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Gas welding Aluminium.

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  • Moving molecules .
    replied
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ID:	4688 New Utube video......2 weeks ago....

    your thoughts please.👍

    Leave a comment:


  • Moving molecules .
    replied
    That’s true, I wonder what gas he is using... I am considering using Oxy hydrogen Gas and am learning about it.

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  • neilb
    replied
    it's not the size of the torch it's the temperature of the flame lol

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  • Moving molecules .
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ID:	3936 Am looking into some of the more modern methods of Gas welding Aluminum here is Mark Gerisch use a Smiths little Torch ( or Chinese copy ) it obviously works...

    but my first thoughts were that it wouldn’t give you enough heat or the point of the flame would be too sharp.

    any thoughts...

    it’s mostly because I don’t know what Torch to Buy....
    The one I use in my old place is now discontinued.

    Leave a comment:


  • Chazza
    commented on 's reply
    One of Peter's DVD's has a very good instruction on aluminium welding by Tom Peach. DVD No. 4 I think.
    Last edited by Chazza; 18-07-20, 02:57 AM.

  • Moving molecules .
    replied
    Originally posted by Peter Tommasini View Post
    It's good to see you guys sharing tips and tricks on all subjects regarding metalshaping ...keep it up
    Peter T.
    Pete , can you make a great Gas welding Aluminum video 👍😉, because their are no good ones on UTUBE.


    Leave a comment:


  • Bill Tromblay
    replied
    Hi,

    I went back to page one of this post and say your low pressure gauge set up, that will work fine, I forgot you did that. I found a company that rebuilds and sells regulators and very good pricing. Once I talked with him, he set me up with duel stage regs, with low tension springs and low PSI gauges. Now the flame is very stable and controllable. I can send his contact info if interested.

    B

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  • cliffrod
    replied
    Originally posted by Bill Tromblay View Post
    Hi Cliff,
    Yes, oxide has a higher surface tension than non-oxidized aluminum, this is due to a higher melt temperature of aluminum oxide, then the base material. Flux is chemically cleaning the surface of oxide and de-gassing the weld pool. Because of the oxide issue, it is always good to wire brush or scotch brite the weld area before you start on both side, in both gas and tig welding.

    If you search McMaster/Carr, they sell 0-15 psi oxygen approved gauges that you could use to replace your 0-150 psi units. Only use Oxygen approved gauges on the oxygen side due to a danger of mixing oil in a O2 system. If you go the low gauge route, every day when you are done welding, be sure to back the regulators off, to eliminate a surge when you open the tank the next time and damage the new gauges. Good practice with any regulator.

    I can bring the hydrogen to Jim Hury's event, if you are interested in giving it a try.

    Hope it helps and you are doing well.

    Bill
    Is the regulator for low psi different (thread pitch or rate of actuation) than a regular regulator? I thought I needed more than just a gauge, so had put off the expense getting another regulator & gauge. When I found I could use this external pressure gauge for free, I was quite happy. I always fully release my regulators when I close the tanks at the end of any welding.

    i would like to try the hydrogen. Thank you for the offer.

    Leave a comment:


  • Peter Tommasini
    replied
    It's good to see you guys sharing tips and tricks on all subjects regarding metalshaping ...keep it up
    Peter T.

    Leave a comment:


  • cliffrod
    replied
    Thanks, Bill. I figured the function of flux would mean a difference in surface tension. No worries, I'll keep practicing.

    I hope all is well in your world. Things are good here. This sculpture business has been much like covid days for at least a decade, so not much different. I talked to Jim yesterday. All is good there, too. He's still planning on the RR in Aug as long as covid things are ok. But he got so much happening it sounds like we might have to have the meet next door. Not sure there'll be any room left in his place for visitors.....

    Leave a comment:


  • Bill Tromblay
    replied
    Hi Cliff,
    Yes, oxide has a higher surface tension than non-oxidized aluminum, this is due to a higher melt temperature of aluminum oxide, then the base material. Flux is chemically cleaning the surface of oxide and de-gassing the weld pool. Because of the oxide issue, it is always good to wire brush or scotch brite the weld area before you start on both side, in both gas and tig welding.

    If you search McMaster/Carr, they sell 0-15 psi oxygen approved gauges that you could use to replace your 0-150 psi units. Only use Oxygen approved gauges on the oxygen side due to a danger of mixing oil in a O2 system. If you go the low gauge route, every day when you are done welding, be sure to back the regulators off, to eliminate a surge when you open the tank the next time and damage the new gauges. Good practice with any regulator.

    I can bring the hydrogen to Jim Hury's event, if you are interested in giving it a try.

    Hope it helps and you are doing well.

    Bill

    Leave a comment:


  • cliffrod
    replied
    Great information, Bill. My gas welding needs lots of practice and no oxy-hyd plans here now, but this helps a lot. I've got a question you or someone else may be able to answer.

    With oxy-act I haven't found I'm producing salt/crystalline inclusions. The gauges allowed me some manner of consistency because my regulator gauge is a 150psi as mentioned so it doesn't budge at nominal pressure settings. I was frustrated about inconsistent results and crappy welds as posted previously.

    Resolving a properly numbered but damaged/deformed #3 tip has helped a lot. Not much welding time since then, but running a quick bead along a coupon of aluminum with this tip allowed me to produce a fully liquid pool with great control, either consistently flush with the surface or pendant/sagged without any loss or holes even along an edge. It was like I was welding much thicker material than before, lots more control. I didn't use flux for this quick test, so there's a layer of oxide over the bead portion.

    before I assume that I've improved and then just produce more scrap- Does a skin of oxide on an unfluxed molten bead have a greater/different surface tension than a fluxed molten bead?

    Leave a comment:


  • Bill Tromblay
    replied
    Hi,

    With the hydrogen unknowingly at 10 psi, I was running the oxygen (unknowingly) at the same pressure. The Oxygen needed to be that high, to create a cone. So even with high pressure, you can mix the gas to change the cone length, just as you can at 1 psi. The one thing i noticed with the higher pressure, you could go from a cold flame, to brutally hot, with a slight bump of the control valves on the torch. You had no fidelity with the controls. With the pressure now set correctly, I have a lot of control. One way I thought of explaining it, would be to turn up the TIG welder to full amperage than weld with it. Can you do it? Sure, but it isn't easy and will look bad.

    I saw a picture today on-line of a Oxy/Acetylene gas weld on .063" 3003 aluminum and they had it set at 4 psi Oxygen and 4 psi Acetylene and their results had the same appearance as my welds. You can see the "salt crystal grains" appearance running thru the top of the weld and the bottom looks fine. As metal shaper's, most guys dont care about the appearance, because you grind the weld off or planish it into the surface. On most aircraft components, the welds were left visible, and caused my concern to solve the problem.

    B
    Last edited by Bill Tromblay; 23-04-20, 01:06 AM.

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  • joeswamp
    replied
    Hey Bill -- Are you saying that you were oxidizing the weld because your oxygen was set too high, or are you saying that both pressures were set too high? If it's the latter (and you were putting too much heat into the weld), doesn't that mean the length of the innermost cone would have been too long? I thought that the little inner cone length was really the critical factor, as it correlates well with gas flow. This is assuming the flame is close to neutral.

    Maybe these are dumb questions as I've never tried oxy-hydrogen welding, I've heard you can't really see the flame and so I have no idea how you would adjust it. The flame is cooler so I'd expect you could go a little slower than with oxy-acetylene. I do know that a lot of people prefer it.

    Leave a comment:


  • Bill Tromblay
    replied
    Hi,

    I was thinking and this may be a possibility. The cheek method may work with oxy/Acetylene, even though the welding books recommend the same low pressures. But I do know that does not work with Oxy / Hydrogen. I haven't come up with a reason as to "why" one and not the other, just my experience. Kent knows what he is doing and what he is talking about and I know the cheek method works for him with acetylene.

    B

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