I was tearing my hair out trying to figure out how to "back gas" when TIG welding stainless steel and titanium. After watching a few titanium welding videos on YouTube, I saw a similar setup. The good thing is that the return gas flow can be adjusted independently of the main gas flow. I did some welds on the SS motorcycle exhaust and the inside of the welds came out much better than if I had done it without backflushing.
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