read in Minnick's "GTAW Handbook" (thanks for the recommendation, Glen) that if you do a lot of short stop-and-start TIG welds, you will often get a surge of Ar when you hit the pedal because the pressure "backs up" between the solenoid gas valve in the tig machine and the regulator/flowmeter upstream.
Anyway, Minnick said that you could save a lot of gas if you do a lot of stop-and-start welds if you use a "gas surge suppressor" which would temper the surge when you first step on the pedal.
Minnick said such an item would quickly pay for itself in saved argon.
I looked high and low on the internet and didn't find anything until I found a Smith flow restrictor (you can see it on page 11 of this pdf) which (if my calculations are right) would limit flow to 35cfh at 50 psi (they say 21 cfh at 30 psi and I extrapolated from that).
(I know 35 cfh is a lot, but I have a "Y" attached to the front of the machine in case I ever want a back purge line, so 35 would give me 20 + 15...)
Most places where I see them talking about that part (Smith P/N: 15001-20) they're talking about MIG and not TIG, but I installed mine, and I swear when I step on the pedal I don't hear nearly as much of a WHOOSH as I used to. But then again, I still have 2400 psi of Ar.
I installed mine on the back of my Sync 250 but I may move it to the front and see what happens there, as well.
The part costs $13 so even if it's equivalent to a "gas line magnet that doubles your mileage by breaking down the molecules," I haven't lost that much.
FWIW and let the abuse begin.
Where to Buy
Service & Support