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Old copper with paint, cleaned end, fluxed it, tried to tin it and solder will not stick. Tried three times. I was using my plumbers torch so I don't think heat was a problem. I have only run across this problem one other time and ended up replacing the whole pipe.

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Are you trying to solder on a closed piping system? If so one thing that will cause many problems is any moisture in line. It does not take but a drop or so to vaporize to steam and cause oxidation on pipe or fitting which will cause solder not to stick.If you are working on closed piping try to find valve or faucet somewhere to vent steam. I would clean again and make sure you are using good flux and right solder & try again. Hope this helps. Thanks

Posted on Nov 09, 2010

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This = No

"Kemtex B916 Tinning Compound
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Should state Rosin Flux Paste for what you want.
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Having trouble with solder sticking with metal to metal applications


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Old Victorian Light fixture needs to be repaired. I think soldering the broken parts together would work, but I've never soldered brass parts (only simple electronic motherboards). Anyone out there that...


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Can I get replacement batteries for my Norelco 7735X shaver?


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I have had best success with utilizing Sanyo Eneloop AA batteries, see http://www.google.com/products?q=Sanyo+Eneloop+AA+batteries&hl=en&scoring=p, which are NiMH cells with low self-discharge (i.e. hold their charge for over 6 months) and are free of the memory effects and internal self-shorting problems of NiCad cells.

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A single razor blade should do the job, though the blade will now be largely ruined for any further use.

Next carefully flatten the tabs (will be a little deformed by the spot weld break strategy).

Next carefully tin both the tabs and the ends of the new NiMH cells with a small amount of solder.

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1 Answer

It is not melting the solder. do you have to use flux, like sweating copper? If so, can I use the same kind of flux for this application?


No flux, just make sure the element is heating up enough.
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If you do this last step. It is critical you Re-tin the tip.
Of course the tip must get hot enough to melt the solder.
If it still does not, I would suspect the batteries.
Good luck!
Hope this helps!

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