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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,564
I agree with previous posters. Back-purging (which we call "root-gas") has been done since beggining of time. When I had headers made it was done by just taping the rubber hose into the pipe and turning up the Argon so it purged air from tubes. There is nothing special about it.

AMS sure makes some pretty welds but I personally don't care about the looks as long as geometry inside the tubing is right. Some of welds look very pretty...almost as he just fused the pipes together.

But yeah...AMS are probably good. It's just that I don't understand the marketing of back-purge as something inventive and theirs. Do it without and inside of weld will be full of swampy molten droplets.
Thank you for your time,
Old 12-19-2007, 07:43 AM
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