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Inert Gas Kit For Heat Treating Oven

Discussion in 'Forges, Ovens, Kilns, & Salt Pots' started by Vladimir, Jan 13, 2021.

  1. Vladimir

    Vladimir New Member

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    Anybody else see this episode of This Old Tony, where he installed a inert gas kit into to his oven?
    It's interesting, but I'm not sure if it would be cheaper than SS foil or coatings. Not sure if that link will work.

     
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  2. Joelsund

    Joelsund Active Member

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    Would be pretty awesome. I would assume sourcing argon would be quite difficult though.
     
  3. dancom

    dancom Dust Maker

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    I looked into this a few years back. Perhaps with exception to a salt bath, I believe argon shielding is the most cost effective protection, once you get setup.

    Argon a common shielding gas in GMAW and is available at any welding shop, farm supply places and some hardware stores have a swap-a-bottle programs.
    Keep in mind there is an asphyxiation hazard with argon or any gas that replaces the air we breathe. Might not be an issue in a large shop or where the door is open, but a tiny sealed shop you'd want to get some ventilation to be safe.


    Dan
     
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  4. Griff

    Griff Active Member

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    I opted out of this option on my Paragon Double Barrel Kiln, because I didn’t know any better...I would probably get it if I had a do-over.
     
  5. dancom

    dancom Dust Maker

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    Griff,

    I think it's pretty easy to setup. You need a small tank, a regular/flowmeter you can set to a couple of cubic feet per hr. and hose with a fairly long stainless steel tube that goes into the interior of the kiln. The length helps shed the heat a bit before getting to the hose fitting. You'd have to make a penetration in the back of the kiln. That will flood the interior with gas and you're good.

    Reminder that argon is heavier than air, so any excess will accumulate around your feet first...like propane...so put your bird cage on the floor. ;)

    I still have a 1/2 can of Condursal left, but this will be my project when the Condursal runs dry.

    Dan
     
  6. Joelsund

    Joelsund Active Member

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    Would your oven need to be perfectly sealed so the argon doesn’t escape? Or does the constant flow keep up its levels and force out oxygen if your oven had a leak
     
  7. Griff

    Griff Active Member

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    At a guess I’ll say constant flow...I don’t think Kilns are air tight.
     
  8. dancom

    dancom Dust Maker

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    Ideally the chamber is perfectly sealed, but in reality there's always going to be some way for the argon to escape. From Paragon's technical brief:

    "The theory behind gas injection is to provide a slight positive pressure internal to the furnace to force air out. There will always be some mixing of air with the incoming gas, but with attrition, the amount of normal atmosphere air will decrease dramatically and the firing chamber will contain almost exclusively the injected gas."

    Paragon recommends very small flow rates, as low as 0.2 cu. ft./hour. The larger the chamber the higher the flow rate. Plan on 1 cu. ft./hour. One recommendation I heard from Ray Rogers was he sets his flow at 7 to 8 cu. ft./hour! That's probably a leaky oven. In any case, we're talking about a small amount of gas and a bottle will last a long time, say 80 hours or more. Welders may use 20 or 30 cu. ft./hour.

    Dan
     
    Last edited: Jan 14, 2021
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  9. Joelsund

    Joelsund Active Member

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    Might have to look into it. Surprised more people don’t do it as it seems relatively simple.
     
  10. RussGen

    RussGen New Member

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    I'm coming up empty trying to find that kit on the internet. Seems easy enough to set up.
     
  11. dancom

    dancom Dust Maker

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    Russ,

    I couldn't find that specific argon kit shown for sale either. I did find a video that shows kit's the parts in detail. It'd be pretty simple to source parts that serve the same purpose. In the video it's around the 3:38 mark.


    Dan
     
    Last edited: Jan 18, 2021
  12. RussGen

    RussGen New Member

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    Thanks Dan. I think that's the way to go. I found one person on a forum who bought a kit the same name as their oven. Turned out the regulator wasn't specifically for argon and would have to be recalibrated.
     
  13. Vladimir

    Vladimir New Member

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