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Thread: back purge

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  1. #1
    Join Date
    Oct 2007
    Location
    West GA
    Posts
    71

    Default back purge

    can you all show someone how to back purge a bucket to repair the pin holes in the bottom. And what all is needed to do so.

  2. #2
    Join Date
    Feb 2010
    Location
    YOUNGSTOWN, OHIO
    Posts
    172

    Default

    what kind of bucket???
    JIM

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  3. #3
    Join Date
    Oct 2007
    Location
    West GA
    Posts
    71

    Default stainless

    the bucket is stainless

  4. #4
    Join Date
    Dec 2012
    Location
    Simcoe Ontario
    Posts
    91

    Default back purge

    Cover the open end with say cardboard taped to it with the argon hose going in and some kind of small opening at the top. Argon is heavier than air so as long as the vent is at the top it will work

  5. #5
    Join Date
    Oct 2011
    Location
    Minnesota
    Posts
    54

    Default

    A question on back purging SS. Is it OK to use nitrogen for the back purge. Thanks!
    Tim

    Many cordless tools...........
    2 cordless hammers
    2 cordless punches
    1 cordless chisel
    2 cordless screwdrivers, 1 + and 1 -
    and a cordless adjustable wrench that also doubles as a hammer.....

  6. #6
    Join Date
    Oct 2013
    Posts
    10

    Default back purge

    We used nitrogen all the time at my previous employer. I believe it was cheaper than argon. Just make a small hole in the cardboard about 1/8 to 1/4 in diameter for the gas pressure to escape. Make sure you have the cardboard fastened really good. I would purge it really good and set the flow meter at about 5 to 7 lbs as you weld. If the weld starts to blow out at you, stop and either make the relief hole bigger or lower the purge gas pressure.

  7. #7
    Join Date
    Oct 2011
    Location
    Minnesota
    Posts
    54

    Default

    Quote Originally Posted by bubbaweld View Post
    We used nitrogen all the time at my previous employer. . . .
    Thanks! I have N2 in my car tires so have to get set up to "air" them up. So I'll be basically set.
    Tim

    Many cordless tools...........
    2 cordless hammers
    2 cordless punches
    1 cordless chisel
    2 cordless screwdrivers, 1 + and 1 -
    and a cordless adjustable wrench that also doubles as a hammer.....

  8. #8
    Join Date
    Apr 2010
    Posts
    274

    Default

    A research paper on Nitrogen purging from the AWS site: http://www.aws.org/wj/supplement/WJ_1975_01_s12.pdf

    Looks OK for Nitrogen.
    Miller stuff:
    Dialarc 250 (1974)
    Syncrowave 250 (1992)
    Spot welder (Dayton badged)

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