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Tool Talk Discussion Forum

Need help soldering stainless steel

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Putz

12-02-2004 07:17:29




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I am trying to solder stainless steel to copper tubing for a weather vane. Anybody know the best way and what to use? I have a propane torch and a big soldering iron. Thanks for any help




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jonesy

12-05-2004 20:38:53




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 Re: Need help soldering stainless steel in reply to Putz, 12-02-2004 07:17:29  
You should use 45% silver for that. THey make a flux coated rod that works great. You can also buy the silver by the roll but you have to buy the tinning flux paste as well. Also, make sure your surface is VERY clean. You will need to use Oxy/acetylene torch to get it hot enough.



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mike brown

12-02-2004 10:20:09




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 Re: Need help soldering stainless steel in reply to Putz, 12-02-2004 07:17:29  
I looked this up in my Cornell metal working book (at work).
1.Surface to be soldered must be free of grease,dirt,oxides etc.
2. The flux must have the ability to etch the surface and to remove chromium oxide. Use hcl (carefully). Let flux work for about 5 min before soldering.
3. USe 95-5 or 50-50 solder (for non food handling)
4.Heat must be above 450
5. Solder the stainless first then solder the copper to the tinned stainless

Hope this helps.

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MAC,IL

12-02-2004 09:35:40




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 Re: Need help soldering stainless steel in reply to Putz, 12-02-2004 07:17:29  
Been a while but I used to use a low temp blue coated silver solder rod with my acet. outfit. on SS. Seems it was a 1020 rod?



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Ramrod

12-02-2004 08:01:44




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 Re: Need help soldering stainless steel in reply to Putz, 12-02-2004 07:17:29  
It's all in the flux. You'll need a flux specifically labeled for stainless, probably a muriatic acid fulx will work for soft solder, but if you're silver soldering, I think you'll need a different flux for that.

Ramrod



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