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back purge

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  • 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
    what kind of bucket???


    • #3

      the bucket is stainless


      • #4
        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
          A question on back purging SS. Is it OK to use nitrogen for the back purge. Thanks!


          • #6
            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
              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.


              • #8
                A research paper on Nitrogen purging from the AWS site:

                Looks OK for Nitrogen.


                • #9
                  thinks for all the info it worked great for me


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