Michael,

QUESTION: at "normal" soldering iron temperatures, what happens when you

melt a eutectic solder preform (p/o clip lead) together with hi-temp, 90

to 94% Sn (bal=Pb) solder?
Will the two solders alloy, or just form a mixture? Please provide as
metallurgically correct an answer as possible.

Generally speaking, they will alloy. Issues that may impact the result
are things like:
melt (mixing) time
thermal (convection) gradients
flux activity
presence of oxides
presence of copper (intermetallics) from previous reflow cycles

Andy Magee
Flex Guru - Consulting
[log in to unmask]
(937) 435-3629


M.S.—Metallurgy—3.3 GPA—Univ. of Connecticut—1988
B.S.—Mechanical Engineering/Materials Engineering Dual Degree
Cum Laude—3.3 G.P.A—Univ. of Connecticut—1979
AESF, ASM, MRS, ASME

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