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Carbon Dioxide as Shield Gas for Brazing
mattmia2
Member Posts: 10,820
Is carbon dioxide effective as a shield gas to trickle in to refrigeration tubing while brazing? I can can justify buying a co2 tank and different regulator setups for carbonating and for leak testing and brazing but I can't quite justify a co2 and nitrogen setup for the different occasional uses.
Is my assumption that 99.90% pure beverage grade co2 has to be inherently dry correct?
Is my assumption that 99.90% pure beverage grade co2 has to be inherently dry correct?
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Comments
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Hi, Sometimes the right answer to a question is another question. So, my question: How about making a braze joint while purging with carbon dioxide, then cut the pipe open and see if any scale has formed? I'd be concerned about the 02 part of the gas affecting copper, but that's just a wild hypothetical guess.
Yours, Larry0 -
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I have done some braze test joints while purging with Co2. It's not an issue. It's a lot cheaper and you get way more purging gas out of a bottle.
If you want to stay with nitrogen it's fine with me0 -
A better question would be "Does CO₂ decompose when passed across copper heated to a red hot temperature." I don't know for sure (my public school education ended last century!), but I wouldn't be a bit surprised if it does.
We always just use N₂. Around here, an 80 CU FT bottle is like 12 bucks to exchange after you buy the first one.
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Look on U tube "NathansHVAC Co2 brazing" he brazes tubing with and without Co2. See for yourself0
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