chaz Posted January 13, 2022 Report Share Posted January 13, 2022 Hi folks, I'm after some flux to solder some stainless steel braided wire. The wires are coming from my Lithium Polymer batteries and need to be soldered to gold plated connectors. I've been told to get "Flux No.71". But I can only find that in big bottles, when all I need is around 25 ml. Does anyone know where I can get a small amount, (Bar China) or does anyone have any I could buy? Failing all the above does anyone know of another flux that would work?? (I've tried cheapo flux, Fry fluxite, and LA.CO flux) I've used plenty of heat and a large solder tip for quick heat transfer, but I'm still struggling to get a consistent finish.... 😖 Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted January 13, 2022 Report Share Posted January 13, 2022 For soft solder try Harris's "Stayclean". https://www.cupalloys.co.uk/store/Stay-Clean-Flux-125ml-p276411655 I've read that Jenolite de-rust treatment works as it contains phosphoric acid - not used myself. The traditional way is zinc dissolved in hydrochloric acid until no more will dissolve - this is quite aggressive and don't breath the fumes during soldering. I suggest plumbers solder rather than electronics multicore type solders. Extremely clean and dry first. Quote Link to comment Share on other sites More sharing options...
chaz Posted January 13, 2022 Author Report Share Posted January 13, 2022 Cheers PopsBengo, I'll do some research. I'll give the hydrochloric acid a miss. Although "Flux No. 71" apparently contain hydrochloric acid, along with other acids.... Cheers. Quote Link to comment Share on other sites More sharing options...
Richiew Posted January 14, 2022 Report Share Posted January 14, 2022 Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted January 14, 2022 Report Share Posted January 14, 2022 51 minutes ago, Richiew said: Have you tried this on stainless steel? Our sheetmetal workers used it for galv. and mild steel but it wasn't reliable for stainless. This is also recommended and not expensive https://soldersandfluxes.co.uk/p584/A8-Flux-for-Stainless-Steel.html Quote Link to comment Share on other sites More sharing options...
Richiew Posted January 14, 2022 Report Share Posted January 14, 2022 Never seen stainless braid , sure it’s not silver plated copper?? . We use fluxrite for every solder job here at an ex ICI plant but can sometimes struggle to get enough heat into the wires when using welding cables . Might have to use crimps on the braid then solder the copper to the gold bits . Solder with 5 core flux built in works well think it used to be called ERSIN Quote Link to comment Share on other sites More sharing options...
Richiew Posted January 14, 2022 Report Share Posted January 14, 2022 New makers are loctite branded as “multicore “ . Farnell have various types of sizes solder diameter that is . cheers Quote Link to comment Share on other sites More sharing options...
Richiew Posted January 14, 2022 Report Share Posted January 14, 2022 Stainless flux looks it could be a goer tho Quote Link to comment Share on other sites More sharing options...
chaz Posted January 19, 2022 Author Report Share Posted January 19, 2022 I ended up buying this. I just hope it works....... P 20 Soft Soldering Flux Paste 140g pot _ solder flux _ eBay.html Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted January 19, 2022 Report Share Posted January 19, 2022 1 hour ago, chaz said: I ended up buying this. I just hope it works....... P 20 Soft Soldering Flux Paste 140g pot _ solder flux _ eBay.html 632.89 kB · 6 downloads Hope it works for you. If you know this please forgive me: Scuff up the stainless to brighten the surface. Don't forget any dampness, dirt or grease including finger grease will disrupt wetting-out of the solder. Try tinning the two surfaces (especially the stainless) first. Quote Link to comment Share on other sites More sharing options...
Re-Pete Posted January 19, 2022 Report Share Posted January 19, 2022 https://soldersandfluxes.co.uk/p584/A8-Flux-for-Stainless-Steel.html Worth a shot for £6........? (plus p/p...) Pete Quote Link to comment Share on other sites More sharing options...
chaz Posted March 31, 2022 Author Report Share Posted March 31, 2022 Thanks all now sorted. Quote Link to comment Share on other sites More sharing options...
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