[sdiy] stupid solder

[Takuya KATAYAMA]

Hello Roman and the List!

Here are my answers;

1)Matt surface of solder point indicates its uncertainly melting and
bonding.

2)The mat surface is made of small (like powder) crystals of Ag.
Ag melts higher temperature than that of Sn, so Ag first come out as
crystal.

3)Matt surface of lead-free solder is not always bad.
The surface of good soldering with lead-free solder is oftn not so
shine, because its compounds come out of the surface.

4)As answers 2&3, it is not certain which is sooner.

I think lead-free solder is very difficult.
Because its high melting point and stickiness.
===================================================================
Takuya "PATA" Katayama at Muse Music Synthesizer Lab., Japan

Roman.Sowa at upc.com.pl wrote:

>Hi, I thought I should ask it here:
>
>I have a lead-free solder alloy (Sn96%) that is real pain to use.
>It melts in higher temperature than leaded one, and it's almost
>impossible to achieve shining mirror finish with it. After many
>solder points I came to not bad results, i.e. solder surface is
>not matt, but it's not so shiny as Sn60 either.
>
>Now my question goes - how bad is it when solder joint surface
>is matt, i.e. oxidized? Or is it those few % of silver that
>come out to the surface and make it look matt? Does it influence
>anything? Will it break sooner than shining one?
>
>well, that's 4 questions, not one :)
>
>Roman
>
>
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