Ping Don Foreman - Silver Solder Guru if ever there was one . . . .
Don, You want to jump in here? I've bombed out trying to differentiate
strength claims among various silver solder vendors.
Bob Swinney
"Leon Fisk" wrote in message
news
"Leon Fisk" wrote in message
. ..
On Thu, 2 Mar 2006 22:51:16 -0600, "Robert Swinney"
wrote:
Leon sez:
" I don't want to get into a ****ing contest here, but I can't
find where this has a true tensile strength of around 14,000
lbs."
Take a look at the tech spec sheet:
www.jwharris.com/images/pdf2/SB.pdf
Bob Swinney
"Leon Fisk" wrote in message
m...
On Thu, 2 Mar 2006 09:03:04 -0600, "Robert Swinney"
wrote:
It probably flows around 500 - 600 degrees. The "coolest" flowing
silver-bearing solder I am familiar with is 96% Tin, 4% Silver. It
flows
at
around 430 degrees F. Harris Stay Bright is one commercial version.
Radio
shack has a silver-bearing solder coiled up in a tiny tube (at an
outrageous
per-lb price), also of 96 - 4 formulation. Silver-bearing solders
are
best
fluxed with killed hydrochloric acid in paste or liquid form; such as
Harris
Stay Clean. 96-4 has tensile strength of around 14,000 lbs, which
should
be
enough for a die filer. The low temps of 96 - 4 make it an attractive
choice when warping is a concern.
Bob Swinney
This Matweb link shows it as having 4640 psi (they don't
list the tensile for 96Sn/4Ag):
http://www.matweb.com/search/Specifi...bassnum=MLSS94
Other references I have show the various versions
(~95Sn/~5Ag) in the same area. Harris's web site has
"Tensile Strength (Cu to Cu) 14,000 psi" listed, but I read
this as meaning: soldering copper-to-copper. Grant won't be
soldering Cu-to-Cu in this application.
Here is an interesting chart I found a while back:
http://www.indium.com/products/alloy...loy_number.pdf
from this page:
http://www.indium.com/products/alloychart.php
I don't know, maybe I'm missing something here. That's why
I'm curious/asking the question...
--
Did you really read my whole post? What Harris has on their
site doesn't match other sites for the same material
composition. Look at how HARRIS STAY BRITE #8 SILVER BEARING
SOLDER puts it:
http://www.jwharris.com/images/pdf2/SB8.pdf
"Tensile Strength ( Cu to Cu) 14,000 psi
Shear Strength ( Cu to Cu) 10,600 psi"
Which is worded differently than your link to
HARRIS STAY BRITE SILVER BEARING SOLDER at:
http://www.jwharris.com/images/pdf2/SB.pdf
Other than one has maybe 2% more silver and proportionately
less tin they are the same.
I find it odd that neither Matweb nor Indium show anywhere
near this kind of tensile strength for the same values.
Indium shows their ID# 121 as 96.5%Sn/3.5% Ag as having a
tensile of 5800 psi and shear of 2700 psi. These are similar
to those at Matweb. It seems strange to me that the values
are so far apart for the same basic compositions (shrug).
On Fri, 3 Mar 2006 14:31:16 -0600, "Robert Swinney"
wrote:
Leon,
The Matweb link showed a product that had other constituents in it rather
than just tin and silver. I suppose that had something to do with the
difference in tensile strengths.
Hi Bob,
The other constituents are common at Matweb. If you notice
they are in trivial amounts. There will always be impurities
involved, it just happens to be listed here.
Take a look at the Indium link:
http://www.indium.com/products/alloy...loy_number.pdf
Their product number 121.
It is almost identical to the Matweb version and Harris
Silver solder. It is much closer to the values that Matweb
has. Indium lists other flavors too, not all of them have
values for tensile strength though. But the ones that do
have with similar compositions are no where near 14,000 psi.
I get the impression that Harris is claiming a tensile
strength of 14,000 psi when used for copper-to-copper
soldering. If that is so, what would it be for say
stainless-to-stainless, or steel-to-steel? At what thickness
of filler material? A thick solder job with poor
surface-to-surface contact would have a much lower tensile
strength maybe?
Maybe Matweb does have a clue:
"32 MPa 4640 psi
Cast solder aged 14 days. Typical Cu joint is 97 MPa."
It appears that they measure the solder itself at 4640 psi
and a typical copper joint at 14068.69 psi(converted from
97MPa).
See once again:
http://www.matweb.com/search/Specifi...bassnum=MLSS94
So what would it be for Grant's application, which sure
isn't a copper joint...
More food for thought, Matweb shows this for good old
63Sn/37Pb:
"Tensile Strength, Ultimate 52 MPa 7540 psi
Cast solder. Typical Cu joint is 200 MPa."
Which would convert to 29,000 psi copper joint typical.
See:
http://www.matweb.com/search/Specifi...bassnum=MLSS63
Interesting stuff, I just wish I would have known about all
these different flavors of solder years ago when I could
have put them to good use. Ain't no fun getting old...
--
Leon Fisk
Grand Rapids MI/Zone 5b
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