[NSRCA-discussion] Robart air can leak

[John Ferrell]

I don't think any flux is required. I seldom need to solder aluminum but when I do it is an electronics application and would be rosin flux. ALL of the commercial Aluminum solders I have seen use very corrosive flux! 
John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: Jay Marshall 
  To: 'NSRCA Mailing List' 
  Sent: Sunday, April 30, 2006 4:41 PM
  Subject: Re: [NSRCA-discussion] Robart air can leak


  Emptying can be the best part.

  Is there a particular flux that will help the process John?

   

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Ferrell
  Sent: Sunday, April 30, 2006 3:03 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Robart air can leak

   

  You can solder to aluminum with regular solder. The problem is an oxide lay forms very quicky on aluminum. If you mechanically rub the solder blob with the soldering iron through the blob to scrape away the oxide layer while it is immersed in solder it will work fine. 

   

  Try it on a beverage can. Don't forget to empty it first!

   

  John Ferrell    
  http://DixieNC.US

    ----- Original Message ----- 

    From: Bob Richards 

    To: NSRCA Mailing List 

    Sent: Sunday, April 30, 2006 8:36 AM

    Subject: Re: [NSRCA-discussion] Robart air can leak

     

    Instead of just applying the solder over the hole, try cutting a small patch out of a soda can and lap-solder that over the hole. Of course, you need the special aluminum solder, called "alum-alloy" or something like that.

     

    Make sure the tank is vented while soldering.

     

    Bob R.



    Ken Thompson <mrandmrst at comcast.net> wrote:

      Does anybody have any clue how I can repair a pinhole leak in a Robart air cylinder?

       

      For some reason there is a tiny leak in the side of the can.  Solder and silver solder won't hold pressure.  I thought about JB weld for aluminum, but I'm not sure that will hold 80 to 100 PSI either.

       

      Any hints would be helpful, TIA.

       

      Ken

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