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Soldering sandblasted metal

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Alan K

05-09-1999 16:11:32




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In repairing a 6"x10" section of galvanized metal- the flat area I cleaned shinny smooth with a sanding disc on my mini-grinder then using soldering flux paste and solder coated the area by heating with a combination of propane torch and soldering gun all went well until I tryed to cover a couple of small uneven pitted areas which I left to be sandblasted clean and then soldered. I tryed to solder the sandblasted area WITHOUT LUCK. Please advise me. Thanks you very much in advance.

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Steve Hansen

05-11-1999 08:53:32




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 Re: Soldering sandblasted metal in reply to Alan K, 05-09-1999 16:11:32  
If you did not grind the zink off before you sand blasted I suspect some of it is still there.



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Alan K

05-11-1999 10:13:36




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 Re: Re: Soldering sandblasted metal in reply to Steve Hansen, 05-11-1999 08:53:32  
Thanks a lot Steve ! you are correct. I ground off the area and was able to solder. I knew that some zinc was there but thought that zinc was easy to solder. I even casually thought that lead,zinc & tin were the mix for solder, however I am now thinking only lead and tin compromise solder and zinc has to have its own solution. Solder works well with copper brass and steel I think. Do you know what works with zinc ?

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Steve Hansen

05-13-1999 02:20:32




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 Re: Re: Re: Soldering sandblasted metal in reply to Alan K, 05-11-1999 10:13:36  
Every now and then I see an ad in automotive magazines for a low temperature solder what is represented as working on just about everything including pot metal. I have not seen the ad recently and have no experience with the product. Zink is usually used as a coating. Even if you could solder it there would be questions about strength. This is because you would be relying on two connections - solder to zink and zink to base metal. Think you are better off grinding the zink away and soldering to base metal. You can restore the finish with galvanizing paint. It comes in a spray can. Fence builders use it to keep welds on gates and the like from rusting. Not as good as dipped but serviceable if applied with care. I have seen the stuff at Lowe's.

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Mike

05-14-1999 15:57:33




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 Re: Re: Re: Re: Soldering sandblasted metal in reply to Steve Hansen, 05-13-1999 02:20:32  
Seems to me that I remember soldering to galvanized surfaces (zinc coated) way back when without having any problems by using "Sal Amoniac" as the soldering flux. Been at least 20 years since I had to do that, so could be suffering from brain fade there too...



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