[sdiy] Transition to Lead-Free Hand Soldering

Mike Bryant mbryant at futurehorizons.com
Sat Aug 21 21:51:57 CEST 2021

Yes this is the problem with lead-free solders - there are so many incantations.
The ones with silver and just a little copper are fine.  But if there's even traces of anything else do not mix with leaded

It was much easier in the old Multicore 60/40 days :-)

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Ingo Debus via Synth-diy
Sent: 21 August 2021 20:47
To: Randy Dawson via Synth-diy
Subject: Re: [sdiy] Transition to Lead-Free Hand Soldering

> Am 20.08.2021 um 22:24 schrieb Tom Bugs via Synth-diy <synth-diy at synth-diy.org>:
> As far as I'm aware it is the other way around to what Jay says --- lead-free solder should not be used on leaded boards, but leaded solder is fine on either.
> As others have noted, do not use lead-free solder for repairs on old leaded equipment.

As I understand it, the problem with mixing leaded and lead-free solder is that some lead-free solder types contain metals (was that Bismuth?) that form an alloy with lead that has a very low melting point giving unreliable solder joints. As long as the lead-free solder contains only metals that are present in leaded solder too, everything should be fine. Can anyone confirm that?

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