For those of you TIG welding tubing with an back purge: How do you set up the purge gas flow? Do you use a dual flowmeter, with one line going to the TIG torch and the other feeding the purge? Or do you run the purge from a "Y" off the main feed to the torch (with the "Y" hooked up after the gas flow solenoid)?
The former method has the advantage of being able to regulate the CFH of the torch and purge feeds separately. However, if you forget to shut off the purge when you're done welding, you'll use up a tank of gas pretty quickly. Or is this something you don't forget after you've done it once or twice!
The latter set up forces the purge feed to run at the same CFH as the torch, but the purge will stop and start automatically with the torch feed.
Suggestions welcome - thanks.