Both are the same in that they are a filler metal joining two surfaces that
make intermetallics with metals being joined. Use a flux or atmosphere to
prepare surfaces etc. So there is really a continuum of alloys in differing
families (according to major constituent) with different properties from
around 100C up to as hot as you like.
Commonly though people make a distinction or at least find it convenient to
do so between solders and brazes based on temperature/alloy type as follows.
Solders/soft solders are based on soft metals like Sn and Pb to give melting
points from around 300-330C down to about say 100C (Alloys with MP below
arbitrary 100C are usually thought of a fusible alloys. They melt but don't
make intermetallics with basis metals too well or at all)
Hard solders/brazes/silver solders/ German solders (according to your brand
of English) are based on harder metals like Ag and have melting points from
300 330C up.
The flux chemistry also changes with the temperature, around 300C is also
the edge of the performance envelope for most soft solder fluxes
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric CHRISTISON
Sent: Monday, October 13, 2008 2:50 AM
To: [log in to unmask]
Subject: Re: [TN] Need soldering advice ASAP No II - tangential question..
Interesting post Mike,
At the risk of going a little off topic I've never quite understood the
distinction between a solder and a braze. Is there a clear cut difference in
the metallurgy of the different joints?
Regards,
> The usual wisdom on soft solders is that they aren't very strong, so
the
> more ductile the alloy the less likely it is to break. This
conventional
> wisdom doesn't really apply to Au/Sn as it is more like a braze with
tensile
> and sheer about 8x 10x lead alloys.
>
--
Eric Christison Msc
Mechanical Engineer
Consumer & Micro group
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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