From: Sean Breheny <shb7@cornell.edu>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Wed, 17 Jun 2020 12:41:49 -0700
Subject: Re: [OT] soldering mild steel sheet, galvanic corrosion?
Thread-Topic: [OT] soldering mild steel sheet, galvanic corrosion?
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The behavior you mention is characteristic of all non-eutectic mixtures.
They have two "melting points" - a solidus point and a liquidus point. The
properties of the semi-molten mixture in-between those two points is quite
strange and typically some minimum force is needed to cause flow (unlike a
liquid), but there is no elastic region (unlike a solid).

Sean


On Wed, Jun 17, 2020 at 10:03 AM Bob Blick <bobblick@outlook.com> wrote:

> Interestingly, though, solder used for plumbing, sheet metal and other
> large mechanical things like stained glass is rarely 60/40 like electroni=
c
> solder. The difference between it and 50/50 when it comes to workability =
is
> dramatic. 60/40 solder is harder to use in those applications because the
> whole workpiece melts at once, whereas with 50/50 you can work a section
> and have it fluid or slightly plastic, right next to an area that is stil=
l
> solid. There is a certain hysteresis to it that makes it more desirable i=
n
> that application.
>
> Best regards, Bob
>
> ________________________________________
> From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of Sean
> Breheny
> Sent: Tuesday, June 16, 2020 10:03 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [OT] soldering mild steel sheet, galvanic corrosion?
>
> Hi Jason,
>
> On Tue, Jun 16, 2020 at 5:25 PM Allen Mulvey  wrote:
>
> > Most of his solder was 60%
> > lead and 40% tin. I used to borrow it for electronic projects.
> >
>
> Is that a typo? The eutectic point is at 60% tin, 40% lead (typical
> electronics solder).
>
> Sean
>
>
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