Solder-blobbing 14500 and 18650 cells with Bi50Sn18Pb32 (Rose's Metal)

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Philaphlous
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I use a dremel with a “polishing” bit to rough up the surface, like this one: https://www.homedepot.com/p/Dremel-Bullet-Shaped-Rubber-Rotary-Tool-Poli...
It makes for perfect adhesion of the solder and it takes way less time to heat the batteries. The solder literally just flows right into the roughed up surface made by the tool… takes more prep but ensures a good bond too!

Barkuti
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Polishing the surface uncovers unoxidized metal Philaphlous, allowing the solder and in this case the steel to fuse together.

As you can see in my video I use an aggressive flux which just straight does the job:

 

 

Unfortunately, I believe this stuff is discontinued, though of course there are other flux manufacturers. 

 

Cheers fellows 

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Lightbringer
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Yeah, I just scuff the surface with 1000grit. Never ever ever had any problems soldering to it. No cold joints, no problems whatsoever.

I use this blue organic flux (was given a half-pint from a gallon-jug where I worked), and just wetting the surface does the job. Scuff, wet, apply molten blob. Flux sizzles away while the blob form-fits to the surface, once it wets and spreads out, keep holding it a few more seconds, then pull away the iron. It cools and is a perfectly-stuck blob.

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bcm00re
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Anyone tried this:
https://www.ebay.com/itm/Kester-solder-wire-Sn43-Pb43-Bi14-solid-core-lo...

I confirmed it has a melting point of about 150 C — so much lower than typical solder.

Barkuti
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bcm00re wrote:
Anyone tried this:
https://www.ebay.com/itm/Kester-solder-wire-Sn43-Pb43-Bi14-solid-core-lo...

I confirmed it has a melting point of about 150 C …

 The ad specifies a 144 - 163 °C solidus - liquidus “mushy” state range. Non eutectic alloy.

Never heard of it. In that temperature range I would probably try Sn42Bi58, which is also eutectic.

P.S.: Some cheap links for steel flux here and there.

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bcm00re
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Barkuti wrote:

P.S.: Some cheap links for steel flux here and there.


On the one with 2 bottles, do both have the same thing in them (with one just being larger)? The listing is not clear at all to me.
Barkuti
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Yeah it's also not very clear to me bcm00re. Made another search and found this among others:

¯\_(ツ)_/¯

 

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