Copper Sheet Welding
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  1. #1
    Join Date
    Jan 2012
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    162

    Copper Sheet Welding

    Is there a good write-up on copper sheet welding? Running a syncrowave, tig, of coarse. What gas mix, polarity, electrode shape, pulse recommendations? Got $400+ in materials, and it absolutely needs to be water/air tight.

  2. #2
    Join Date
    Dec 2011
    Location
    The Netherlands
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    20

    Re: Copper Sheet Welding

    Here's a link on Jody's site with a lot of information on copper welding.

    http://www.weldingtipsandtricks.com/...r-welding.html

    Regards, Peter

  3. #3
    Join Date
    Feb 2011
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    Tennessee
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    291

    Re: Copper Sheet Welding

    Whiskey still huh? I use the same set up as I do for DCEN aluminum. Lab Grade helium, 2% thoriated tungsten, about 200 amps available to the foot control and patience. Weld it just like aluminum. The copper will turn black but will polish up nicely, post weld.
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  4. #4
    Join Date
    Nov 2005
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    267

    Re: Copper Sheet Welding

    Pangea, why lab grade? For that matter, what is your gas distributors definition of lab grade?
    Experience is something you get right after you need it

  5. #5
    Join Date
    May 2010
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    laguna niguel, Ca USA
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    942

    Re: Copper Sheet Welding

    UHP (Ultra High Purity) Helium is lab grade use it at work every day
    Last edited by WeldorWes; 01-22-2012 at 12:44 AM.
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  6. #6
    Join Date
    Nov 2005
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    267

    Re: Copper Sheet Welding

    I work in the gas business, and was wondering what various distributors call " lab grade." I just checked my website, and we have 5 different "lab grades", all with different specifications for individual impurities. We also have at least 1 industrial grade, and good ol balloon grade.
    Experience is something you get right after you need it

  7. #7
    Join Date
    Jan 2012
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    162

    Re: Copper Sheet Welding

    Quote Originally Posted by Pangea View Post
    Whiskey still huh? I use the same set up as I do for DCEN aluminum. Lab Grade helium, 2% thoriated tungsten, about 200 amps available to the foot control and patience. Weld it just like aluminum. The copper will turn black but will polish up nicely, post weld.
    Whiskey still!? If anybody asks its a boiler for those hobby miniature steam engines.

    I asked my boys down at the welder supply, UHP gas gets expensive. I need to know what grade. A difference between 0.1% can mean a big difference in price. Im worried about DCEN toasting my Tungsten at high amps.

  8. #8
    Join Date
    Sep 2008
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    SF bay area, CA
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    Re: Copper Sheet Welding

    F'em tell them its an ethanol plant.
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  9. #9
    Join Date
    Sep 2007
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    Yorkshire
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    338

    Re: Copper Sheet Welding

    Argon is fine for copper. I brazed up some 2" pipe with SIFBronze No1
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  10. #10
    Join Date
    Feb 2010
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    917

    Re: Copper Sheet Welding

    It appears that the use of helium is for the same reason you would use it with aluminum, to increase heat input into the puddle. Sounds like you can use 80/20 helium/argon just as well

  11. #11
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    Mar 2007
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    Re: Copper Sheet Welding

    If David is worried about what DCEN will do to his tungsten, hope he doesn't switch to DCEP.
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  12. #12
    Join Date
    Jan 2006
    Location
    western pennsylvania
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    406

    Re: Copper Sheet Welding

    It needs to be welded quickly from my experience. I've welded thinner stuff, 1/8 with argon DCEN with no problem. Never have used helium on copper so I defer to the poster who has. I did some welding on 1/2" copper with argon an DCEN and started our with a nice bead but quit working well after a couple of inches. It may work OK that way if the whole piece was shielded. My thinking is that too much heat got ahead of the weld puddle and when copper gets hot, it absorbs oxygen and you have contamination. The helium allows a much quicker puddle.
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  13. #13
    Join Date
    Jan 2012
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    162

    Re: Copper Sheet Welding

    I just brazed it up. It worked out well, and got it done cheap and fast. Screw welding it if you don't need too.

  14. #14
    Join Date
    Feb 2007
    Location
    SF bay area
    Posts
    607

    Re: Copper Sheet Welding

    we weld copper counter tops with integrated sinks. We use plain argon, dcen, and sheared filler rod.

    Gotta move fast, or it will start to oxidize. When butt welding sheets together we dont clamp the stuff close to the weld joint. It will shrink and stretch in a small area, and it is almost impossible to get if flat again. We find that it is best to just let it do what it wants to do naturally, its easier to flatten big humps, rather than mountains. Hard to explain, takes practice.

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