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  1. #1
    Join Date
    Nov 2005
    Posts
    22

    Question How to remove discoloration from heat?

    I need to figure out how to remove the discoloration the heat from welding stainless steel produces. I'm using 20GA brushed or mirror finish so I need a solution that doesn't involve abrasives, etc. Possibly an acid I could immerse the part in? Pictures below showing the blue/gold color. Thanks for any help!






  2. #2
    Join Date
    Dec 2007
    Posts
    16

    Smile passivation

    passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution,most typically by a treatment with an acid solution that will remove the surface contamination but will not affect the stainless steel parts where i work we have a machine that we ground to the welded part then there is a hand held part that you slide a sock type cotton over and put in the acid solution and rub across the welds and it looks like new when done i hope this has helped.

  3. #3
    Join Date
    Nov 2005
    Posts
    22

    Default

    Quote Originally Posted by brian View Post
    passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution,most typically by a treatment with an acid solution that will remove the surface contamination but will not affect the stainless steel parts where i work we have a machine that we ground to the welded part then there is a hand held part that you slide a sock type cotton over and put in the acid solution and rub across the welds and it looks like new when done i hope this has helped.
    Any specific brand names or machine names I can look up? I've heard you can weld the part in a fully saturated container of Argon, but that's not practical for my needs. I'm really looking for something like you explained...

  4. #4
    Join Date
    Apr 2007
    Location
    Ventura, California
    Posts
    102

    Default Try Surfox

    Quote Originally Posted by toofazt View Post
    Any specific brand names or machine names I can look up? I've heard you can weld the part in a fully saturated container of Argon, but that's not practical for my needs. I'm really looking for something like you explained...
    Walter makes a line of equipment called Surfox. They aren't cheap (expect to be set back about $1500 ), but they do work well.

    http://www.industrialtool.com/prodde...sp?prod=Surfox
    Dynasty 200 DX
    Coolmate 3

  5. #5
    Join Date
    Nov 2005
    Posts
    22

    Default

    Thanks for the link Dave.

    Some interesting info on the topic can also be found here:

    http://www.azom.com/details.asp?ArticleID=1142

    http://www.avestafinishing.com/pages/Page____517.aspx
    Last edited by toofazt; 12-21-2007 at 01:31 AM.

  6. #6
    Join Date
    Mar 2007
    Posts
    356

    Default

    go to your local welding shop or gas supplier and ask for pickling paste, directions are on the side of the container
    mm210
    maxstar 150

  7. #7
    Join Date
    Aug 2006
    Location
    near rochester NY
    Posts
    9,881

    Default

    i don't think welding it in a argon chamber will keep it from discoloring.
    as for getting rid of it, stop in at your local welding shop and ask them who dose demo's in the area for them. almost every open house at my welding shop has had a guy there to show off the lil cleaner's. they work great but as Samurai Dave said they are expensive. get some out to do a demo for ya.

    do you do the polishing or get it like that ? have you tried a polishing compound and a budding wheel ?? i don't know if it will work but i would give it a try with a good cleaning compound then a polishing one. its a much smaller investment than the power cleaner.

    best of luck
    let us know who it comes out.
    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

  8. #8
    Join Date
    Mar 2007
    Location
    ****inson ND
    Posts
    557

    Talking

    Quote Originally Posted by fun4now View Post
    i don't think welding it in a argon chamber will keep it from discoloring.
    Yes it will. It's the atmosphere coming in contact with the stainless after the post flow stops while the peice is still hot that causes it to oxidize.

  9. #9
    Join Date
    Dec 2007
    Posts
    16

    Smile argon chamber

    i would say welding in a argon chamber would be a pain in the a$$. passivate is the way to go .i will get you a name of a passivation machine soon .

  10. #10
    Join Date
    Dec 2007
    Posts
    2

    Default

    Try "blue away" you should be able to get it from any Hardly dealer. It is used to get rid of the discoloration on motorcycle exhaust.

    http://denniskirk.com/jsp/product_ca...d=22204&mmyId=

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