Any opinions on this "home made" backpurging method?

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I found this in the Fabrication section of the HomeMadeTurbo forum.  What do you guys think about it?   Thanks in advance.http://www.homemadeturbo.com/forum/i...?topic=76877.0
Reply:Seeem ok, apparently it worked to protect the ID penetration.Could be an improvement to have a separate flow meters, one for the purge line and one for the welder, I did''t see any flow meter, only a pressure regulator.If that was not an open root joint, you would need a small vent hole in one of the caps.
Reply:That looks like an excellent idea. I like the "Tee" joint attached to the regulatos. That means that the argon is regulated at the same SCFH as the torch. Then, using the valve, you can minimize the usage of argon to the amount necessary. It doesn't take very much argon to exclude oxygen and preclude "sugaring". Nice idea. i will have to try it.Miller Millermatic 252Miller Syncrowave 200Liincoln AC-DC 225Victor O-A Set
Reply:My god! Did you see post #12 on that thread?A man who can't weld is as poorly educated as a woman who can't sew
Reply:Originally Posted by woofMy god! Did you see post #12 on that thread?
Reply:Originally Posted by woofMy god! Did you see post #12 on that thread?
Reply:I must be new. I had no clue as to what backpurging is. It appears that the idea is to support the back of the beat with argon so it doesn't seap into the space with such a wide gap between workpieces?Let me know if I'm close.Wayne
Reply:Not quite. It is to protect the back side from oxidation. You don't want to build up any pressure, or your weld metal will get blown out as you close the root.The mechanical support for the back is surface tension.
Reply:Thanks...ahh, another no namer LOLThanks enlpck, that completely cleared that up. Very interesting concept.Thanks again,Wayne
Reply:Originally Posted by woofMy god! Did you see post #12 on that thread?