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  1. #11
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    Default Re: Mag-Torch any good?

    Quote Originally Posted by Arc weld View Post
    That's SCARY! I doubt your gas supplier is aware that you're filling acetylene from a larger cylinder. I work at a welding supply and all the acetylene cylinders are shipped to the main fill plant where they are filled in a controlled environment. Hopefully no one will follow your practice of transferring acetylene from one cylinder to another. I believe it's illegal. Oxygen and most high pressure gases can be transferred though.
    You work at a welding supply and were asking here what to use to weld cast iron.?

    Wouldn't surprise me to find out that it's illegal but the only law I know of is the transport law. MSHA - Safety Hazard Information - Special Hazards of Acetylene

    I suppose it is dangerous to post stuff like that on the Internet as you have no idea what experience or knowlege others have.

    Not to mention the fellow that invented the substrate that allowed the safe storage of acetylene in the first place lost his eye sight pressure testing with it. Gustaf DalÚn - Wikipedia, the free encyclopedia

    So if you didn't want to learn the process because a mistake, if you make one, could be your last, you could always just make your own when you need it with calcium carbide and water, in an acetylene generazor.
    http://www.rexarc.com/uploads/articles/pdf/50PSlit.pdf

  2. #12
    Platinum Member npalen's Avatar
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    Default Re: Mag-Torch any good?

    What happens if you connect a compressed air source in lieu of the oxygen bottle?
    Palen Archtops at http://guitarsnjazz.com/

  3. #13
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    Default Re: Mag-Torch any good?

    Yah, I asked how to do a specific cast iron repair on an engine block I spent $7000 rebuilding a few years ago. There is nobody on the planet that knows everything about welding or the best procedure for each application. I worked on tanks, skids, piping, vessels and oilfield equipment. Not too much cast iron or engine blocks. Don't know what that has to do with the topic of transferring acetylene from a large to small cylinder though.

    Acetylene generators are used to make acetylene. Back in day shops had acetylene generators but they were banned because of too many serious accidents. There's also a BIG difference between using something with built in safety features than making your own setup. How do you measure how much acetone is left in your cylinder? Acetylene is filled by weight, not pressure. The amount that can be put in is dependant on how much acetone is in the cylinder. That's why a lot of larger acetylene cylinders have a sticker showing the cu. ft. or cu. meters of acetylene in the cylinder. I toured a fill plant and we couldn't even go into the acetylene room. We had to stand outside the door because you had to have fireproof clothing. Acetylene isn't something to experiment with and I really hope no one else tries to fill their own cylinders. Below is from your own link you posted: Although it says from a torch, there isn't much difference if it came directly from the cylinder. It's still unburned acetylene gas.

    NEVER DISCHARGE UNBURNED ACETYLENE GAS FROM A TORCH INTO ANY TYPE OF CONTAINER OR VESSEL.
    When unburned acetylene gas is discharged from a torch, static electricity can be generated at the torch tip. If the tip comes in contact with a ground path, a static spark capable of igniting the acetylene can occur.


    npalen, compressed air won't do anything. It would probably blow the flame out. You need pure oxygen.

  4. #14
    Platinum Member npalen's Avatar
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    Default Re: Mag-Torch any good?

    I'm wondering if an oxygen concentrator designed for medical use would be a good investment for the small oxy/fuel torch. The idea is to replace the need for any stored oxygen and use the machines output instead. My understanding is that it takes about three liters/minute of oxygen to supply the small torch at it's highest heat setting and most of the home concentrators put out a maximum of about five liters/minute. The output is adjustable to match the requirement of the fuel being used. (Mapp, Propane etc.) I did watch a fairly long winded youtube video where a guy is running his torch with an oxygen concentrator. Here is a link on how a concentrator works. Medical Supplies: How Does An Oxygen Concentrator Work? Seems like the used ones run in the neighborhood of $300.
    Palen Archtops at http://guitarsnjazz.com/

  5. #15
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    Default Re: Mag-Torch any good?

    Oxygen isn't the expensive gas so I don't know if it's worth all the trouble.

  6. #16
    Platinum Member npalen's Avatar
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    Default Re: Mag-Torch any good?

    Arcweld, I may have misread some of the above posts but I was lead to believe that the oxygen cost is the killer when using the small torches. See posts 4, 5 & 6 above.
    I've had access to cutting torches and welding equipment most all of my life but have never really learned to weld with oxy/fuel. I thought the small torch would be a good way to pick up a bit of expertise without spending a ton of money. Simple things like silver soldering carbide tips to cutting tools have always intrigued me.
    Palen Archtops at http://guitarsnjazz.com/

  7. #17
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    Default Re: Mag-Torch any good?

    With the tiny cylinders it's all expensive. If I was you, I would get a 75 cu. ft. acetylene and 122 cu ft. oxygen cylinder. You'll be able to get a lot done and the cost per cu. ft. will be a lot lower.

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