Re: About the cable used in oscilloscope probes

Don Black <donald_black@...>

I think that's the same type of process as the ultrasonic tinning in that it lifts off the oxide layer. The ultrasonic cleaning probably cleans the entire surface better whereas the rubbing may miss spots. One's better for production, the other fine for one off's. I think any flux would have to be carefully selected to ensure no long term corrosion. The Wharfedale speakers are still going strong after 40+ years. With mechanical cleaning in the molten solder it shouldn't need any flux.

Don Black.

On 13-Jan-14 11:48 AM, wyzkydd2358@... wrote:

Aluminum can be easily soldered using regular old leaded solder using the right trick. You don't even need any special flux. Take your soldering iron and dab some fresh solder on so there's a ball of molten solder hanging from the tip and apply it to the aluminum to be soldered. Using the iron's tip lightly abrade the aluminum surface with a scraping motion, and the oxide layer will be wiped right off, allowing the solder to properly adhere.

On Jan 12, 2014 6:08 PM, David wrote:

I assume then that the aluminum tabs on can capacitors are tinned in this way. I
always wondered how they did that.

I have also seen copper plated aluminum wire.

On Mon, 13 Jan 2014 10:34:38 +1100, you wrote:

>I don't know what is used now but in his sixties books GA Briggs of
>Wharfedale speaker fame mentions they tinned the aluminium voice coil
>wire using an ultrasonic solder pot. The ultrasonic energy causes
>cavitation that strips off the surface oxidation under the solder
>surface, excluding the air.
>I think it would likely work with nichrome too.
>Don Black.
>On 13-Jan-14 4:16 AM, David wrote:
>> Difficult to solder metals can often be handled by cleaning and
>> etching with
>> hydrochloric acid and then depositing copper via electrolysis and an
>> easily
>> acquired solution of copper sulphate or copper nitrate. I would worry
>> about
>> strain relief of the wire at the edge of the solder joint though.
>> 12 Jan 2014 09:01:51 -0800, you wrote:
>> > . . .
>> >
>> > BTW, as the center conductor is nichrome, you can't solder it. The
>> connections at the terminations are usually crimped on the wire.
>> >
>> > - Steve

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