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Thread: CuNi 70/30 3g?

  1. #11
    Join Date
    May 2012
    Posts
    14

    Default

    Anyone else have any tips and tricks for this material? Thanks again! The replies have been helpful.

  2. #12
    Join Date
    Apr 2010
    Location
    Newport News, VA/Fremont, OH
    Posts
    182

    Default

    This seems odd that NavSea has not given you any procedures to work by, especially being nuke work. They are on us constantly about procedure here. CuNi typically doesnt have a preheat temp that I'm familiar with, but welding Hy usually calls for at least 125 degree preheat over 1" thick. CuNi is kinda strange to work with, as the puddle is so dead. We run into fusion problems when trying to add too much filler. Maybe try a lighter root pass to ensure good fusion if you cant get a hotter welder.... on that note, are you getting indications in any particular area, towards the root, or intermediate passes?

  3. #13
    Join Date
    Nov 2012
    Posts
    1

    Default Did you try this?

    I would suggest using atleast a 1/8'' 2% Thoriated for that kind of welding and thickness... Sounds like you need some more heat.

    Hope maybe that helps.

  4. #14
    Join Date
    May 2012
    Posts
    14

    Default

    Quote Originally Posted by hockeyguynick View Post
    This seems odd that NavSea has not given you any procedures to work by, especially being nuke work. They are on us constantly about procedure here. CuNi typically doesnt have a preheat temp that I'm familiar with, but welding Hy usually calls for at least 125 degree preheat over 1" thick. CuNi is kinda strange to work with, as the puddle is so dead. We run into fusion problems when trying to add too much filler. Maybe try a lighter root pass to ensure good fusion if you cant get a hotter welder.... on that note, are you getting indications in any particular area, towards the root, or intermediate passes?
    Sorry its been so long since last reply been kinda busy workin WAY too many hours on this project.
    Finally figured this crap out though......here are a couple pics of the progress.
    Thanks for all the advice guys!
    Last edited by DirtyDan; 02-02-2014 at 01:22 PM.

  5. #15
    Join Date
    May 2012
    Posts
    14

    Default

    Quote Originally Posted by hockeyguynick View Post
    This seems odd that NavSea has not given you any procedures to work by, especially being nuke work. They are on us constantly about procedure here. CuNi typically doesnt have a preheat temp that I'm familiar with, but welding Hy usually calls for at least 125 degree preheat over 1" thick. CuNi is kinda strange to work with, as the puddle is so dead. We run into fusion problems when trying to add too much filler. Maybe try a lighter root pass to ensure good fusion if you cant get a hotter welder.... on that note, are you getting indications in any particular area, towards the root, or intermediate passes?
    There were no NavSea procedures because we are just retrofitting new cradles onto these old condensers. We are not modifing any pressure retaining components......yet.
    I start building these from scratch after retrofitting 20 of these old units....

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