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  1. #1
    Join Date
    Oct 2009
    Location
    Rio Rico, AZ
    Posts
    2

    Default Copper to stainless TIG welds

    I would like to know if it is possible to TIG weld copper pipe fittings to 300 series stainless steel. My client is presently silver soldering these butt joints but that is pretty expensive. A TIG weld would be much preferable.

  2. #2
    Join Date
    Jun 2006
    Location
    Maine
    Posts
    732

    Default

    I think you're limited to soldering/brazing them.
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  3. #3
    Join Date
    Oct 2007
    Location
    Mt. Clemens, Michigan
    Posts
    277

    Default

    I've done it a little bit with silicon bronze, but it's prone to hot cracking so you've got to be very careful with the heat. It's more of an "electric braze" than a weld.

  4. #4
    Join Date
    Feb 2009
    Posts
    146

    Default Copper Tig

    Depends on the grade of copper. Marine use 90/10 Copper Nickel can be welded to Carbon Steel pipe with ERNiCu7.

    Find out your grade of Copper and go from there.

  5. #5
    Join Date
    Sep 2008
    Location
    southwestern ohio
    Posts
    272

    Default

    what is the pupose of this fitting?
    any pictures?
    This is an automotive discussion forum that has some great infromation

    www.autobodytoolmart.com/shoptalk

  6. #6
    Join Date
    Nov 2006
    Location
    Hampton, Va.
    Posts
    386

    Default

    If this is a cuni fitting mated to a ss fitting you can weld it with RN82 inconel tig. I have done this numerous times and with great results. You can also use EN82 as well.

    Wheelchair

  7. #7
    Join Date
    Apr 2009
    Location
    KANSAS
    Posts
    511

    Default

    Quote Originally Posted by Wheelchair View Post
    You can also use EN82 as well.

    Wheelchair
    All Right

    I read this thread earlier and was going to make a joke about using inco 82.

    It really is a "Wonder Wire"
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  8. #8
    Join Date
    Oct 2009
    Location
    Rio Rico, AZ
    Posts
    2

    Default Thread author

    The application is attaching copper sweat fittings to the end of flexible stainless steel hose assemblies. The assemblies are composed of a corrugated thin wall (.010" to .016" wall) hose which is covered with a stainless steel braid. A stainless collar or ring (around .032" thick) is placed around the hose end to hold the hose and braid tightly against one another and add a little thickness to the joint. A "cap" weld is TIG'd using 309 rod.
    The copper sweat fitting is placed on top of the cap weld and (currently) silver brazed. I will check the copper type, but as they are just the common copper plumbing couplings, they are probably not CuN.
    All advise is appreciated!!

  9. #9
    Join Date
    Oct 2009
    Location
    Buffalo New York
    Posts
    42

    Default

    I do refrigeration work and used to install machines using what sounds like similar SS flex hoses. With some heat protection( a wet rag or some thermo-trap),stay silv white brazing flux, staysilv 45 brazing alloy, and an O/A setup these joints were completed very quick and inexpensive. These were all field joints and I don't tig so I really couldn't compare cost or time. The brazing alloys and fluxes are available at most HVAC/R suppliers, and if the guy at the counter isn't a turd, you should have no trouble walking in off the street for a purchase.

    Oh and by the way, Are you sure they are butt joints?
    Last edited by Fruecrue; 10-07-2009 at 03:54 AM. Reason: edit

  10. #10
    Join Date
    Nov 2006
    Location
    Hampton, Va.
    Posts
    386

    Default

    Quote Originally Posted by Rig Hand View Post
    All Right

    I read this thread earlier and was going to make a joke about using inco 82.

    It really is a "Wonder Wire"
    It's got my vote.

    Wheelchair

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