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  1. #1
    Join Date
    Jun 2007
    Posts
    4

    Question What's the best way to weld copper?

    I have a few projects planned where I will need to weld copper to copper. Some copper pipe, and some copper sheet metal. These projects will need strong welds, I also dont want a brass look where the weld joints are, like sweating in plumbing. I am looking into patina or burnt copper finish when I am done, so it has to look good, I can grind down a weld with no problems if the process doesn't add another metal type that will show through and ruin the look I am going for. I appreciate any and all comments!
    - 250 Bobcat
    - too many irons in the fire

  2. #2
    Join Date
    Dec 2006
    Location
    Alaska
    Posts
    732

    Default

    GTAW and lots of amps and for filler use the same material as the parent material
    TJ______________________________________

  3. #3
    Join Date
    Aug 2006
    Location
    near rochester NY
    Posts
    9,881

    Default

    yep TIG it, just remember it sucks up the heat so you will need big amps for any thing thick. how thick is the copper you intend to do?? if its realythick you might need to go to plasma welding it.
    thanks for the help
    ......or..........
    hope i helped

    feel free to shoot me an e-mail direct i have time to chat. james@newyorkmetalart.com
    summer is here, plant a tree. if you don't have space or time to plant one sponsor some one else to plant one for you. a tree is an investment in our planet, help it out.
    JAMES

  4. #4
    Join Date
    Jun 2007
    Posts
    4

    Default

    One project is sheet metal, haven't bought it yet so don't have the thickness. The other is copper plumbing pipe.

    I have access to a Miller 175 Mig. Is there any way to use that for this project?
    I saw on mw.com where this welder is capable of copper welding. Someone told me that I could weld copper w/ the 175, but would need a spool gun to do it.

    Thanks for the input!
    - 250 Bobcat
    - too many irons in the fire

  5. #5
    Join Date
    Dec 2005
    Location
    wisconsin
    Posts
    836

    Default

    Quote Originally Posted by subzero View Post
    One project is sheet metal, haven't bought it yet so don't have the thickness. The other is copper plumbing pipe.

    I have access to a Miller 175 Mig. Is there any way to use that for this project?
    I saw on mw.com where this welder is capable of copper welding. Someone told me that I could weld copper w/ the 175, but would need a spool gun to do it.

    Thanks for the input!

    I doubt the cabability of the 175 for what your needing.
    If you dont have a TIG, gas weld it using copper filler and flux, its used a lot for ornamental copper work and copper pressure vessels.
    www.tinmantech.com is a good source for materials and further information.
    -Aaron
    "Better Metalworking Through Research"

    Miller Dynasty 300DX
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    Miller Spot Welder
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    Smith, Meco, Oxweld , Cronatron, Harris, Victor, National, Prest-o-weld, Prest-o-lite, Marquette, Century Aircraft, Craftsman, Goss, Uniweld, Purox, Linde, Eutectic, and Dillon welding torches from 1909 to Present. (58 total)

  6. #6
    Join Date
    Sep 2002
    Location
    Clark County, NV
    Posts
    2,696

    Default

    GTAW with a piece of the actual parent metal to use for filler is the best way to achieve the perfect finish you are looking for.

  7. #7
    Join Date
    Jun 2007
    Posts
    4

    Default

    Quote Originally Posted by makoman1860 View Post
    I doubt the cabability of the 175 for what your needing.
    If you dont have a TIG, gas weld it using copper filler and flux, its used a lot for ornamental copper work and copper pressure vessels.
    www.tinmantech.com is a good source for materials and further information.
    -Aaron
    I appreciate the advice, I have checked out the site and believe I will begin by trying my projects w/ OA torch.

    I never object to having too many tools, so I have another question. If you were going to be welding copper among other things, "Which TIG would be your choice, while trying to stay budget minded?".
    I saw a used Miller Econotig for $1100obo, also a few Syncrowave 200's pop up from time to time. I know some of you guys say crank up the amps. What amp range is adequate?

    I sincerely appreciate your help!
    - 250 Bobcat
    - too many irons in the fire

  8. #8
    Join Date
    Jan 2007
    Location
    Midland, Mi.
    Posts
    313

    Default

    Quote Originally Posted by subzero View Post
    One project is sheet metal, haven't bought it yet so don't have the thickness. The other is copper plumbing pipe.

    I have access to a Miller 175 Mig. Is there any way to use that for this project?
    I saw on mw.com where this welder is capable of copper welding. Someone told me that I could weld copper w/ the 175, but would need a spool gun to do it.

    Thanks for the input!
    You can get silicon-bronze mig wire and with 100% argon you can mig braze it. Daytona Mig has 2lb spools of .030 s/b wire for around $30, 10lbs for $140.
    Not sure if you need a spool gun to use it like you do with Al.

  9. #9
    Join Date
    Sep 2002
    Location
    Clark County, NV
    Posts
    2,696

    Default

    Quote Originally Posted by TS-Off-Road View Post
    You can get silicon-bronze mig wire and with 100% argon you can mig braze it. Daytona Mig has 2lb spools of .030 s/b wire for around $30, 10lbs for $140.
    Not sure if you need a spool gun to use it like you do with Al.
    How will the final finish turn out compared to the properties of the parent weldment?

    You shouldn't need a spoolgun. Silicon Bronze wire is much stiffer than aluminum.

  10. #10
    Join Date
    Jun 2007
    Location
    Illinois
    Posts
    4

    Default Copper to Copper

    What wall thickness on the pipe?
    Silver brazing works fine -a 45% or a 50N flow very nice, although it is expensive - sold by the ounce if that tells ya anything - or you could use a 15% sil/phos as well.

    Welding copper - again thickness matters - 250 amp Miller Syncrowave would be my machine of choice. Set on AC, Hi-Freq continous, pure tungsten, sil/bronze as your filler material and 100% Argon for shielding gas.
    Steve Beckman

    Rockford Industrial Welding Supply, Inc.
    "Setting the Standard in Service"
    1.800.226.1904
    riws.com

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