Hi Joshua - I think that your customer (the company?) is mixing apples and
oranges! Conventional terminology is that soldering is done below 800 F and
brazing/welding is done above 800 F (an AWS definition). The fluxes and
base materials used in brazing/welding have very high activity levels in
comparison to fluxes typically used in soldering processes. The old
MIL-S-6872 or DOD-STD-1866 were both specifications that covered
non-electrical, mechanical type solder joints. There may be portions of
these specifications that you find helpful but remember that there are
thousands of mechanical solder joints made everyday that have only one
requirement: the solder joint is continuous, nearly void free (or void free
if there is a concern about being total sealed) and meets the reliability
neets to withstand the rigors of the use environment. I recommend that you
get with your customer and discuss where/why the concern of corrosion
attack. A review of the soldering process and flux used may eliminate the
customer's concerns. Good Luck.

Dave Hillman
Rockwell Collins
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Joshua Forrester <[log in to unmask]> on 01/11/99 03:00:59 PM

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Subject:  [TN] Soldering Question




I am attempting to find some info or a standard that deals specifically
with the soldering of purely mechanical parts,  ( a tube used to transfer
hydraulic fluids in an electro-mechanical assembly soldered to another
transfer tube) , the company thinks that the small amount of acid from the
flux core solder is over a period of time weakening the "weld" and
resulting in cracks or fractures.  Can anyone help me with this one?
Thanks in advance.

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